physics.unipune.ac.inphysics.unipune.ac.in/~rmc/2020/RMC_2020_Abstract_Book.pdf · RMC-2020 is celebrating the 150th anniversary of the periodic table. The Periodic Table of Chemical

abstract book

“Novel Materials for a sustainable future”

Organized By,Research Students,Department of Physics,

Savitribai Phule Pune University,Pune - 411007

26TH RAMAN MEMORIAL CONFERENCE

14th-15th FEBRUARY 2020

abstract book

“Novel Materials for a sustainable future”

Organized By,Research Students,Department of Physics,

Savitribai Phule Pune University,Pune - 411007

26TH RAMAN MEMORIAL CONFERENCE

14th-15th FEBRUARY 2020

Raman Memorial Conference - 2020

OUR

SPONSORS





Prof. (Dr.) Nitin R. Karmalkar (Vice Chancellor)

Message

It gives me immense pleasure to welcome all the delegates for 26th

National Raman

Memorial Conference (RMC 2020) organized by the Department of Physics, Savitribai Phule

Pune University, Pune on 14th

and 15th

February 2020.

This conference will provide a platform for researchers to get networked and

exchange ideas. I am sure this conference will be a great source of information to the

academicians, scholars, and industrialists. Researchers, who would have done a good deal of

thinking about their idea, will come forward and share their thoughts with various invitees,

delegates and faculties.

I am sure all the delegates will enjoy the beautiful and scenic campus of Savitribai

Phule Pune University as well as Pune city.

I highly appreciate the immense efforts taken by the organizing committee to organize

this RMC 2020 conference. I congratulate the organizing committee and wish them and all

the participants’ success for this conference and hope that it turns out to be a successful event

encouraging more profound work on the theme.

Prof. (Dr.) Nitin R. Karmalkar


Prof. (Dr.) S. W. Gosavi (HOD, Dept of Physics SPPU)

Message

It is my great pleasure and privilege to write this message for the 26th

Raman

Memorial Conference 2020 (RMC - 2020). Department of Physics is one of the leading

physics departments in the country. It has been recognized as Center for Advanced Studies in

Material Science and Condense Matter Physics and is being funded for the last 30 year by the

University Grant Commission (UGC), Department of Science and Technology (DST),

government of India has been supporting the Department under its FIST program since the

year 2000. Faculty members in the Departments always strive to achieve excellence in

teaching and research and we publish approximately 100 research papers annually in journals

of international repute.

The most special feature of this conference is that it is ‘of the students’, ‘by the

students’ and ‘for the students’. Hence it is very important for the students not only to from

the point of view of gaining knowledge but also for the getting trained to take up

administrative responsibilities. I am sure that like every year, even this year, the conference

will provide a distinctive opportunity to delegates to exchange ideas with the renowned

plenary speakers about the developments in research areas and have a fruitful academic

interaction with fellow participants. I welcome all the speakers and participants to Pune and

wish this conference grand success. I am sure it will prove to be beneficial to all the

participants.

Prof. S. W. Gosavi


From the Organizing Committee

The Organizing Committee has the greatest pleasure to invite you all for the 26rd

Raman

Memorial Conference. This annual conference is organized by the research students of the

Department of Physics, Savitribai Phule Pune University. We are holding this torch handed

over to us by our seniors with the same purpose of encouraging young researchers to present

their work and to interact with eminent scientists.

The aim of the conference, 'by the students, for the students’, gives research students a

platform for scientific presentation, discussion with eminent scientist and also an opportunity

to develop management skills. With increasing participation from various research institutes

and universities from across the country, the conference has come a long way from its

humble beginnings.

The organizing committee hopes that the researchers attending the conference would

be excited and motivated to explore various branches of physics and their applications for the

society. We are thankful to all the sponsors (institutes, industries) for their whole hearted

support. We would also like to thank our colleagues, Professors, department staff and all

those from Savitribai Phule Pune University who have helped us in various capacities. Finally

we cordially welcome you all for RMC 2020. Hope you enjoy the conference as much as we

have strived to make it interesting and fruitful for you.

Organising Committee,

Raman Memorial Conference 2020


Conference Theme

Novel Materials for a sustainable future

From the development of the wheel to batteries, many advance technologies have been

adopted and have left an impact on human history. In search of new materials in 1985 a new

era started with the discovery of ‘fullerenes’ and research began on smaller materials that

have similar properties and that could replace conventional bulk materials. With advances in

material science, physics, chemistry, engineering, biology, pharmacy and medicine, lifestyle

on earth has drastically changed. The major challenge for researchers is to create new

technology and materials that can help shape the world towards a sustainable future.

RMC-2020 is celebrating the 150th

anniversary of the periodic table. The Periodic Table of

Chemical Elements is one of the most significant achievements in science, capturing the

essence not only of chemistry, but also of physics, medicine, earth sciences and biology. 1869

is considered as the year of discovery of the Periodic System, and Dmitri Mendeleev was a

major discoverer. By 1860 only 63 elements had been discovered and now total 118 elements

can be easily arranged in the table based on the increasing order of their atomic numbers.

The scope of RMC 2020 “Novel Materials for a sustainable future” is to provide a

platform for presenting the state-of-the-art knowledge of research on properties, novel

synthesis techniques, characterization and applications of materials into electronic, optical, or

electrochemical devices, as well as to cover the current challenges related to them.


Local Organising Committee

Mr. Ashish Waghmare

Ms. Chaitali Jagtap

Ms. Dipmala Sali

Mr. Kishor Gavhane

Mr. Nilesh Patil

Mr. Pankaj Bhujbal

Mr. Sachin Desarada

Mr. Theodore Selwyn G

Mr. Vishal Kadam

Table of Contents

ID No.

Author

And

Title of Paper

Keynote

B. L. V. Prasad

Molecular tools for the manipulation of size, surface chemistry and assemblies of

metal nanoparticles

IT-01

Prasenjit Ghosh

Understanding and design of materials using computers

IT-02

S.V.Moharil

Discovering Materials

IT-03

Premkumar Senguttuvan

Towards High Rate & High Capacity NASICON Cathodes for Na-ion Batteries

IT-04

R. Chelakkot

Active matter and collective ordering

IT-05

D. Bhattacharyya

X-ray absorption spectroscopy with Indus-2 SRS

IT-06

Vasant Sathe

Scientific Facilities at UGC-DAE CSR, Indore centre

TP-01

B. Moses Abraham

Computational Study of Hydrogen Bonded Energetic Materials

TP-02

Hari R. Pawar

Catalytic Activity of Ru-Based Nancomposites as Heterogeneous Catalyst Towards

Organic Transformations

TP-03

Suyog A. Raut

Thermal Plasma Synthesis of Magnetic Nanoparticles for Ferrofluid Based

Applications

TP-04

Bhavna C Keswani

Studies on Magnetoelectric Properties of Lead-free Piezoelectric and

Magnetostrictive Cobalt Ferrite Composite Multiferroics

TP-05

Sandip M. Wadhai

Aqueous Droplet Manipulation by Electrowetting on Dielectrics

OP-1

Akshay N. Vyas

Growth of Palladium Nanoparticles and Their Application in Ethanol

Electrooxidation

OP-2

Pradeep S. Thakur

The effect of Dzyaloshinskii-Moriya interaction on entanglement in a transverse

magnetic field spin -1/2 XXZ chain

OP-3

Imran Shaikh

Investigation of SERS activity of industrial pollutant on thermally reduced spin

coated Ag nanoparticles

OP-4

V. S. Ghemud

Structural and Optical properties of Cu doped SnO2: A computational study.

OP-5

P. S. Kadhane

Studies on structural and ferroelectric properties of lead-free

Ba0.97Ca0.03Ti1-xSnxO3electroceramics

OP-6

Bhakti M. Kshirsagar

First principle investigations of CsSnX3 (X = Cl, Br, I) quantum dots

OP-7

Aniruddha Kibey

Edge Distortion in Zigzag SnSe Nanoribbons

OP-8

Devidas I. Halge

Visible Light Photo-detector using Nano-crystalline Cadmium Sulfide

Thin Films

OP-9

Sameer Salunkhe

Discovery of Radio-relic and the diffuse emission sources in merging and non-

merging galaxy clusters

OP-10

Pooja M. Khanzode

Infrared Photo-detector using Nano-crystalline Lead Sulfide Thin Film on Paper

OP-11

Ambadas B. Phatangare

Study on advance oxidation processes for the degradation of water pollutants using 6

MeV electron irradiation

OP-12

Laxman Tatikondewar

Ultra thin excitonic solar cells from transition metal dichalcogenides

OP-13

G. T. Bholane

Measurement of flux-weighted average Cross-Section of (, ') and (,n) Nuclear

Reactions in 179

Hf and 180

Hf using bremsstrahlung radiation

OP-14

Preeti Kulkarni

Photoluminescence and Thermoluminescence studies of β-NaGdF4: Tb3+

phosphor

crystals

OP-15

Mangesh A. Desai

Towards achieving excellent supercapacitance from K and Na ion preinserted MnO2

nanostructures

OP-16

Manish S Hiray

Non-Thermal Synchrotron Radio Emission from Large Scale Structures of Universe

and its Detection Techniques

OP-17

Ravi V Ingle

Optical and Electronic properties of different Nanosize particles of cadmium sulfide

OP-18

Avinash N. Parde

Estimation of Surface Particulate Matter (PM2.5 and PM10) Mass Concentration from

the Ceilometer Backscattered Profiles

OP-19

Kishor H. Gavhane

Tm-Tstop Analysis and Dosimetric Properties of Ce Doped BaB4O7 Phosphor

OP-20

J.D.Desai

Civilizations and Materials Use: Historical Perspective

OP-21

Supriya E. More

Effect of ECR plasma properties on UHMWPE polymer surface suitable for

biomedical application

OP-22

Dhanashri Gaikwad

Electrically Conductive Carbon-based Wearable Sensors for Artificial Human-

Machine Intelligence Systems

OP-23

S. A. Kamble

Effect of plasma parameters on the morphology and electron emission properties of

nanocrystalline LaB6 particles.

OP-24

Md. Samsuzzaman

Tuning the self-organization of confined active particles by the steepness of the trap

OP-25

Mohammed Abdul Haque

Photoluminescence intermittency and time dependent spectral blue shift in individual

CsPbBr3 quantum dots

OP-26

Shobha Birajdar

Ammonia sensor based on modified V2O5 nanostructures

OP-27

Rahul A. Aher

Temperature Dependent Raman-active Optical Phonons driven low thermal

conductivity of PbBi2Se4

OP-28

Sneha Mahalunkar

FA–Cur@Au-PVP Nanoprobe Mimicking Peroxidase Activity: A Step towards

Developing Colorimeteric Biosensor

OP-29

Sutapa Chattopadhyay

Possibility of topological properties in 2D cadmium chalcogenide (CdX, X = S, Se,

and Te) buckled honeycomb monolayer on substitutional doping

PP-01

Aafaq A. Tantray

Phosphonium Based Ionic Liquid Catalysed One Pot Synthesis of Dihydropyrimidines

PP-02

Abhijit T. Supekar

Factors that Influence the Performance of Cadmium Sulphide

Sensitized Zinc Oxide Photoanode for Solar Cell application

PP-03

Amey Rodge

Radiation Detectors.

PP-04

Amruta A Lohar

Size dependent Stokes nhift in CsPbBr3 perovskites nanocrystals

PP-05

Anuradha Beedkar

Effect of Mn3O4 Nanoparticles on neuroblastoma cell (SHSY5Y)

PP-06

Aparna Shinde

Polarized emission in CsPbBr3 quantum dots

PP-07

Aparna Ukarande

Influence of the bath temperature on the properties of CdTe thin films

PP-08

Aqsa Shaikh

Ag nanoparticles grown on different substrates by SILAR method for SERS

application

PP-09

Arya Ajeev

Electrically Conductive Carbon based Inks for Developing the Wearable Smart

Sensors

PP-10

Ashik Ali

An overview of NTC Thermistor For Temperature Sensing Application

PP-11

Ashwini Karale

Visible light Photocatalyst for water splitting, Dye degradation and self-cleaning

application

PP-12

Avinash R. Kachere

Hydrothermal synthesis and characterization of Molybdenum disulfide

(MoS2) nanoflowers

PP-13

Bharati Wakchaure

Flexible POLYANILINE (PANI) based 3 x 3 Active Matrix for Electrochromic

Display Applications

PP-14

Bikram Prasad

Optical effect of cadmium sulphide sensitized zirconia films for application in solar

cells

PP-15

Chavan Neha Ashok

Studies on synthesis of spray deposited iron tungstate (FeWO4) thin films and their

characterization for memristive properties

PP-16

Devashri Pravin Upasani

Exploring the potential of the slot-die technique for single step preparation of

Perovskite-Fullerene BHJ thin film: theoretical simulation of the Surfactant Free

Microemulsion Scheme

PP-17

Devyani Kamble

Freshening Episodes In The North Bay Of Bengal

PP-18

Dibyendu Kuiri

Effect of impurities on Vortex dynamics in two-component BEC

PP-19

Gauri Govardhan Bisen

Amendment of bulk heterojunction morphology by ultrasonic spray coating

PP-20

Gayatri Dipak Mane

Comparison of Different Qualities of Honey of Different Companies

PP-21

Hari Pawar, Pranay Sakhare, Sagar Yewale, Saksham Nale

Visible Light Photocatalysis Towards Synthesis of Bioactive Benzazoles

PP-22

Harishchand Nishad

Effect of crystal structure modification on the electrochemical charge storage of WO3

nanoplates

PP-23

Harshada Anand Barve

Theoretical Study of Structural, Magnetic and Electrical properties of Undoped and

Doped Cadmium Telluride Nanotube

PP-24

Hemlata Bhandari

Current Dynamics In Single Particle Quantum Walk On A One

Dimensional Lattice.

PP-25

Indrajit Shriwastav

Heterogeneous Thin film FTO/TiO2/Al2O3/N2-doped TiO2 as an application for Photo-

Electro-Chemical (PEC) Cells and solar absorbers.

PP-26

Jyoti Jadhav

Glucose Detection Using SILAR Grown Nickel Nanoparticles

PP-27

S. D. Aher

Synthesis, Characterization and Application of ZnO by Mechanochemical Method

PP-28

Kajal G. Hase

Synthesis of 2 - Substituted Benzimidazoles Catalyzed by ZnO Nanoparticles

PP-29

Kalyani Dhabekar

Dielectric and magnetic properties of CoFe2O4-BaFe12O19 nanocomposites

PP-30

Kanchan Berad

Phase transition study of BiVO4 Photocatalyst

PP-31

Karan R.Takkhi

Molecules can explain the expansion of the Universe

PP-32

Kaustubh Sawant

SILAR synthesised of MnO2 nanoflowers and their supercapacitive performance

PP-33

Ketan S. Navale

Eu Activated MgB4O7 Phosphor for Thermoluminescence Radiation Dosimetry

PP-34

Komal B. Wakchaure

Solution of the Schrödinger Equation for the Simple Harmonic Oscillator

using Finite Difference Method.

PP-35

Komal R. Bhambe

Synthesis, growth optimization and characterization of Re-Te thin films

PP-36

M. S. Sonawane

Chemically Deposited Nanocrystalline Nickel Sulphide Thin Films for

Electrochemical Supercapacitor Application

PP-37

Mahesh Godse

Photo-electrochemical Properties of SILAR Synthesized ZnO Thin Films

PP-38

Mrudul Modak

Selective Dissolution of Inter-Diffused P-N Junction to Enhance Charge Carrier

Mobility

PP-39

Mulla Heena Shabbir

Electrochemical Performance of 3-D Hierarchical Magnetite Tremella

PP-40

Narendra Mohanrao Shirsath

Diurnal Variations of INSAT – 3D Satellite Measured Brightness Temperatures

Associated with Intensity Changes of Tropical Cyclones over North Indian Ocean

PP-41

Neeta Bisht

Structural and Optical Properties of Rare Earth Doped GaN Monolayer:

Density Functional Study

PP-42

Nitin R. Rode

Brønsted Amino Acid Ionic Liquid ProH2PO4: A Highly Efficient Reusable Green

Catalyst for Neat Synthesis of Amidoalkyl Naphthols

PP-43

Niyamat I. Beedri

Effect of Nb2O5 Blocking layer on ZnO Photoanode based

Dye Sensitized Solar Cells

PP-44

Pooja Deshpande

Effect of Cerium Oxide Nanoparticles on Seed Germination of Pulses

PP-45

Pradyumna P. Waifalkar

Solvothermal Synthesis of Monodispersed Superparamagnetic Magnetite Nanoclusters

for targeted drug delivery

PP-46

Prashant B. Kharat

Oleic Acid Coated Hydrophilic Nano-Scale Zinc Ferrite for Magnetic Hyperthermia

Study towards Biomedical Applications

PP-47

Prashant M. Kakade

An environmentally friendly and efficient route for synthesis of rod shaped GO/MgO2

nanocomposite

PP-48

Pravin Walave

Development of Schottky junction type betavoltaic nuclear battery using SiC

nanowires

PP-49

Priyanka M

ZnS Photoanode for DSSCs via Chemical Route

PP-50

Priyanka P. Dani

Synthesis and characterization of ZnO-GO nanocomposites in the view of solar cell

application

PP-51

Sachin Desarada

Impact of Post-Annealing Process onto RF sputtered CuInGaSe2 Thin film

PP-52

Sadigale Shubhangi Tukaram

Supercapacitive Performance of Electron Irradiated Polyaniline Thin Films

PP-53

Saima G. Sayyed

Electrochemically deposited Copper oxide thin films for Supercapacitor Application

PP-54

Sakshi Patil

Synthesis and Characterization of High Tc Superconducting- BSCCO and YBCO

samples

PP-55

Sandhya Singh

Effect of simulated microgravity on cell surface properties of Staphylococcus aureus

bacteria

PP-56

Sanket Rahul Bhiogade

Monsoon low-level wind characteristics over a high altitude site, Mahabaleshwar,

using high-resolution radiosonde observations

PP-57

Shaik Babujani

Influence of selenisation temperature on the growth of (Cu,Ag)0.5InSe2 thin films by

two – stage process

PP-58

Shantanand M. Mathapati

One step multicomponent synthesis of N-Acyl-α-amino acid amide using recyclable &

eco-friendly solvent with trialkylamine as catalyst.

PP-59

Sharad Abasaheb Mahadik

Thionaphthoquinones as photosensitizers in ZnO based dye sensitized solar cells.

PP-60

Sheetal Malvankar

Role of cobalt doping on structural and optical properties of ZnO nanocrystals

PP-61

Shivani Tiwari

Computational Study on Corrosion Inhibitor Molecules on Copper Surface

PP-62

Shreya Patil

Flexible PEDOT:PSS based 3 x 3 Active Matrix for Electrochromic Display

Applications

PP-63

Shridhar Shirish Puranik

Synthesis of Copper Chromium Oxides (Cu-Cr-O) using thermal plasma route for

propellant application

PP-64

Siddharth S. Karkhanis

A Density Functional Study of Covalent Functionalisation of the metalliods on the

Electronic Transport Properties of the Graphene.

PP-65

Smita Yadav

Facile fabrication of TiO2/g-C3N4 composite photocatalyst with enhanced

photocatalytic dye degradation

PP-66

Sonal Pandit, Salunke Rajanigandha Chandulal

Hydrothermal synthesis and characterization of MoSe2 nanosheets

PP-67

Sparsha S Sawant Dessai

Preparation and characterization of CdTe thin films

PP-68

Suprabha S. Sahoo

Amino substituted Lawsone derivatives as photosensitizers for Dye Sensitized Solar

Cells

PP-69

Swapnil Doke

Sustained multiferroicity in liquid crystal induced by core/shell quantum dots

PP-70

Swati S. Gagare

Visible light induced BiVO4 photocatalyst for MB dye degradation

PP-71

T.L.Kumavat

Study of structural, electronic and magnetic properties of (Ni2O3)n cluster

PP-72

Tanvi T Naik

Preparation and characterization of CdSe thin films

PP-73

V. B. Shinde

Synthesis and characterization of NiO nanoparticles by Microwave irradiation

technique

PP-74

Venkat Punjabi

Tidal evolution of close-in exoplanets

PP-75

Vijay Ahire Karbhari

Synthesis of copper nanoparticles for the inclusion phenomenon with bovine serum

albumin and calixarene molecule

PP-76

Viraj Gujar

Establishment of the Hanbury Brown – Twiss and Mach - Zehnder Interferometers

and Measuring Ultra - low Power of Pulsed Laser Beam

PP-77

Yogeshri G. Bagekari

Study of Electrical Properties of Graphitic Carbon Nitride using Low Energy Ion

Irradiation Technique

PP-78

Yogita N. Chaudhari

Direct Synthesis of polymer: matal sulphide nanocomposite at different reaction

temperature to study optical properties for photovoltaic application

PP-79

Zahid S. Momin

Preparation of MWCNT-Pth-Ru/Pd Nano composite at Liquid-Liquid Interface

Reaction Technique

PP-80

Bharat Bade

Hot Injection Synthesis of Cu2FeSnS4 (CFTS) Nanocrystal for Energy Storage

Application

PP-81

Nikita B. Tathe

Investigation of the Structural, Morphology and Magnetic properties of Ni substituted

Co-ferrite

PP-82

Pranjali Yedewar

Study of AC and DC Voltage Electrowetting on Ferroelectric Polymer for Low

Voltage Applications

PP-83

Pratibha Shinde

MOF based ZnO Nanosheets for Photoelectrochemical Splitting of Water

PP-84

Sayed Abdul Saboor

Plasmon Sensitized Zinc Oxide Nanorods for Efficient Photoelectrochemical Splitting

of Water

PP-85

Tanuja Shinde

High k-dielectric Zirconia thin films by sol-gel technique for field effect transistors

PP-86

Yogesh V Hase

Effect of annealing temperature on structural and optical properties of rutile TiO2

nanoparticles

PP-87

Ebrima L Darboe

Zinc Oxide Nanostructures Sensitized with Plasmons for Efficient

Photoelectrochemical Splitting of Water

PP-88

Hemant Shirke

Study of Sputtered Multi-metallic Stacked Nanolayers effect on Cu2ZnSnS4 absorber

for solar cell applications

PP-89

Kalyani Tikote

Polycrystalline and stoichiometric growth of CZTS by hydrothermal method

PP-90

Nilofar Bagwan

Synthesis, Characterization and exhibition of Field Electron Emission characteristics

of rGO

PP-91

R. R. Udawant

Performance studies of a refractive type line focused, Fresnel lens solar concentrator

on horizontal and tilted surface

PP-92

Sandhya Gadge

Kinetic study of sonodegradation of methylene blue using spindle shaped cerium

oxide

PP-93

Hinge Sarika Blasaheb

Mechanical properties of RBC using Optical Tweezer

PP-94

Sarika Jadhav

Synthesis and capacitive performance of MnO2/rGO nanocomposite for Energy

Storage Application

PP-95

Shruthi Nair

Synthesis and characterization of inorganic K3Bi2I9 thin films for lead-free solution

processed solar cells

PP-96

Chaitali V. Jagtap

Harvesting Artificial Light under Green Energy Technologies for Smart Cities

PP-97

Vishal S. Kadam

Fabrication of MgO–Coated TiO2 Nano Porous Film for Dye Sensitized Solar Cell

PP-98

Pankaj K. Bhujbal

Deposition of Al doped ZnO Thin Films: RF Magnetron Sputtering and Physical

Properties

PP-99

Trupti T. Gaikwad

Synthesis of Gold Nanoparticles and their Size optimization using Low Energy Ar+

Ion Irradiation Technique

Raman Memorial Conference - 2020 Keynote

Molecular tools for the manipulation of size, surface chemistry and

assemblies of metal nanoparticles

B. L. V. Prasad

Physical/Materials Chemistry Division, National Chemical Laboratory, Pune 411 008

Tel: 91-20-25902013. Email: [email protected]

In this talk we will give a brief introduction to the synthetic aspects of nanomaterials. In this realm,

one of the notable achievements is the creation of functional materials out of systems that have

otherwise been thought to be noble and hence non-reactive. The transformation of the intert noble

metals into functional materials not only involves their preparation at nanometer scale but also their

surface functionalization with appropriate molecules. Such surface functionalization assumes

significance not just for their stability in diverse solvent media but defines the way nanoparticles

interact either with themselves or with the environment/biological systems. In general organic

molecules/ligands which have at least one functional group are used for realizing such functional

nanoparticles. Apart from acting as stabilizing agents these ligands have been demonstrated to play a

key role in nanoparticle formation in many aspects viz. controlling their size, morphology and their

dispersional stability in a given medium. Different features of ligands, such as bulkiness, binding

strength and concentration have been found to influence the size of metal nanoparticles especially

spherical nanoparticles. Ligands can also be used to exercise control over the shape of metal

nanoparticles by their specific binding to different crystallographic facets leading to the growth of

anisotropic nanoparticles. The exposed group (present at the end opposite to that attached to the

nanoparticle surface) of the ligands attached to nanoparticle surface can direct the dispersion of

nanoparticles in different solvent media. A dual functioning agent (DFA) is another class of ligands

that act as reducing as well as capping agent and are being used extensively these days. This talk

briefly reviews the role of molecules/ligands as tools for controlling nanoparticle size, morphology

and dispersion stability in different media.

Raman Memorial Conference - 2020 IT-01

Understanding and design of materials using computers

Prasenjit Ghosh

Indian Institute of Science Education and Research, Pune

Abstract

Following the advancement of computers density functional theory (DFT) based simulations and

calculations have been an extremely important tool for not only having a microscopic understanding

material properties but also for predictive designing of materials. In the first part of my talk, I will

show how first principles calculations can provide information about material properties that are not

only difficult to understand from experiments but also sometimes experimentally inaccessible. In the

second part I will provide examples where DFT based calculations have been used to predict novel

materials that has been later synthesized experimentally.


Discovering Materials

S.V.Moharil

Department of Physics, RTM Nagpur University, Nagpur

ABSTRACT

Civilization needs newer and newer gadgets/applications for making life more

comfortable. Materials with specific properties are needed for making innovations possible. We use

the gadgets and technologies but seldom know about the materials that make these technologies

possible. We see typical “bottom up” and “top down” approaches of materials synthesis. In the

former, materials for specific applications are searched in “trial and error” way with some inputs from

literature and much greater dependence on intuitive logic. On the other hand in “top down” approach,

one starts from first principle computations of material properties. Often, the results of such theories/

calculations are unrealistic and difficult to correlate with experimental measurements. A judicious mix

of these approaches is needed for fruitful materials research.

We depend heavily on foreign R & D for these technologies. Even reverse engineering is

difficult since we do not know about the materials. There is huge scope for inventing indigenous,

advanced materials for various applications.

Some important applications are discussed here. These include-

Materials for Energy: Energy Generation, Energy Storage, Energy Saving, materials for Photovoltaic,

Photocatalytic generation of fuel, Economic Substitute for Silicon, Utilization of Full Solar Spectrum,

Materials for antireflection coatings, Materials for protective coatings, Materials for absorptive

coatings, Batteries, Super Capacitors, Hydrogen Storage, etc.

Materials for Consumer electronics: Lighting, Display, Computer Memory

It is concluded that there is vast scope for discovering materials with novel properties

which make various applications possible. R and D abroad has substantial contribution in making

modern technologies available to us. This dependence is undesirable, and wherever possible,

indigenous materials should be used.


Towards High Rate & High Capacity NASICON Cathodes for Na-ion

Batteries

Premkumar Senguttuvan

New Chemistry Unit, International Centre for Materials Science and School of Advanced Materials,

Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064, India

Abstract Electrochemical energy storage is an attractive option to store intermittent energy produced from

renewable sources such wind and solar and to deliver it to consumer utilities. Batteries have

advantages such as high round trip efficiency and low maintenance.1 Despite their continuous

domination in the portable electronics and electric vehicles market, Li-ion batteries could not be a

viable choice for the grid energy storage due to their high cost and limited geographical distribution of

the lithium sources. Therefore, to circumvent this issue, researchers have turned their attention

towards the development of other cation intercalation chemistries, including Na+, K

+, Mg

2+, Ca

2+, Al

3+

and Zn2+

, due to their inexpensive and earth abundant precursors. Sodium-ion Batteries (SIBs) are

striking since sodium has similar chemical character and higher electrochemical reduction potential as

compared to lithium (-2.71 V vs. NHE).2 On the cathode side, phosphate compounds are known for

high intercalation voltages and structural stabilities.3 Among them, NASICON-Na3V2(PO4)3 has been

demonstrated with stellar cycling performance in Na-ion batteries.4 Strategies including nano-sizing,

carbon coating and other cationic substitutions were attempted to improve the electrochemical

performance of Na3V2(PO4)3. Herein, we will discuss our recent findings on the influence of

electronic and crystal structures of NASICON-Na3V2(PO4)3 cathode upon aliovalent cationic

substation.

References:

(1) Dunn, B.; Kamath, H.; Tarascon, J.-M. Electrical Energy Storage for the Grid: A Battery of

Choices. Science 2011, 334 (6058), 928–935. https://doi.org/10.1126/science.1212741.

(2) Ellis, B. L.; Nazar, L. F. Sodium and Sodium-Ion Energy Storage Batteries. Curr. Opin. Solid

State Mater. Sci. 2012, 16 (4), 168–177. https://doi.org/10.1016/j.cossms.2012.04.002.

(3) Masquelier, C.; Croguennec, L. Polyanionic (Phosphates, Silicates, Sulfates) Frameworks as

Electrode Materials for Rechargeable Li (or Na) Batteries. Chem. Rev. 2013, 113 (8), 6552–6591.

https://doi.org/10.1021/cr3001862.

(4) Chen, S.; Wu, C.; Shen, L.; Zhu, C.; Huang, Y.; Xi, K.; Maier, J.; Yu, Y. Challenges and

Perspectives for NASICON-Type Electrode Materials for Advanced Sodium-Ion Batteries. Adv.

Mater. 2017, 29 (48), 1700431. https://doi.org/10.1002/adma.201700431.


Active matter and collective ordering

R. Chelakkot

Department of Physics, IIT-Bombay

Abstract Active matter is a collection of self-motile elements which convert energy to mechanical motion.

Most familiar examples are the flock of birds, fish schools, swarms of bacteria, human crowd, etc.

Physical models used to study such systems have shown rich diversity in collective ordering, sensitive

to the type of interaction. One such simple physical model for self-propelling elements is Active

Brownian particles, which interact via a short-ranged repulsive potential. The non-equilibrium phase

ordering observed in such systems is particularly interesting due to its striking similarities to

equilibrium phase separation. I will present a class of such phase ordering and describe the ways to

analyze them.


X-ray absorption spectroscopy with Indus-2 SRS

Ravikumar, Abharana N., N. Patra, P. Rajput, A.K. Yadav, C. Nayak, A.K. Poswal, S.

N. Jha and D. Bhattacharyya* Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai-400 085, India

*E-mail: [email protected]

Abstract The X-ray Absorption Spectroscopy (XAS) measurement facility at Indus-2 SRS consists

of two operational beamlines which have been setup at two bending magnet ports of Indus-2, namely:

Energy Dispersive EXAFS beamline (BL-08) and Energy Scanning EXAFS beamline (BL-09). The

dispersive EXAFS beamline (BL-08) uses a Si(111) crystal bent in the form of an ellipse in such a

fashion that the synchrotron source and the sample are situated at the two focii of the ellipse so that all

rays emerging from the source get focused at the sample position after getting reflected from the

crystal. Using this technique, EXAFS measurements can be carried out on various kind of samples in

transmission mode in a time scale of 350 msec. using a position sensitive detector, which is ideal for

studying time resolved processes e.g., catalytic reactions. Since the above beamline has the limitation

that samples can only be measured in transmission mode, it posed some restrictions for XAS

measurements on dilute samples and samples deposited on thick substrates. Thus subsequently

another Energy Scanning-type EXFAS beamline (BL-09) has been developed in at Indus-2 SRS

where, using monochromatic beam from a Double Crystal Monochromator, measurements can also be

possible in fluorescence mode and the two EXAFS beamlines act as complementary to each other.

The two beamlines are equipped with XAS measurement facility over large temperature range of

5.4K-1000K. The present talk will briefly describe the above two beamlines.

Since their commissioning the above two XAS beamlines at Indus-2 are in very high

demand by users and utilization of the beamlines has resulted into more than 180 journal publications.

Research groups from all over the country including national institutes, IITs, universities, and

industrial organization and few groups from abroad have used these facilities to characterize their

samples having applications in the field of functional materials, nuclear materials, magnetic materials,

catalysis, biological science etc. Apart from this, in-house research in the front-line areas of materials

science has also been carried out in these beamlines. This talk will present glimpses of the various

types of research works that have been carried out in the above beamlines in last few years.

In the recent past, several new facilities have also been added in these beamlines for

carrying out state-of-art XAS experiments which include in-situ measurement facility on catalytic and

photo-catalytic reactions with high temperature reaction cell with photo-illumination facility and on-

line monitoring by gas chromatograph facility, simultaneous XAS and UV-Vis spectroscopy

measurement facility for monitoring growth of nanoparticles from solution phase, grazing incidence

XAS measurement facility to carry out depth dependent XAS measurements on thin films and

multilayers and hard X-ray magnetic circular dichroism (XMCD) measurement facility for

characterization of magnetic samples. A brief overview of the above facilities will also be covered in

this talk.


Scientific Facilities at UGC-DAE CSR, Indore centre

Vasant Sathe UGC-DAE CSR, Indore

Abstract UGC-DAE Consortium for Scientific Research is a national user facility created by UGC for

providing experimental facilities to University researchers. In this talk a brief account of facilities

open to university researchers at Indore center will be presented. The procedure for the usage and

expected inputs will be discussed. Some scientific examples showing use of Raman spectroscopy in

resolving scientific problems in condensed matter physics will also be shown.

Raman Memorial Conference - 2020 TP-01

Computational Study of Hydrogen Bonded Energetic Materials

B. Moses Abraham1∗, G. Vaitheeswaran

2

1Advanced Centre of Research in High Energy Materials (ACRHEM), University of

Hyderabad, Prof. C. R. Rao Road, Gachibowli, Telangana, Hyderabad-500046, India.

2School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Telangana,

Hyderabad-500046, India.

∗Presenting author: [email protected]

Abstract

The primary objective of the thesis is to provide a clear picture of how the intermolecular interactions,

especially hydrogen bonding, influence the macroscopic properties to enhance the energetic

performance with reasonable sensitivity. In order to conduct these studies, quantum mechanical

calculations were performed using various density functional theory approaches to understand the

physicochemical and detonation characteristics of several energetic ionic salts including structural,

electronic, vibrational and performance parameters (heat of formation, detonation pressures, and

detonation velocities). These computational studies are aimed to design models for accurate prediction

of properties and performance of the existing as well as new energetic materials.

References

1. G. Vaitheeswaran, N. Yedukondalu and B. Moses Abraham, J. Chem. Sci., 128, 1631 (2016).

2. B. Moses Abraham, B. Adivaiah and G. Vaitheeswaran, Phys. Chem. Chem. Phys., 21, 884

(2019).

3. B. Moses Abraham and G. Vaitheeswaran, Mat. Chem. Phys., 240, 122175 (2020)

4. B. Moses Abraham, J. Prathap Kumar and G. Vaitheeswaran, ACS Omega, 3(8), 9388 (2018)

5. J. Heyd, G. E. Scuseria and M. Ernzerhof, J. Chem. Phys., 118, 8207 (2003).

6. S. K. Wol_, D. J. Grimwood, J. J. McKinnon, D. Jayatilaka and M. A. Spackman,

CrystalExplorer University of Western Australia (2005).

7. M. Suceska, Propellants Explos. Pyrotech., 24, 280 (1999).

8. B. Moses Abraham, Vikas D. Ghule and G. Vaitheeswaran, Phys. Chem. Chem. Phys., 20,

29693 (2018).


Catalytic Activity of Ru-Based Nancomposites as Heterogeneous Catalyst

Towards Organic Transformations

Hari R. Pawar#a, Rajeev C. Chikate

a*

aDepartment of Chemistry, MES’S Abasaheb Garware College, Karve road, Pune,411004.

Abstract In recent past, Ru-based catalyst have been well explored as it belongs to Platinum-Group, noble and

catalytically precious transition metal1. Owing to its mild reactivity, high chemo selectivity,

compatibility to variety of functional groups, solvents and facile redox chemistry2. The noble work by

Grubbs in the development of olefin metathesis has led to upsurge of interest in exploring the catalytic

activity of Ru-based catalysts towards diverse organic transformations including C=C and C-N

couplings, C-H activation oxidation, hydrogenation reactions3. However, wide range of

mechanistically different processes like thermal as well as photochemical reactions are

catalyzed by

ruthenium based catalyst under homogenous condition due to its excellent catalytic activity; but its

usage is restricted due to tedious work up, lack of reusability of catalyst4. To overcome these lacunas,

we hypothesized strategy on the basis of immobilization of Ru based catalyst on a solid support. The

rationale behind the designing such functional materials is to explore beneficial catalytic activity. To

summarize, these attributes : The supported Ru-based NP’s are found to be better alternative because

of i) higher specific surface area, ii) generation of distinct reaction sites, iii) synergistic association of

catalyst and support. Such a synthetic strategy is further modified by dispersing these Ru-based in

host materials like Na-MMT clay. This has distinct advantages: (i) its acidity can be tuned as per the

organic reactions, (ii) solid support is effective for stronger adsorption thereby increasing the reaction

rate; (iii) plausibility of its continuous usage. These methodologies are regarded as a sustainable

approach with enhanced service life of the composites. Chapter II: The details of experimental

procedures of RuNP’s, Na/MMT, MMT supported Ru and RuO2 nanocomposites utilized for the

thermal reactions are described. It also comprises synthetic procedures for [Ru(bipy)3]Cl2 and MMT,

TiO2 and SiO2 supported [Ru(bipy)3]2+

composites as photocatalyst5. Chapter III: This chapter

describes click process where Ru/MMT catalysed nitrile- azide dipolar cycladdition reaction is carried

out under thermal conditions in DMF as solvent. The catalyst was characterized by XRD, XPS, Py-IR,


FESEM and HRTEM analyses. These composites were optimized towards the synthesis of C-

substituted tetrazoles. It is found that acidity of composite and coordination ability of Ru and RuO2 is

responsible for this transformation. To substantiate this proposition, we have prepared acidity tune

MMT supported RuO2 nanocomposites different loading of RuO2 and screened towards synthesis of

N-substituted tetrazoles. The reusability study and post characterization is also been provided6. The

structure identification of synthesized tetrazoles is also been done by physical constants and 1H,

13C

spectroscopy. Chapter IV: In this chapter various weight % composite of [Ru(bipy)3]2+

on MMT

support are prepared as photocatalyst and characterized. The optimization experiment was carried out

towards photo induced oxidative cyclization. The potentiality of photocatalyst was evaluated for

synthesis of bioactive benzazoles7. The synthesized compounds are characterized by physical

constants and 1H,

13C spectroscopy. The reusability of study is also been demonstrated to prove the

sustainability of the photocatalyst. The mechanistic view is also been proposed. Chapter V: In this

chapter we explored the feasibility of composite formation of [Ru(bipy)3]2+

on various supports like

TiO2, SiO2 and MMT clay. The genesis of this approach involves heterogenisation of photocatalyst on

photoactive/inert supports. That may enhance its efficiency towards cycloaddition reactions. This

supported photocatalyst are screened for visible light induced cycloaddition reactions. The proposed

mechanism is suggested for this transformation.

Keywords: Ruthenium nanocomposites, heterogeneous catalyst.

#: Presenting author: [email protected]

* Corresponding author: [email protected]

Acknowledgement: Authors are thankful to BCUD SPPU and Principal Abasaheb Garware

College, Karve road, Pune for providing funding and infrastructural support.

References:

1. F. R. Hartly, Chemistry of the Platinum Group Metals, Els. Sci., Volume 11,1st edition, 1- 642,.1991,

2. P. M. Petra E.de Jongh and K. P. De Jong, Chemical reviews, 3,1234., 2014

3. R.H Grubbs and T. K. Brunck, J.Am. Chem. Soc, 94, 253-255, 1972.

4. S. T. Nguyen, L. K. Jonson and R. H. Grubbs, J. Am. Chem. Soc, 114,3974., 1992

5. P. Schwab, M. B. France and J. W. Ziller, R. H. Grubbs, Angew. Chem., 34, 2039-2049, 1995

6. H. R. Pawar, A. P. Jakhade and R. C. Chikate, ChemistrySelect , 2, 6949-6956, 2017.

7. A. R. Wade, H. R. Pawar, M. V. Biware and R. C. Chikate, Green Chem., 17, 3879-3888,2015.


Thermal Plasma Synthesis of Magnetic Nanoparticles for Ferrofluid Based

Applications

Suyog A. Rauta#

, S. Premkumara,b

, Sudha V. Bhoraskara and Vikas L. Mathe

a*

aDepartment of Physics, Savitribai Phule Pune University, Pune, 411007

bArmament Research and Development Establishment, DRDO, Pashan, 411021

Abstract Here we report use of nanocrystalline magnetic particles synthesized by thermal plasma to obtain

stable suspension of magneto-rheological fluid from the view point of replacing Carbonyl Iron (CI)

whose applications are limited due to serious issue of sedimentation. Iron oxide being chemically

stable and possesses reasonable magnetic properties; it could be explored for its use in place of CI in

magnetic damper system. The nanocrystalline iron oxide particles were prepared by thermal plasma

route and characterized thoroughly. The magnetic nanoparticles of CI and Iron Oxide Nanoparticles

(INOP) were dispersed in oil medium separately and investigated for their dispersion behavior.

Further, a small proto-type device has been developed to investigate performance of magneto-

rheological fluid. A prototype device consists of piston arrangement whose shaft is connected to the

stepper motor to provide ‘to and fro’ motion inside the magnetic fluid. The speed of the stepper motor

was varied so as to change Rotation per Minute (RPM) of the piston and hence ‘to and fro’ frequency

of the piston. The assembly containing magnetic fluid and piston arrangement was fixed between the

pole pieces of electromagnet. At the bottom of the device a piezoelectric sensor was fixed to detect

the vibrations arising due to movement of the piston inside the fluid. The signal detected by the

piezoelectric sensor was recorded as a function of magnetic field, solid loading and RPM of piston

moving inside the fluid. Also the metal, alloy and ferrite nanoparticles were also used to prepare

magnetic fluid and used for mechanical vibration damping.

Figure: Vibration damping of IONP based ferrofluid in presence and absence of magnetic field

Keywords: Magnetic Nanoparticles, Carbonyl Iron, Solid-liquid dispersion, Magnetic

vibration damper, Rheological Properties

#Presenting author: [email protected] *Corresponding author: [email protected]

References:

[1] S. Kciuk, M. Kciuk, R. Turczyn, P. Martynowicz, Adv. Mater. Res. 628, 512–517, (2012)

[2] S. Raut, N. Kanhe, S. Bhoraskar, A. Das, V.L. Mathe, J. Appl. Phys. 116, 163913 (1–6)

(2014)

[3] S.A. Raut, P.R. Mutadak, S. Kumar, N.S. Kanhe, S. Huprikar, H.V. Pol, D.M. Phase, S.V.

Bhoraskar, V.L. Mathe, J. Magn. Magn. Mater. 449, 232–242 (2018)


Studies on Magnetoelectric Properties of Lead-free Piezoelectric and

Magnetostrictive Cobalt Ferrite Composite Multiferroics

Bhavna C Keswani, S. I. Patil (Co-guide) and Y. D. Kolekar (Guide)

Department of Physics, S. P. Pune University, Pune: 411007

Abstract

In recent years, multifunctional materials which can combine multiple properties in the single

material are increasingly gaining attention by the scientific and research community. In this

connection, multiferroics or magnetoelectric materials have been extensively studied due to their novel

applications such as magnetic field sensors, magnetic recording read head, multi-state memory devices,

magnetoelectric random access memory, spintronics, transformers, etc. Multiferroics (MF) are the

materials which exhibit more than one ferroic order/functionality (ferroelectricity, ferromagnetism or

ferroelasticity simultaneously). In particular, ferroelectricity and ferromagnetism have attracted

considerable interest due to their interesting physical properties and wide range of applications in

magnetic data storage, sensors, non volatile memories, actuators, etc. Along with the coexistence of

two ferroic orders, strong coupling interaction between the two ferroic orders is also required, which

can produce additional characteristic features/functionalities such as magnetoelectric (ME) effect.

The ME effect is defined as an induced electric polarization (P) in the material with an applied

magnetic field (H) or vice versa. According to material constituents, ME multiferroic materials are

divided into two types viz. single phase and composite MFs. The single phase MFs exhibit intrinsic

ME effect but they have low Curie temperature and weak ME coupling (except BiFeO3 which have

high Curie temperature i.e. above room temperature (RT)) which hinders their practical applications.

On the other hand, composite MFs are composed of different phases (eg. Magnetostrictive ferrite

phase, piezoelectric/ferroelectric phases, etc.) in which neither constituent phase exhibit ME effect,

but its composite phase can produce significant ME effect. Therefore, the ME effect in case of

composites, is the result of magnetostrictive and piezoelectric effects in the magnetic and ferroelectric

phases, respectively. Furthermore, the ME effect in composite is extrinsic depending upon the

coupling interaction across the magnetic-piezoelectric interfaces. Moreover, large ME response at and

above RT can be achieved in ME composites by tuning the properties of individual phases of

composites, which makes the multiferroic composite system a potential candidate for new

multifunctional devices such as sensors, transducers, memory devices, spintronics, etc. The ME

composite usually includes combination of Pb(Zr,Ti)O3, BaTiO3, etc as a piezoelectric phase and

CoFe2O4, NiFe2O4 as a magnetostrictive phase. For achieving strong magnetoelectric coupling,

modification in the constituent phases can be made so that the piezoelectric and magnetostrictive

coefficient values can been enhanced.


In the present work, different piezoelectric phases based on BaTiO3, (Ba,Ca)TiO3 and

Ba(Ti,Zr)O3 and magnetostrictive phases based on CoFe2O4 and (Co,Mn)(Fe,Dy)2O4 were synthesized

by standard solid state reaction method and investigated their physical properties. All the observed

data were analyzed and interpreted systematically. Further, from the studied piezoelectric and

magnetostrictive phases, (Ba,Ca)TiO3-Ba(Ti,Zr)O3 i.e. BCT-BZT and (Co,Mn)(Fe,Dy)2O4

compositions exhibit highest value of piezoelectric coefficient (365 pC/N) and magnetostrictive

coefficient (λ11 = -95 ppm, λ12 = 52 ppm and strain sensitivity dλ/dH = 75*10-3

ppm/Oe at low

magnetic field i.e. 600 Oe), respectively. Therefore 0.9[BCT-BZT]-0.1 (Co,Mn)(Fe,Dy)2O4 ME

particulate composite is chosen for investigating their magnetoelectric properties. And, it has been

observed that, along with the multiferroic nature, the ME composite exhibits strong ME coupling at

room temperature, which can makes them suitable candidate to replace the single phase multiferroic

material.


Aqueous Droplet Manipulation by Electrowetting on Dielectrics

Sandip M. Wadhai#, Abhay V. Limaye and Arun G. Banpurkar*

Centre for Advanced Studies in Materials Science and Condensed Matter Physics,

Department of Physics, Savitribai Phule Pune University, Pune -411007 (India)

Abstract

Wettability of liquid on solid surface is controlled by modifying surface chemistry and/or surface

roughness. There are several conventional techniques to control wetting properties such as thermo-

capillarity, photo-wetting and magneto-wetting. However, the electrowetting on dielectrics (EWOD or

EW) is an excellent tool to control the wetting of liquid drop by external electric voltage [1]. EW

finds numerous practical applications mostly in the field of microfluidics [2, 3], lab-on-chip devices

[4], adaptive liquid lens [5], video displays [6] and also used as a tensiometer [7]. EW based devices

mostly prefers Young’s angle (𝑦) more than 150o with large contact angle change, consistent EW

response for long duration, thermally stable wetting response for wide temperature range from −40 to

70 oC and large contact angle actuation for small applied voltage. The hydrophobic (low surface-

energy) dielectrics in oil ambient or superhydrophobic surfaces attains a large contact angle.

Further investigation needed to In this study, we mainly focuses on the investigation of efficient,

consistent and thermally stable EW contact angle change on suitable dielectric surfaces. Teflon AF

and Cytop are the excellent fluoropolymers known for robustness, water-repellence and chemical

inertness utilized as a hydrophobic dielectrics in EW study. In a practical situation, these

fluoropolymers demonstrate asymmetry in contact angle change for dc-voltage electrowetting. We

explore that, this asymmetry is mainly due to charge trapping and highlighted the process of water-ion

adsorption on the dielectric surface. We used EW technique to quantify the density of such ions on the

hydrophobic surface and the nature of trapped charge is verified by using streaming potential

measurements. Finally, the reliable EW response for a long duration (many voltage cycles) is

observed with positive biased voltage.

Thermal stability of EW response is one of the important aspects in electrowetting based applications.

In this aspect the temperature dependent EW is observed on thermostable aqueous-ethylene glycol

(EG) droplet in the ambient silicone oil over the broad temperature range from -25 to 65 oC. The

variation in EW contact angle switching time is measured as viscosity and interfacial tension

increases with reducing temperature. Finally, the construction and working of a prototype liquid lens

at the lowest operating temperature of -25 oC is demonstrated.

EW based applications desires large actuation at low voltage magnitude. Enhancement in EW

response is mainly due to large capacitance value. It is obtained by increasing dielectric constant and

decreasing dielectric thickness. Low dialectics thickness has limitations of dielectric breakdown

voltage. Therefore, the ferroelectric polymers having high dielectric constant are excellent choices in

such cases. As ferroelectric polymers are not hydrophobic, a top-coat of fluoropolymer (Teflon AF,

Cytop) is essential to increase the hydrophobicity. The effective dielectric constant of such bilayer

depends on individual dielectric thickness to achieve the desired value of capacitance. In this study,

we explored the dependency of an individual thickness of ferroelectric PVDF-HFP and the top layer

of Teflon AF to achieve high dielectric constant. The electrowetting characterization is used to

illustrate the equivalent capacitance and corresponding effective dielectric constant is calculated. The

changing contact angle change per unit applied voltage decides the effectiveness of EW. Maximum

contact angle change per unit applied voltage 3.5 o/V is observed for 300 nm to 700 nm thick PVDF-

HFP ferro-polymer with top coated 50 nm Teflon AF. We have demonstrated an efficient, reliable and

thermally stable ac voltage EW on PVDF-HFP/Teflon AF bilayer (3.5 o/V) by using thermostable

aqueous-ethylene glycol (EG) droplet in the ambient silicone oil. As PVDF-HFP is a ferroelectric

fluoropolymer, we further focused on the possibility of spontaneous polarization and its effect on the

Electrowetting response for closed voltage cycle and for both positive and negative voltage polarities.


Superhydrophobic surfaces are widely used in various industrial and self-cleaning applications. We

further demonstrated the EW based manipulation of an aqueous droplet on the copper

superhydrophobic surface. Wetting transition from Cassie-Baxter to Wenzel state is observed with

increasing voltage magnitude.

Figure 1: The schematic of prototype liquid lens for thermostable aqueous-ethylene glycol (EG)

droplet in the ambient silicone oil at the lowest operating temperature of -25 oC.

Keywords: Wetting, Electrowetting, Hydrophobicity, Superhydrophobicity

#: Presenting author: *: Corresponding author:

[email protected] [email protected]

Acknowledgement: I would like to acknowledge CSIR, Govt. of India, for senior research

fellowship (SRF) (09/137(0578/2018-EMR-I)

References:

1. Mugele, F. and J.C. Baret, Electrowetting: From basics to applications. Journal of Physics-

Condensed Matter, 2005. 17(28): p. R705-R774.

2. Haller, B., et al., Charge-controlled microfluidic formation of lipid-based single- and

multicompartment systems. Lab on a Chip, 2018. 18(17): p. 2665-2674.

3. Guan, Y., et al., Deformation, speed, and stability of droplet motion in closed electrowetting-based

digital microfluidics. Physics of Fluids, 2019. 31(6).

4. Ugsornrat, K., et al., Low-Cost and Disposable Electrowetting-on-Dielectric Lab on a Chip With

an Integrated Electrochemical Detector Fabricated by Screen-Printing Process. Ieee Sensors

Journal, 2019. 19(19): p. 8597-8604.

5. Murade, C.U., D. van der Ende, and F. Mugele, High speed adaptive liquid microlens array.

Optics Express, 2012. 20(16): p. 18180-18187.

6. Zhou, R., et al., Experimental study on the reliability of water/fluoropolymer/ITO contact in

electrowetting displays. Results in Physics, 2019. 12: p. 1991-1998.

7. Banpurkar, A.G., K.P. Nichols, and F. Mugele, Electrowetting-based microdrop tensiometer.

Langmuir, 2008. 24(19): p. 10549-10551.

U

Raman Memorial Conference - 2020 OP-1

Growth of Palladium Nanoparticles and Their Application in Ethanol

Electrooxidation

Akshay N. Vyasa and S. D. Sartale

a,*

a Thin Films and Nanomaterials Laboratory, Department of Physics, Savitribai Phule Pune University,

Pune , India – 411 007

Abstract

Palladium nanoparticles were grown on graphite substrate using a simple and effective successive

ionic layer adsorption and reaction (SILAR) method. Palladium chloride and sodium borohydride

were used as precursors. Grown Pd nanoparticles were confirmed to have FCC structure by X-ray

diffraction (XRD). X-ray photoelectron spectroscopy (XPS) results support the presence of metallic

Pd nanoparticles. Field emission scanning electron microscope (FESEM) was used to observe the

morphology of the grown Pd nanoparticles. The grown Pd nanoparticles were tested for their

electrochemical activity towards ethanol electrooxidation. The effects of variation in PdCl2

concentration and number of SILAR cycles were studied. The grown Pd nanoparticles showed

excellent electrocatalytic activity towards ethanol electrooxidation.

Keywords: Ethanol electrooxidation, Palladium nanoparticles, Successive ionic layer

adsorption and reaction.


*: Corresponding author: [email protected]


The effect of Dzyaloshinskii-Moriya interaction on entanglement in a

transverse magnetic field spin -1/2 XXZ chain

Pradeep S. Thakur*, P. Durganandini

Department of Physics, Savitribai Phule Pune University, Pune– 411007, India

Abstract

We studied the effect of a Dzyaloshinskii-Moriya interaction (DMI) on two estimators of bipartite

entanglement - one-tangle, Γ, and concurrence, C - in the spin -1/2 XXZ chain in the presence of a

transverse magnetic field. In the absence of DMI, both Γ and C vanish in the antiferromagnetic

(AFM) phase at a finite value of the transverse field, commonly known as the factorising field, hF.

The presence of a transverse DMI, Dx, does not change this situation. In the presence of a longitudinal

DMI, Dz, Γ and nearest-neighbour C go to a nonzero minimum. At this minimum, Dz introduces

entanglement between only nearest-neighbour spins. We conclude that the orientation of the DMI

plays a decisive role in determining whether factorisation occurs or not.

*Presenting author: [email protected]

References

1. Modi, K. et al., Rev. Mod. Phys. 84, 1655-1707 (2012)

2. White, S. R., Phys. Rev. Lett. 69, 2863 (1992)

3. Kurmann, J. et al., Physica. A 112, 235-255 (1982)

4. Nielsen, M. A., Chuang, I. L., Quantum Computation and Quantum Information(Cambridge

University Press, Cambridge, 2000)

5. Bauer, B. et al., J. Stat. Mech. Theor. Expt. 05, P05001 (2011)


Investigation of SERS activity of industrial pollutant on thermally reduced

spin coated Ag nanoparticles

Imran Shaikh and Shrikrishna Sartale*

Thin Films and Nanomaterials Laboratory, Department of Physics,

Savitribai Phule Pune University, Pune 411 007, India.

*Corresponding author: [email protected]

Abstract

Surface enhanced Raman scattering (SERS) enhances the Raman signal up to 1013

-1015

times which

makes SERS as an ultrahigh sensitive technique for the trace detection of various molecules.

Electromagnetic field enhancement (EME) and chemical enhancements (CE) are considered to be the

main mechanisms responsible for such huge enhancement in the Raman scattering. EME results from

the localized surface plasmon resonance (LSPR) and the CE originates from the charge transfer

between the adsorbate and the substrate. Size, shape of the plasmonic metal nanoparticles, excitation

source and the interaction of the probe molecules with the plasmonic metal nanoparticles plays crucial

role in order to decide the SERS enhancement. Present work demonstrates a simple low cost and

reproducible spin coating method followed by thermal reduction for the uniform growth of Ag

nanoparticles as SERS substrate. The growth parameters have optimized to get maximum SERS

enhancement factor for industrial pollutants namely methylene blue and congo red.


Structural and Optical properties of Cu doped SnO2: A computational

study.

V. S. Ghemuda,b#

and Anjali Kshirsagara

aDepartment of Physics, S.P.P.U., Ganeshkhind, Pune 411007

bDepartment of Physics, BJS’s ASC College, Wagholi, Pune 412207

Abstract This Tin oxide (SnO2) has emerged as an promising material for applications in sensors, solar cell,

battery, supercapacitors etc. It is and n-type intrinsic semiconductor with a wide band gap of ~3.6eV

at room temperature for bulk. It also shows size dependent structural, optical, electrical, and

morphological characteristics. These properties can be easily altered by introducing defects or by

doping. In the following paper we have focused on exploring the doping effect on pristine SnO2

computationally by using density functional theory (DFT) implemented in the quantum espresso (QE)

package. Copper (Cu) has been proposed by few research groups to be altering the magnetic

propetrties of SnO2, hence we have focused on the same dopant butfrom a different view. With a

possible application in the field of dosimetry we have studied the effect of doping on the optical

properties using a super cell approach. A prominent change has been observed in the band spacing of

SnO2 due to the introduction of dopant, which can be related to the experimental observations of trap

levels/metastable states.

References:

1. Lijun Li, Ke Yu, Zheng Tang, Ziqiang Zhu and Qing Wan; Journal of Applied Physics, 107,

014303 (2010)

2. Pawan Chetri, Bhamyarswa Saikia and Amarjyoti Choudhury; Journal of Applied Physics,

113, 233514 (2013)

3. Kai-Cheng Zhang, Yong Liu, Yong-Feng Li and Yan Zhu; Journal of Applied Physics, 113,

053713


Studies on structural and ferroelectric properties of lead-free

Ba0.97Ca0.03Ti1-xSnxO3electroceramics

P. S. Kadhane, D. M. Phulsundar, B. G. Baraskar, T. C. Darvade, T. K. Jadhav, R. C.

Kambale*

Department of Physics, Savitribai Phule Pune University, Pune 411 007, Maharashtra, India

Abstract

The lead-free Ba0.97Ca0.03Ti1-xSnxO3 (BCTS, x=0.025 and 0.035 mol %) electroceramics were prepared

by solid-state reaction; and studied their structural, microstructural, dielectric and ferroelectric

properties. BCTS with composition x=0.025 and 0.035 both revealed the formation of tetragonal

perovskite structure without trace of any secondary phase formation at room temperature, which is

evidenced by X-ray diffraction and temperature-dependent Raman spectroscopy study. Dense

microstructure with an average grain size of 24 μm and 30μm, having bulk densities of 6.00 g/cm3 and

5.86 g/cm3 are observed for x=0.025 and 0.035 respectively. The temperature-dependent dielectric

study depicts three polymorphic phase transitions corresponding to the rhombohedral to orthorhombic

(TR-O), orthorhombic to tetragonal (TO-T) and tetragonal to cubic (TC) phase transitions. The

x=0.025compositiongives TR-O at -60 oC, TO-T at 16

oC, TT-C at 130

oC and x=0.035 composition shows

TR-O at -50 oC, TO-T at 20

oC, TT-C at 122

oC. Temperature-dependent polarization-electric field (P-E)

hysteresis loops provide information about the ferroelectric to paraelectric phase transition for BCTS

ceramics with compositions x=0.025 and 0.035 which supports the temperature-dependent dielectric

and Raman spectroscopy studies.

Keywords: Lead-free, BaTiO3, Ferroelectrics, Curie temperature.




First principle investigations of CsSnX3 (X = Cl, Br, I) quantum dots

Namrata Jaykhedkar,1 Bhakti M. Kshirsagar,

1;2 Shivani Tiwari,

1 Vaishali Shah,

1

Kalpna Jain,3 Shyam Kishor

4 and L.M.Ramaniah

5

1Interdisciplinary School of Scientific Computing, S. P. Pune University, Pune 411007

2Department of Physics, S. P. Pune University

3Department of Physics, D. J. College, Baraut, Uttar Pradesh, India, 250611

4Department of Chemistry, J. V. College, Baraut, Uttar Pradesh, India, 250611

5High pressure physics division, Bhabha Atomic Research Centre, Trombay, Mumbai, India, 400015

Abstract

First principle electronic structure calculations have been performed on passivated CsSnX3 (X= Cl,

Br, I) quantum dots (QD). Three quantum dots of size 1.4 nm (QD-1), 2.0 nm (QD- and 2.5 nm (QD-

3) have been considered in this study. We have investigated the effect of quantum confinement,

variation in dot-size, ligands and the halide composition on the energy gaps and optical absorption.

Time-dependent density functional theory has been used to investigate the excited state energies and

electronic transitions of the optimized ground state geometrics. Charge transfer analysis using the

natural transition orbitals (NTOs) showed that major proportion of charge transfer occurs from the

halide to the Sn atom during excitation in QD-2, while in QD-1 the amount of charge transfer is small

from oxygen atom of the OH ligand to the Cs atom in CsSnCl3 and CsSnBr3 systems and from I to Sn

in CsSnI3. The analysis of density of states reveals that the reduced energy gap in quantum dots in

comparison with bulk is due to the insertion of the ‘p’ electronic levels of halides at the top of the

valence band. This work proposes that, electronic and optical properties can be improved by tuning

the size, ligands and halide composition of CsSnX3 quantum dots, making CsSnX3 a promising

candidate for solar cell applications.

(a) (b)

Fig. 1. QD-2 CsSnCl3 (a) cluster and (b) NTOs of prominent excited states, left figure

indicates hole charge density distribution in the ground state and the right figure indicates

electron charge density distribution in the excited state. The blue coloured atoms are cesium,

grey are tin, green are chlorine and navy blue are hydrogen.


Edge Distortion in Zigzag SnSe Nanoribbons

Aniruddha Kibey

Department of Physics, Savitribai Phule Pune University, Pune , India – 411 007

Abstract

In the last decade many new two dimensional materials such as phosphorene, transition metal

dichalcogenides etc. have been studied. Amongst these phosphorene, due to it's bandgap of 1.88 eV

and high electron mobility, has attracted a great deal of interest. Zigzag phosphorene nanoribbon

devices exhibit negative differential resistance (NDR), which has many applications in various

devices. However phosphorene nanoribbons have a high tendency to get oxidized, which to

degradation of performance of the device[1]. SnSe has similar geometric structure as phosphorene.

Moreover SnSe nanoribbons have a lower oxidization rate as compared to phosphorene nanoribbons,

making them better candidates for device applications[2]. However the atoms in phosphorene exhibit

a strong covalent bonding while in 2d SnSe the atoms show a weaker ionic bond. Due to this the

zigzag SnSe nanoribbons exhibit significantly greater distortion at the edges than the phosphorene

nanoribbons. In this work we consider the SnSe nanoribbons with four different repetitions in the

periodic direction and study the edge distortions and their effects on the electronic structure.

References:

1. S. Koenig, R. Doganov, H. Schmidt, A. Castro-Neto, and B.\"{O}zyilmaz, Appl. Phys.

Lett., 104 , 103106 (2014).

2. Yu Guo, Si Zhou, Yizhen Bai, and Jijun Zhao, ACS Appl. Mater. Interfaces, 9,

12013,(2017).


Visible Light Photo-detector using Nano-crystalline Cadmium Sulfide

Thin Films Devidas I. Halge

a,#, Pooja M. Khanzode

a, Vijaykiran N. Narwade

a, Kiran D. More

a,

Sumayya Beguma, Sabah Taha

a, Suhas M. Jejurikar

b, Jagdish W. Dadge

c,

Abhimanyu S. Ranad and Kashinath A. Bogle

a,*

aThin Films and Devices Laboratory, School of Physical Sciences, Swami Ramanand Teerth

Marathwada University, Nanded – 431606 bNational Center for Nanoscience and Nanotechnology, University of Mumbai, Mumbai-400098

cDepartment of Physics, College of Engineering, Pune-411005

dCenter for Advanced Materials and Devices, School of Engineering & Technology, BML Munjal

University, Gurgaon 122413

Abstract In this work, we report fabrication of high quality visible light photo-detector based on uniform nano-

crystalline cadmium sulfide (CdS) thin film deposited on glass substrate using spray pyrolysis

technique. Structural, morphological and chemical analysis of the film confirms nano-crystalline

nature of CdS thin film with ~ 30 nm crystallites and uniform coating of CdS on glass. Finger

electrodes were made on the film using Ag paste. Photo-detection property of nano-crystalline CdS

thin films was tested under visible light illumination. For photo-detection, the response of incident

light in terms of photo-current was monitored when exposed to different wavelengths ranging from

420 to 700 nm. The fabricated device showed significant photo-detection at lower operating voltage

(2 V) for low power (< 10 mWcm−2

) light. Time response measurements at different wavelength show

ultra-fast response and decay time and high photo sensitivity at low bias voltage.

Figure: (a) I-V characteristics of nano-crystalline CdS thin film photo-detector collected at various light

intensities and (b) photo-response measured at bias voltage of 10 V for continuous light ON-OFF cycles

Keywords: Nano-crystalline; CdS; spray coating; photo-detector, ultra fast response and

decay time



References:

1. M. Choi, Y. J. Park, B. K. Sharma, S.-R. Bae, S. Y. Kim and J.-H. Ahn, Science Advances, 4, 8721 (2018)

2. S. Munde, N. Shinde, P. Khanzode, M. Budrukkar, P. Lahane, J. Dadge, S. Jejurikar, M. Mahabole, R. Khairnar and K. Bogle, Material

Research Express, 5, 066203 (2018) 3. B. S. Chen, G. W. Meng, Q. L. Xu, X. G. Zhu, M. G. Kong, Z. Q. Chu, F. M. Han and Z. Zhang, ACS Nano, 4, 7105 (2010)

4. I. E. Morales-Fernández, M. I. Medina-Montes, L. A. González, B.Gnade, M. A. Quevedo-López and R. Ramírez-Bon, Thin Solid

Films, 519, 512 (2010).

0 5 10 15 20 25 30 35

0

20

40

60

80

100

120

Cu

rren

t (u

A)

Applied Voltage (Volt)

Dark

320 mW/cm2

80 mW/cm2

35 mW/cm2

20 mW/cm2

5 mW/cm2

0 100 200 300 400 500 600 7000

15

30

45

60

75

Cu

rre

nt

(uA

)

Time (Sec)

320 mW/cm2

80 mW/cm2

35 mW/cm2

20 mW/cm2

5 mW/cm2

Read @ 10 V(a) (b)


Discovery of Radio-relic and the diffuse emission sources in merging and

non-merging galaxy clusters

Sameer Salunkhe and Surajit Paul

Department of Physics, S. P. Pune University, Ganeshkhind, Pune 411007, India

presenting author: [email protected]

Abstract

Clusters of galaxies are the largest (~Megaparsec scale) gravitationally bound structures in

the Universe. They are in general in thermal equilibrium and are prominent X-ray sources.

But, some of them are also detected at radio wavelength[1] confirming the presence of

cosmic-ray electrons and magnetic fields in the Intra-Cluster Medium (ICM). Since radio

synchrotron emission from galaxy clusters are transient phenomena on cosmological

timescales, it is definitely connected to the dynamical states of the systems. And the radio

study of the galaxy clusters also allows us to understand the particle energy spectrum better.

In this work, we have studied such two galaxy clusters (Abell 1697 and Abell 980) in multi-

radio frequency as well as in X-ray to understand its dynamical state and particle energy

spectrum.

FIG. 1: ROSAT X-ray photon count map (0.1-2.4 keV) presented in gray, mildly and highly

Gaussian smoothed contours are in dark green and blue respectively. NVSS and LoTSS radio

contours are shown in red and black respectively. The brown dashed circle represents r500

radius, where the X-ray peak (centre) and the Abell cluster centre are marked as cyan `+' and

yellow `_' respectively.

References

1. Ferreti L., Giovannini G.et. al., A&ARv, 20, 54


Infrared Photo-detector using Nano-crystalline Lead Sulfide

Thin Film on Paper Pooja M. Khanzode

a,#, Devidas I. Halge

a, Vijaykiran N. Narwade

a, Kiran D. More

a,

Sumayya Beguma, Sabah Taha

a, Suhas M. Jejurikar

b, Jagdish W. Dadge

c,

Abhimanyu S. Ranad and Kashinath A. Bogle

a,*

aThin Films and Devices Laboratory, School of Physical Sciences, Swami Ramanand Teerth

Marathwada University, Nanded – 431606 bNational Center for Nanoscience and Nanotechnology, University of Mumbai, Mumbai-400098

cDepartment of Physics, College of Engineering, Pune-411005

dCenter for Advanced Materials and Devices, School of Engineering & Technology, BML Munjal

University, Gurgaon 122413

Abstract In this paper, we report an extremely low cost and highly efficient method for fabrication of visible

light photo-detector using nano-crystalline lead sulfide (PbS) thin film. The film was fabricated on

300 GSM paper via spray pyrolysis technique at 100 0C. Structural and morphological analysis carried

out using XRD and SEM of the film confirms the nano-crystalline nature of PbS with size ~ 50 nm

and uniform coating of PbS on paper. Photo-detector devices are prepared by drawing contacts using

4B pencil on the film by keeping a gap of 1 mm between electrodes. Photo-detection property of a

nano-crystalline PbS thin film under visible light illumination show linear I-V suggesting low

resistive contact between graphite electrode and PbS film. The photo-sensitivity measurements reveal

excellent sensitivity of ~ 103 at 20 V. For this graphite/nano-PbS/paper photo-detector, the best rise

and decay time is observed to be 7 and 16 ms, respectively. This simple and low cost fabrication

method results in highly stable and sensitive photo-detectors device, which have fast response and

decay time.

Figure: SEM image of paper (left) and PbS on paper (right)

Keywords: Nano-crystalline; PbS; photo-detector, fast response and decay time



References:

1. R. Saran, R. J. Curry, Nature Photonics 10, 81-92 2016

2. D. Vankhade, A. Kothari and T. K. Chaudhuri, J. Electron. Mater. 45, 2789-2795 2016

3. J. He, M. Luo, L. Hu, Y. Zhou, S. Jiang, H. Song, R. Ye, J. Chen, L. Gao and J. Tang, Journal of

Alloys and Compounds 596 73–78 2014

4. F. Pelayo García de Arquer, F. J. Beck, M. Bernechea and G. Konstantatos, Appl. Phys. Lett. 100,

043101-3 2012


Study on advance oxidation processes for the degradation of water

pollutants using 6 MeV electron irradiation

Ambadas B. Phatangare, Sanjay D. Dhole, Shailendra S. Dahiwale and V. N. Bhoraskar

Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune–

411007, India

Abstract

In the present work, without chemical catalysts or any chemical treatment, we have successfully

carried out ~ 99.9 % degradation of water pollutants namely Methylene Blue, Methylene Orange and

Rose Bengal by 6 MeV electron irradiation, on advanced oxidation method. It is observed that the

irradiation dose plays an important role on the degradation rate. By varying the electron irradiation

fluence, the degradation percentage of water pollutant was measured. The relative degradation

percentage ((C0-C)/C0) × 100 versus electron fluence of solutions clearly depicts that the

decolourization rate increased with increase in electron irradiation fluence. After completion of

electron irradiation, it has been observed that the water polluted solution become colourless and

around 99.9 % degradation take place for all type of water pollutants. It is found that the electron

irradiation method is chemical free and can be used in water purification systems and dye effluent

treatment. Thus, it is confirmed that the irradiation induced degradation method is better as compared

to other chemical degradation methods & effectively takes much less time.

Keywords: degradation, water pollutants, irradiation fluence and 6 MeV electrons.


Ultra thin excitonic solar cells from transition metal dichalcogenides

Laxman Tatikondewar1 and Anjali Kshirsagar

1

1Department of Physics, Savitribai Phule Pune University, Pune 411007, India

Abstract

Two dimensional (2D) monolayers of transition metal dichalcogenides (TMDs) are being extensively

studied for last few years, both experimentally and theoretically. They have proved their usefulness in

spintronics, opto-electronics, energy harvesting devices and energy storage devices because of their

speci c electronic, chemical and magnetic properties. In the present work, we present possible

potential of TMD 2D monolayers for excitonic solar cell. We focus on two bilayer heterostructure

systems, namely MoTe2(2H)/ZrS2(2H) and ZrS2(1T)/ZrSe2(1T). These pairs are chosen on the basis

of their geometric structures and 2D lattice constants obtained using density functional theory. These

2D TMD hetero bilayered structures have type II band alignment, useful in the process of dissociation

of photo generated electron-hole pair into free charges leading to efficient light to electricity

conversion. We have investigated the stability of the bi-layers from the phonon dispersion spectra.

The optical absorption spectra calculated using Bethe-Salpeter (after a single shot GW calculation)

indicate absorption in the IR to visible range. These systems have not been stud-ied in literature for

their potential application in photo-voltaic device like excitonic solar cell. Our study exposes their

potential to be used in photovoltaics as ultrathin excitonic solar cell.

Keywords: TMD hetero structure, ultra thin solar cell


Measurement of flux-weighted average Cross-Section of (, ') and (,n)

Nuclear Reactions in 179

Hf and 180

Hf using bremsstrahlung radiation

G. T. Bholanea, A. B. Phatangare

a, V. D. Bharud

a ,T. Selwyn

a, B. J. Patil

b, S. D. Dhole

a,

S. S. Dahiwalea and V. N. Bhoraskar

a,.

a Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune,

411007, India b Abasaheb Garware College, Pune, 411007, India.

Abstract:

The cross sections of the 179

Hf(,’)179m

Hf and 179

Hf(,’)179m

Hf + 180

Hf(,n)179m

Hf were

experimentally measured for the bremsstrahlung end-point energies of 8 MeV and 15 MeV

respectively, by activation and off-line gamma-ray spectroscopy. The ELEKTA Versa HD Medical

Linac at Vikhe Patil Hospital, Ahmednagar was used. The bremsstrahlung energy distribution was

obtained by GEANT4 simulations. The reaction 197

Au(,n)196

Au was used as monitor to calculate the

integrated photon flux. The cross sections were also calculated as a function of photon energy by the

TALYS 1.9 computer code with default parameters. The flux weighted average cross sections were

from the theoretical values of TALYS 1.9 and TENDL 2019 for mono-energetic photons. The

experimentally determined cross-section values are in good agreement with the theoretically values

from TALYS 1.9 and TENDL 2019.

References:

1. National Nuclear Data Center, information extracted from the NuDat 2 database,

http://www.nndc.bnl.gov/nudat2/

2. J. J. Carroll, M. J. Byrd, D. G. Richmond, T. W. Sinor, K. N. Taylor, W. L. Hodge, Y. Paiss,

C. D. Eberhard, J. A. Anderson, C. B. Collins, E. C. Scarbrough, P. P. Antich, F. J. Agee, D.

Davis, G. A. Huttlin, K. G. Kerris, M. S. Litz, and D. A. Whittaker Phys. Rev. C 43, 1238.


Photoluminescence and Thermoluminescence studies of β-NaGdF4: Tb3+

phosphor crystals

Preeti Kulkarni#, K. H. Gavhane, M. S. Bhadane, V. N. Bhoraskar, S. S. Dahiwale, S. D.

Dhole*

#*Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune,

411007, India

Abstract

The hexagonal phase β-NaGdF4: x % Tb3+

(x=0 to 5%) phosphor crystals with uniform morphology

and considerable monodispersity were synthesized via trisodium assisted hydrothermal route. The

photoluminescence studies showed the strong emission lines corresponding to 5D4 →

7FJ (J = 6, 5, 4,

3) transitions with prominent 5D4 →

7F5 green emission transition at 544 nm. [1]The optimizations of

samples were done by annealing them at different temperatures from 200-800 oC for 2h for systematic

thermoluminescence (TL) studies. A comparative study of pristine and annealed samples were also

performed which revealed phase transformation above 600 ᵒC annealing temperature and interestingly

the photoluminescence emission intensity was enhanced considerably to great extent (~ 9 times) at

800 ᵒC. The gamma rays irradiated TL response was studied and the most favorable TL glow curve

was obtained for β-NaGdF4: 0.5 % Tb3+

annealed at 800 ᵒC and β-NaGdF4:3 % Tb3+

annealed at 700

ᵒC. The thermolumnescence dosimetric peak was observed at 219 ᵒC and 230 ᵒC for β-NaGdF4: 0.5 %

Tb3+

and β-NaGdF4: 3 % Tb3+

phosphor, respectively. The TL response of the phosphor was observed

to be linear in the dose range from 300 Gy to 20 KGy, revealing the NaGdF4: Tb3+

phosphor were

quite well suited for high dose measurements and their respective applications. For trap levels

analysis, the TL glow curve study was carried out through the activation energy -Tstop method in

combination with the Initial Rise Method (IRM). NaGdF4: Tb3+

phosphor are also expected to act as

bi-functional magneto-luminescent probe.[2] Thus, along with high luminescence efficiency, the

strong thermoluminescent properties of NaGdF4: Tb3+

make them a potential phosphor material and

promise to provide new avenue into other applications in radiation dosimetry such as environmental

monitoring, medical radiation dosimetry, agriculture/food sciences, archeological sciences, space

dosimetry etc. [3]

Keywords: Phosphors, hexagonal phase NaGdF4: Tb3+

, photoluminescence, thermoluminescence

#: Presenting Author: preeti@ physics.unipune.ac.in

*: Corresponding Author: sanjay@ physics.unipune.ac.in

References

1. C. Li, Z. Quan, J. Yang, P. Yang, and J. Lin, Inorg. Chem., 2007, 46, 6329-6337.

2. M. Banski, A. Podhorodecki, J. Misiewicz, M. Afzaal, A. L.Abdelhady and P. O'Brienc, J. Mater.

Chem. C, 2013, 1, 801–807

3. B.C. Bhatt and M.S. Kulkarni, Defect and Diffusion Forum, 2014, 347, 179-227.


Towards achieving excellent supercapacitance from K and Na ion

preinserted MnO2 nanostructures

Mangesh A. Desai1 and S. D. Sartale

1

1 Thin Films and Nanomaterials Laboratory, Department of Physics, Savitribai Phule Pune

University, Pune, India - 411 007

Abstract

Herewith a room temperature soft solution route is demonstrated for the deposition of the MnO2 thin

films. Reducing agents namely (MS) - manganese sulfate (MnSO4), (SB) - sodium borohydride

(NaBH4) with different reducing power are used for the facile synthesis MnO2 thin films with

different morphologies. Reducing agents played dual role in deposition of MnO2 thin films by

reducing Mn7+

to Mn4+

as well as acts as a source of sodium (Na+) and potassium (K

+) cations. Those

cation pre-inserts in the crystal structure of MnO2 and makes it more stable. Preinsertion of Na+ and

K+ ions was confirmed by the X-Ray photoelectron spectroscopy (XPS) studies. The plausible growth

mechanism behind occurrence of different morphological forms is proposed. Electrochemical studies

utilized to study variation in charge storage mechanism and specific capacitance of MnO2 thin films.

SB thin films showed superior specific capacitance values than MS thin films for all current densities

and scan rates. The reasons behind inferior surface capacitance performance of MS thin film are

discussed in detail. Whereas Na+ inserted SB thin films contain thin and compact coating helps for

efficient interaction between nanostructured MnO2 electrode material and electrolyte ions leading to

the superior electric double layer (EDLC) and surface redox. Charge storage mechanism results were

supported by electrochemical impedance spectroscopy (EIS) studies.

Keywords:

Manganese Oxide (MnO2), Supercapacitor, Charge storage mechanism, EDLC.


Non-Thermal Synchrotron Radio Emission from Large Scale Structures of

Universe and its Detection Techniques

Manish S Hiray, Sameer Salunke, Dr. Surajit Paul

Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India

Abstract

Forming of galazy clusters are violent in nature. Around 1064

ergs energy is generated during cluster

merger event. This energy is discipated into Intra-cluster medium(ICM) through thermal and non

thermal processes. These two processes are e tient engines to gen-erate high energy charge particles.

These high energy charge particles emitts synchrotron radiation which falls under the radio band.

Radio astronomy is the study of the sky at radio wavelengths. Radio waves can reach to earth without

any atmospheric attenuation. Radio waves lies within wide frequency range of 10 MHz to 300 GHz or

a wavelength range of approximately 1mm to 30m radio astronomy can be done by ground based

telescopes. To detect these radio waves one can use single dish radio antenna or radio interferometer

for the better resolution. To analyse the signals different software packages like AIPS, CASA is used.

Here in this work we will be illustrating the radio interferometer technique, data analysis technique &

results.

FIG. 1. GMRT Data Reduced Image


Optical and Electronic properties of different Nanosize particles of

cadmium sulfide

Ravi V Ingle#, Shrikrishna D Sartale and Habib M Pathan*

Advanced Physics Laboratory

Department of Physics, SP Pune University, Pune

Abstract

The Optical properties are usually related with the internal electronic structures of the nanomaterials.

Hence depending upon the preparation method and use of precursors, the reported band gaps are

different for the bulk form and nacrystalline form of Cadmium sulfide (CdS) [1]. The

Photoluminescence (PL) spectroscopy concluded colloidal solution of CdS produces the color due to

the excitation of free electrons within conduction band (CB) as shown in Figure 1. As the size-

dependent optical property of CdS is due to change in the band gaps, size, shape and interactions with

other materials are strongly influence electronic properties of materials. These colloidal nanomaterials

with larger surface area and with various optical and electronic properties are useful for the

fabrications of Quantum dot sensitized solar cells.

Figure 1: PL spectra and optical absorption for CdS type a to f: comparing the absorbance and

luminescence properties.

Keywords: CdS, nanocrystals, optical and Electronic properties

#: Presenting Author: [email protected]

References:

1. R Viswanatha and DD. Sarma et al. Growth Mechanism of Cadmium Sulfide Nanocrystals. J. Phys. Chem.

Lett. 1 (2010) 304-308.


Estimation of Surface Particulate Matter (PM2.5 and PM10) Mass

Concentration from the Ceilometer Backscattered Profiles

Avinash N. Pardea,b#

, Sachin D. Ghudea*

, and Prakash Pithania

aIndian Institute of Tropical Meteorology, Pashan, Pune – 411008 bSavitribai Phule Pune University, Ganeshkhind, Pune – 411007

Abstract In this study, we used remotely sensed backscattered profiles from a ceilometer to characterize the

vertical and horizontal mixing of aerosols in the polluted planetary boundary layer (PBL) [1]. These

profiles revealed the structure of the boundary layer, which included the mixed layer, the nocturnal

residual layer and the elevated aerosol layer far above the mixed layer over Delhi [2]. The ceilometer

backscattered signal from a height of 45 m above the ground was strongly correlated (82%) with the

observed surface PM2.5 and PM10 mass concentrations. We developed an empirical regression model

based on this relationship, which was then tested and validated against independent measurements of

the concentrations from November 2018. Although local meteorological conditions, particularly

cloudiness and rain, influenced the strength of the correlation between the observed PM2.5 and PM10

mass concentrations and the backscattered signal, the magnitude of the mean bias between the

observed and the values for PM2.5 (–21 µg m–3, RMSE = 75) and PM10 (31 µg m–3, RMSE = 118)

indicated that the predicted values were fairly accurate. The model overestimated the PM2.5 by 7%

and underestimated the PM10 by 6% on clear days.

Figure: Daily mean variation of estimated and observed (a) PM2.5 and (b) PM10 during 1–

30 November 2018. The vertical bar shows the standard deviation.

Keywords: Pollution event; PM2.5 and PM10; Ceilometer backscatter.

#: Presenting author: [email protected] *: Corresponding author:

[email protected]

Acknowledgement:

We would like to thank the Director, IITM, for his encouragement during the study. The

authors also acknowledge to GMR and Airport Authority of India for their logistic support.

References:

1. Münkel, C., Eresmaa, N., Räsänen, J. and Karppinen, A. Retrieval of mixing height and dust concentration with

lidar ceilometer, Boundary Layer Meteorology. 124: 117–128. (2007).

2. Ghude, S.D., Chate, D.M., Jena, C., Premature mortality in India due to PM2.5 and ozone exposure, Geophys. Res.

Lett. 43: 4650–4658, (2016).


Tm-Tstop Analysis and Dosimetric Properties of Ce Doped BaB4O7

Phosphor

Kishor H. Gavhane#, M. S. Bhadane, P. P.Kulkarni, V. N. Bhoraskar, S. D. Dhole*, and

S.S. Dahiwale*

Microtron Accelerator Laboratory, Department of Physics, S. P. Pune University, Pune 411007, India

Abstract

In this paper, gamma ray exposed Thermoluminescence (TL) response in the range 1 Gy to 3 kGy has

been reported for newly synthesized. Optimization of Ce doping in BaB4O7 phosphor have been

studied by varying the Ce concentration from 0.5 to 3 mol %. A simple solid state diffusion method

was used to synthesize the phosphor material. Structural and morphological properties were studied

using X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) respectively.

Monoclinic crystal structure with crystallite size ~ 28 nm and average particle size of ~ 2 µm was

observed. An optical characterization was carried out using photoluminescence (PL) which shows

blue color emission at 320 nm and 340 nm. In dosimetric studies, the two main peaks in TL glow

curve were observed at 176 °C and 311 °C. The intensities of these peaks found to be rising linearly

with raise in gamma dose. To get an estimate value of trap levels, the TL glow curve study was

thoroughly carried out through Activation Energy -Tstop method in combination Initial Rise Method

(IRM). The trapping parameters, Order of kinetics, frequency factor, and Figure of Merit have been

calculated by Glow Curve Deconvolution (GCD) method.

Keywords: Thermoluminescence, Initial Rise Method, Glow Curve Deconvolution, BaB4O7


*: Corresponding author: [email protected] , [email protected]


Civilizations and Materials Use: Historical Perspective

J.D.Desai*

*N.B.Navale College of Com. & Sc. Kusgaon (BK) Lonavala

Gat No.309/310, Kusgaon, Lonavla, (M.S.) India- 410401.

Abstract

Our earth, is part of a vast universe. The universe is about 15 to 20 billion years old. The age of the

earth is approximately 4 to 5 billion years, whereas human beings evolved only around 2 million years

ago. The widely accepted theory of the origin of universe is the “BIG BANG” theory. The universe

started with a huge explosion and matter (dust and gases) filled the entire space. The average

temperature of the earth is 16ºC which is the most comfortable temperature for the living organisms to

survive. Initially conditions on earth were inhospitable for life. Gases of the primitive atmosphere

were primarily methane, ammonia, carbon dioxide and hydrogen. Water vapor filled the atmosphere

but there was no free oxygen. It was thus a reducing atmosphere on primitive earth and no life existed.

When earth cooled, water vapor condensed to form liquid water. Rains poured to form water bodies

on earth. The molecules of life were formed in the water. The molecules of the life evolved bacteria,

the earliest and simplest organisms. The oldest fossils of bacteria which were the first living

organisms on earth have been found in rocks that are 3-5 billion years old. Various kinds of bacteria

lived on earth. One of these evolved a green pigment called chlorophyll, the chlorophyll-containing

bacteria used carbon dioxide and water and released oxygen through photosynthesis and started

accumulating in the atmosphere, . This means light and water are essentials for life to exist. Continued

photosynthesis by such bacteria progressively accumulated oxygen in the atmosphere. Thus the

atmosphere gradually transformed from reducing to oxidizing. At one point of time oxygen content in

the atmosphere become 21%.served as a big trigger for biological evolution to begin and progress and

this led to the invasion of land by living organism.. As time passed, protists evolved from bacteria.

Both bacteria and protists are unicellular. Then came multicellular organisms, the fungi followed by

plants and animals. Today the diversity of living organisms is comprised of five kingdoms of life.

Monera, Prototictista, Fungi, Plantae and Animalia. In brief biotic constituents like plants, animals

and abiotic components like sunlight, water and heat constantly interacting with each other. These are

vital important stages in evolution of human civilization. The Complete Story of Civilization by Will

Durant [1] has represented in the most comprehensive attempt in our times to embrace the vast

panorama of man’s history and culture in 11 volumes. The fossils excavated throw light on the way in

which today’s civilized human came to existence. A team of scientists claim that they have found a

mask depicting an Australopithecus afarensis, a human ancestor that could have possibly given birth

in a way that combines the childbirth practices of chimpanzees and human beings. Now, researchers

claim that this new finding could shed light on how modern human childbirth evolved and paved the

way for large brains. The scientists detailed their findings online 12th April 2017, in the journal The

Anatomical Record. How did materials shape our culture? Stephen Sass, a professor of material

science at Cornell University, first raised this question in brainstorming of his students. This teaching

device embarked him in a long inquiry into the past. Half of the book[2] deals with prehistory and

anthropology from the stone and clay ages to the Roman Empire. As regards the history of materials

science Stone Age prevailed ~500,000 yrs ago, early man used flint, bones and stones. Piltdown man

used stone for knives, axes, and borers ; 100,000 yrs ago [2]. Everything is made out of something.

For example semiconductors, metals, alloys, ceramics, polymers, concretes and so on. If we take

away from our all of the materials from our lives and we are left naked, shivering in a muddy field.

The sophistication of our lives is in a large part essentially borrowed from material wealth. The

fundamental importance of materials is made clear from the naming of ages of civilizations – the

stone, iron and bronze ages – with each new era being brought about by a new material. This 20th

century is often called as the age of silicon, after the breakthrough in materials science that ushered in

the silicon chip and the information revolution. The ages of civilizations are named after materials

precisely because they transformed and shaped society


Keywords: History, Materials science, Civilizations, Earth, Evolutions


[email protected]

Acknowledgement: Author is grateful to Sinhgad Technical Edn. Society’s Founder president Prof.

M.N. Navale, Founder Secretary Dr. Sunanda Navale and Lonavala Campus Director Dr. M.S.

Gaikwad for time to time encouragements.

References:

1. Will and Ariel Durant (Simon & Schuster) ISBN 978-1567310238 1935–1975

2. Sass Stephen L., The Substance of Civilization : Materials and Human History from the Stone Age to the Age

of Silicon. (xii) + 292 pp., illus., bibl. New York: Arcade Publishing,1998.

3. Mark Miodownik, ‘Why the story of materials is really the story of civilization’The Guardian, 14th

Sept.,2014.


Effect of ECR plasma properties on UHMWPE polymer surface suitable

for biomedical application

Supriya E. Morea#

, Jay Daveb, Prajakta Makar

b, Sudha Bhoraskar

a, S. Premkumar

c,

Geetanjali Tomarb*, Vikas L. Mathe

a*

aDepartment of Physics, Savitribai Phule Pune University, Pune 411 007, India

bInstitute of Bioinformatics and Biotechnology, Savitribai Phule Pune University, Pune 411 007, India

cArmament Research and Development Establishment (ARDE), Pune 411 021, India

Abstract The work presented in this study, elucidates the change in surface properties of UHMWPE polymer,

as a result of microwave assisted Electron Cyclotron Resonance (ECR) oxygen and HN plasma. The

ECR plasma properties were optimized to enhance the surface energy and generate C-N/C-O related

functional groups that were found to be associated with enhancement of cellular adhesion. In order to

investigate its application in bone tissue engineering, interactions of modified UHMWPE with one of

the major classes of bone cells viz osteoblasts and osteoclast has been elaborated. The results clearly

indicate a stronger cellular interaction of the polymers treated for 1 min with O2 plasma as compared

to their HN plasma treated counterparts. However, we also emphasize that the type of plasma and the

duration of treatment, play a major role in governing the proliferation and differentiation of a

particular cell type. This means that the duration of plasma treatment governs whether the polymer

surface would support osteoblast or osteoclast differentiation. The confocal microscopy and FE-SEM

shows that polymer surface over which mature osteoblast nodules are grown. The present study is first

of its kind to highlight the culture of two types of bone cells on modified polymer surfaces. The

results provide an overview that 1 min O2 treatment support osteogenesis whereas 2 min O2 treatment

favors osteoclast. The present system provides relatively cleaner environment while considering the

biomedical application.

Figure 1: Schematic representation of surface modification of UHMWPE and culturing of MSCs, osteoblasts

and osteoclasts on the modified surface.

Keywords: non-thermal plasma, Surface energy, Surface roughness, Tissue engineering.


[email protected], [email protected]

Acknowledgement: CSIR-SRF, Dr. Banpurkar, Prof. B. L. V. Prasad

References:

1. S. E. More, P. S. Das, A. Bansode, G. Dhamale, S. Ghorui, S. V. Bhoraskar, V. L. Mathe; Rev. Sci.

Instrument,89,013509 (1-14), (2018)

2. R. Morent, N. De Geyter, J. Verschuren, K. De Clerck, P. Kiekens, C. Leys; Surf. Coatings Technol.

202, 3427–3449 (2008)

3. G. B. Tomar, R. K. Srivastava, N. Gupta, A. P. Barhanpurkar, S. T. Pote, H. M. Jhaveri, Biochem.

Biophys. Res. Commun. 393,377–383 (2010)

mailto:[email protected]



Electrically Conductive Carbon-based Wearable Sensors for Artificial

Human-Machine Intelligence Systems

Dhanashri Gaikwadp, Rahul Bakolia, Shivashish Kulshreshtha

b, Ramadoss

Marimuthub, Bharat B. Kale

b and Arul Kashmir Arulraj*

a Department of Physics, B.P.H.E. Society's Ahmednagar college, Ahmednagar, Maharashtra,India

bCentre for Materials for Electronics Technology, Panchwati, Pune-411008, Maharashtra, India

*corresponding author Email: [email protected]

Abstract

Wearable and flexible sensors with high sensitivity and ultrafast response have been extensively

studied. However, low cost, easy and bulk production with the high performance of such systems still

remain challenging. In this study, polymer loaded carbon-based conducting inks with good

printability and electrical performance have been developed, which can be printed on flexible

Polyethylene Terephthalate (PET) substrates to fabricate strain sensor devices. The devices have

shown good electrical conductivity, high sensitivity towards various bending angles (45o to 180

o) with

fast response time (~0.2 s). The sensing mechanism is investigated by correlating the resistivity with

respect to surface textures and crack formation on flexible carbon electrodes using scanning electron

microscopic analysis. Further, we have straddled these sensor strips on a glove and interfaced using

Arduino with a computer to display the hand signs into readable texts (messages) to demonstrate the

flexible carbon-based wearable sensors for human-machine interconnected intelligence systems. The

developed devices could be a potential alternative for developing the artificial human-machine

systems, virtual keyboards and communication systems.

The real-time performance of hand signs to message conversion strain sensor devices

displaying the word “OCAL” upon corresponding hand gestures.

Keywords: Wearable electronics, Human-Machine Intelligence, conducting carbon, crack induced sensors,

flexible electronics


Effect of plasma parameters on the morphology and electron emission

properties of nanocrystalline LaB6 particles.

S. A. Kamble1, Kashmira Harpale

1, S. R. Bhopale

1S. Ghorui

2, D. Bhatacharjee

3, S. V.

Bhoraskar1, M. A. More

1, V. L. Mathe

1*

1Department of Physics, Savitribai Phule Pune University, Ganeshkhind Pune 411 007.

2Laser and Plasma Technology Division, Bhabha Atomic Research Center (BARC), Trombay,

Mumbai 400 085. 3Electron Beam Facility, Kharghar, Mumbai 410210.

Abstract Lanthanum hexaboride is well known material for its electron emission applications in electron

microscopes, electron guns, x-ray tubes, plasma thrusters, accelerates etc.[1] It possesses high

hardness, high mechanical strength, low work function and refractory nature on the virtue of chemical

and physical properties. LaB6 had been synthesized using different routes such as xenon arc image

method [2],solid state reaction route [3], low temperature flask method [4], calciothermic reduction

using mechanochemistry, acid leaching[5] and chemical vapour growth[6]etc. Most of these methods

results in formation of unavoidable secondary phase of LaB4 along with LaB6. Arc plasma gas phase

condensation route is advantageous to form pure nanocrystalline powders of LaB6. Apart from this is

physical route of synthesis which gives high yield of production. Purity depends on precursor

materials as no additional chemicals are use in the process. Properties of the products i.e. morphology,

particle size distribution etc. depends on the temperature profile of the plasma plume. It is easy to vary

different plasma parameters such as plasma pressure, plasma power and ambient gas during the

synthesis to alter temperature profile of plasma. Present work based on the study effect of plasma

power as well as ambient gas on morphology and electron emission properties of synthesized

nanocrystalline LaB6 particles. These also include in-depth characterization of the synthesized product

using X-Ray diffraction, x-ray photoelectron spectroscopy, and Raman spectroscopy and transmission

electron microscopy. Moreover, electron emission properties of few optimized products are also

carried out.

Keywords: Lanthanum hexaboride, electron emission, arc plasma

Presenting author: [email protected]

Corresponding author: [email protected]

References:

[1] J. M. Lafferty, “Boride Cathodes,” J. Appl. Phys., vol. 22, pp. 299–309, 1951.

[2] T. Aida and T. Fukazawa, “Subgrains in LaB6 crystals grown with a xenon arc image furnace,” J. Cryst.

Growth, vol. 80, no. 1, pp. 9–16, 1987.

[3] Y. Yuan, L. Zhang, L. Liang, K. He, R. Liu, and G. Min, “A solid-state reaction route to prepare LaB6

nanocrystals in vacuum,” Ceram. Int., vol. 37, no. 7, pp. 2891–2896, 2011.

[4] T. M. Mattox, A. Agrawal, and D. J. Milliron, “Low Temperature Synthesis and Surface Plasmon

Resonance of Colloidal Lanthanum Hexaboride (LaB6) Nanocrystals,” Chem. Mater., vol. 27, no. 19,

pp. 6620–6624, 2015.

[5] D. Ağaoğulları, Ö. Balcı, M. L. Öveçoğlu, and İ. Duman, “Preparation of LaB6 Powders via

Calciothermic Reduction using Mechanochemistry and Acid Leaching,” KONA Powder Part. J., vol. 33,

no. 0, pp. 203–218, 2016.

[6] S. Motojima, Y. Takahashi, and K. Sugiyama, “Chemical vapor growth of LaB6 whiskers and crystals

having a sharp tip,” J. Cryst. Growth, vol. 44, no. 1, pp. 106–109, 1978.


Tuning the self-organization of confined active particles by the steepness of

the trap

Md. Samsuzzaman


Abstract

We consider the collective dynamics of self-propelling particles in two dimensions. They can align

themselves according to the direction of propulsion of their neighbours, together with small rotational

fluctuations. They also interact with each other via soft, isotropic, repulsive potentials. The particles

are confined in a circular trap. The steepness of the trap is tuneable. The average packing fraction of

the particles is low. When the trap is steep, particles flock along its boundary. They form a polar

cluster that spreads over the boundary. The cluster is not spatially ordered. We show that when the

steepness is decreased beyond a threshold value, the cluster becomes round and compact and

eventually spatial order (hexagonal) emerges in addition to the pre-established polar order. We

investigate the kinetics of such ordering. We find that while rotating around the centre of the trap

along its circular boundary, the cluster needs to roll around its centre of mass to be spatially ordered.

We have studied the stability of the order when the trap is suddenly switched off. We find that for the

particles with velocity alignment interaction, the decay of the spatial order is much slower than the

particles without the alignment interaction.


Photoluminescence intermittency and time dependent spectral blue shift in

individual CsPbBr3 quantum dots

Mohammed Abdul Haque, Shailaja Mahamuni, S.D. Sartale

Single Qauntum Dot Spectroscopy Lab ,Department of Physics

Savitribai Phule Pune University, Pune-411007.

Abstract

Highly luminescent CsPbBr3 perovskite quantum dots (PQDs) are promising candidate for photonic

and optoelectronic application owing to their excellent light emitting capacity. Despite being emitter

with near unity quantum yield, time dependent intensity fluctuations (intermittency or blinking) at

single particle level limits their use where continuous emission is required. In this work we record the

time dependent spectra and photoluminescence blinking of CsPbBr3 PQDs of size ~5 nm. The PQDs

show time dependent spectral bluing under continuous laser illumination when directly coated on the

cover slip. On the other hand, stable emission spectra were obtained for PQDs embedded in

polystyrene (PS) polymer. Our study highlights the importance of polymer matrix in general and of

PS in particular for CsPbBr3 single particle studies.

Keywords: single quantum dots, photoluminescence blinking, CsPbBr3 PQDs


Ammonia sensor based on modified V2O5 nanostructures

Shobha Birajdar#, Sulabha Kulkarni, Parag Adhyapak*

Centre for Materials for Electronics Technology (C-MET), Panchawati, off Pashan Road,

Pune 411008, India.

Abstract

Vanadium pentoxide (V2O5) has been synthesized by using hydrothermal method and Ru

nanoparticles were decorated on V2O5 surface with different percentage loading (viz. 0.5%, 1%, 3%

and 5% of Ru) by wet impregnation method. The as synthesized and Ru loaded V2O5 samples were

tested for their gas sensing response at different temperature such as 30oC (RT), 50

oC, 100

oC. At

room temperature the 1%Ru@V2O5 showed maximum sensitivity towards ammonia gas which was

found to be reduced at higher temperature. The 1%Ru@V2O5 exhibited remarkably shorter response

and recovery time of 2 s and 12 s respectively and can sense ammonia up to 10 ppm. Thus fabricated

sensor works at room temperature and has a linear response which can be suitable for device

application. The high selectivity of material as compared to pristine V2O5 is due to dissociation of

atmospheric water molecule present on 1%Ru@V2O5 than that of pristine V2O5 which makes

availability of hydrogen atoms on Brönsted sites for ammonia adsorption. The sensing mechanism

and detailed sample characterization viz. XRD, SEM, TEM, XPS, UV-visible spectra is also

elaborated.

Figure 1. Sensitivity of different gases and VOCs towards pristine and Ru loaded V2O5.

Keywords: ammonia, vanadium pentoxide, ruthenium, room temperature, gas sensor



References:

1. I. Raible, M. Burghard, U. Schlecht, A. Yasuda, T. Vossmeyer, Sensors Actuators B Chem. 2005, 106,

730

2. P. V. Adhyapak, A.D. Bang, P. More, N.R. Munirathnam, RSC Adv. 2018, 8, 34035


Temperature Dependent Raman-active Optical Phonons driven low

thermal conductivity of PbBi2Se4

Rahul A. Ahera, Prashant Vijay Gaikwad,

b, c Mohit Prasad,

a Anjali Kshirsagar

b, c and

Sandesh Jadkar *a,b

a School of Energy Studies, Savitribai Phule Pune University, Pune-411007, India. b Department of Physics, Savitribai Phule Pune University, Pune-411007, India.

c Centre of modeling and Simulation, Savitribai Phule Pune University, Pune-411007, India.

Abstract

We are reporting the temperature dependent Raman study of solvothermally grown layered PbBi2Se4

composite over a low (83- 303K) and high (303–583K) temperature range. Analyzing variant

temperature dependence of modes occurring at 131 cm-1

(E2

g mode) and 171 cm-1

(A21g mode), we

have calculated thermal conductivity of layered PbBi2Se4 composite which is 10-11 Wm-1

K-1

, found

significantly low. The obtained material is investigated using XRD, TEM, FESEM, FTIR and DRS

spectroscopy. The optically active phonon E2

g and A2

1g mode shifts evidentially with variation in

temperature. Analysis of anharmonicity and lifetime of the phonon is carried out by observed red shift

in the Lorentzian peak position and FWHM of the asymmetric lineshape of both the modes. We have

recorded Raman profile for the PbBi2Se4 composite at different laser power. The observed shift in the

E2g and A

21g phonon mode is due to localized heating effect. We have also performed DFT based first

principles calculations for 3x3x1 supercell septuple of PbBi2Se4 to substantiate our experimental

results. Phonon partial density of states calculations shows that higher frequency optical modes are

governed by lighter Se atom whereas Pb and Bi promote lower frequency phonon mode. We have

calculated the thermal conductivity (K), Lattice thermal conductivity (KL), Lorentz number (Lo),

Thermal diffusivity (D) and Thermal effusivity (e). Our work may provide an efficient method to

estimate thermal conductivity of layered material and can also help in tuning it by exploring the

phonon dynamics as a function of temperature.

Figure 1(a) XRD Plot of PbBi2Se4 composite. (b) And (c) FESEM images of the PbBi2Se4

nanoflower. (d) and (f) are the TEM images of the PbBi2Se4 composite. (e) HRTEM and (g)

SAED image of the PbBi2Se4 composite.

Keywords: Layered materials, PbBi2Se4 Nanosheets, Raman Spectroscopy, phonons

vibration, thermal conductivity.

: Presenting author: [email protected]*:



References:

1. M.G Kanatzidis, Acc. Chem. Res., vol. 38, no. 4, pp. 361–370 (2005). Structural Evolution and Phase

Homologies for “Design” and Prediction of Solid State Compounds,

2. Chung, D. Lane, M.A. Ireland, Mater. Res. Soc. Symp., vol. 626, pp. Z7.4.1– Z7.4.6 (2000).

Compositional and Structural Modifications in Ternary Bi Chalcogenide and Their Thermoelectric

Properties

3. L. E. Shelimova, O. G. Karpinskii and V. S. Zemskov, Inorganic Materials (ISSN 0020-1685), Vol. 44,

927–931(2008). X-ray Diffraction Study of Ternary Layered Compounds in the PbSe–Bi2Se3 System

4. S. Sassi, C. Candolfi , G. Delaizir, S. Migot, J. Ghanbaja, C. Gendarme , A. Dauscher, B. Malaman, and

B. Lenoir, Inorg. Chem, 57, 422−434 (2018). Crystal Structure and Transport Properties of the

Homologous Compounds (PbSe)5(Bi2Se3)3m (m = 2, 3)

5. A Chatterjee., S.N.Guin, K.Biswas , Phys Chem Chem Phys, 16 (28), 14635-9 (2014),. Ultrathin

septuple layered PbBi2Se4 nanosheets.


FA–Cur@Au-PVP Nanoprobe Mimicking Peroxidase Activity: A Step

towards Developing Colorimeteric Biosensor

Sneha Mahalunkar1, Suresh W. Gosavi

1, 2*

1School of Basic Medical Science, Savitribai Phule Pune University, Pune, 411007. Maharashtra,

India. 2Department of Physics, Savitribai Phule Pune University, Pune, 411007. Maharashtra, India.

Abstract

Background

To overcome the obstacle of conventional medicine formulations and their dosage, which are

associated with various limitations like drug insolubility, reduced bioavailability, site specificity

which in turn affects their efficacy has given a chance for the field of nanomedicine to offer novel

drug delivery strategies which have in turn acquired tremendous attention especially in the area of

cancer therapy 1. Cancer is one of the leading causes of mortality in the world. Chemotherapy and

radiotherapy have been used as an efficient treatment for cancer in most of the clinics and hospitals

till date. However, there are many other anticancerous drugs which have their own limitations when

administered directly into the body. Thus, conjugating anticancerous drugs with the nanocarriers

including magnetic nanoparticles2, 3, 4

, silica nanoparticles5, gold nanoparticles

6 and inorganic

nanoparticles can be an alternative to traditional systems in case of cancer diagnosis and treatment.

Curcumin, on the other hand has been widely used owing to its various medicinal properties including

antitumor effects. However, its clinical application is limited by its instability, poor solubility and low

bioavailability. Folic acid (FA)-functionalized nanoformulations may enhance the sustained release of

an anticancer drug (curcumin) by tumor-specific targeting to improve therapeutic benefit. The design

of a nanoconjugate (NC) comprised of folate–curcumin-loaded gold–polyvinylpyrrolidone

nanoparticles (FA–CurAu-PVP NPs) for targeted delivery in breast cancer model systems is a boon in

the field of cancer. Fabrication of a devise using such nanoconjugates is in great demand and has a

huge industrial application in order to commercialize the device and getting it in market. This work

will make cancer detection as easy as checking body’s blood sugar level.

Methods

We developed FA–CurAu-PVP NPs NCs by layer-bylayer assembly. The P NCs were characterized

by ultraviolet–visible spectra, Fourier transform infrared spectroscopy, X-ray powder diffraction and

thermogravimetric analysis. In vitro anticancer and antimigratory effects of NCs were examined by

performing MTT and wound migration assays. The in vivo antitumor efficacy of NCs was

investigated using a preclinical breast cancer orthotopic mouse model.

Results

Folate and Curcumin (40 μg/mL) was loaded along with conjugation of folate onto Au-PVP NPs to

form FA–CurAu-PVP NCs. The size and charge of the NCs were increased gradually through layer-

by-layer assembly and showed 80% release of curcumin at acidic pH (intracellular pH of cancer cells

is acidic). The MTT data using these NCs showed efficient anticancer activity at lower doses in

estrogen/ progesterone receptor (ER/PR)-negative cells compared with ER/PR-positive cells.

Furthermore, the NCs did not show cytotoxicity at the investigated concentration in human breast

epithelial and mouse fibroblast cell lines. They showed inhibitory effects on cell migration and high

antitumor efficacy in in vivo analysis. The NC did not show aggregation when incubated with human

serum and mimicked an intrinsic peroxidase-like property in the presence of 3,3ʹ,5,5ʹ-

tetramethylbenzidine substrate. Due to which the NCs thus fabricated can function as an effective

device to detect cancer cells and differentiate them from normal cells.


Conclusion

These results suggest that folate-based tumor targeting using CurAu-PVP NCs is a promising

approach for tumor-specific therapy of breast cancer without harming normal cells.the mimetic

phenomenon of the NC also make them a model to develop a device which can help to detect cancer

cells or tissues and it can be monitored with naked eye due to colour change.

Acknowledgement and Industry collaboration :

The above described work is done in Department of physics, SPPU under the mentorship of Prof.

S.W.Gosavi , with the financial assistance from DST/ Inno-Indigo project in collaboration with

NCCS, India; MHH, Germany and University of Oslo, Norway. This project also has a tie-up with

Seagull BioSolutions Pvt. Ltd company who are interested to take up the developed product for

commercialization.

References:

1. Ahmed M.Faheem, Dalia H.Abdelkader, “1 - Novel drug delivery systems”, Engineering

Drug Delivery Systems, (2020), Pages 1-16.

2. H. Gandhi, A. K Sharma, S. Mahant & D. N Kapoor, Therapeutic Delivery, Vol.1, No.2,

(2020).

3. S. Saifullah, I. Ali, M. Kawish, R. M.El-Shabasy, L. Chen, H. R.El-Seedi, Metal

Nanoparticles for Drug Delivery and Diagnostic Applications, Micro and Nano Technologies,

Pages 215-236, (2020).

4. M. Hepel, Magnetochemistry , 6(1), 3, (2020).

5. P. Pant, C Gupta, S. Kumar, A. Grewal, S. Garg, A. Rai, J. Mat. NanoSci., 7(1), 1‐18 (2020).

6. Sneha Mahalunkar, Amit Singh Yadav, Mahadeo Gorain, Vinay Pawar, Ranveig Braathen,

Siegfried Weiss, Bjarne Bogen, Suresh W Gosavi, and Gopal C Kundu, “Functional design of

pH-responsive folate-targeted polymer-coated gold nanoparticles for drug delivery and in

vivo therapy in breast cancer”, Int J Nanomedicine. (2019) ; 14: 8285–8302.

https://www.future-science.com/doi/abs/10.4155/tde-2019-0077




https://www.sciencedirect.com/science/article/pii/B9780128169605000124#!






https://www.sciencedirect.com/science/book/9780128169605

https://www.sciencedirect.com/science/book/9780128169605

https://www.ncbi.nlm.nih.gov/pubmed/?term=Mahalunkar%20S%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Yadav%20AS%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Gorain%20M%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Pawar%20V%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Braathen%20R%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Weiss%20S%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Bogen%20B%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Gosavi%20SW%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pubmed/?term=Kundu%20GC%5BAuthor%5D&cauthor=true&cauthor_uid=31802866

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6801194/


Possibility of topological properties in 2D cadmium chalcogenide (CdX, X =

S, Se, and Te) buckled honeycomb monolayer on substitutional doping

Sutapa Chattopadhyay and Anjali Kshirsagar

Department of Physics, Savitribai Phule Pune University

Abstract

Two-dimensional honeycomb monolayers doped with tin atoms are designed from (111) surface of

bulk zinc blende structures of cadmium chalcogenides using first principles density functional theory

based calculations. On relaxation the buckled honeycomb monolayer shows signature of band

inversion between Sn and Cd orbital at the zone center (Γ point) deep in the valence band and high

above in the conduction band. The band inversion, due to hybridization, stays even after inclusion of

spin-orbit coupling. The systems were chosen with an intention to exploit the possibility of d d band

in-version. CdSnS has s-s band inversion but CdSnSe and CdSnTe monolayers do show band

inversion involving d states. The calculated phonon spectra confirmed the stability of all the systems

studied. The details of the electronic structure bring out the importance of s-d band inversion. We also

report the topological invariants and analysis of edge state properties and band structure of these

materials in ribbon geometry. Such systems can be useful for technological application in the

Spintronic domain

Raman Memorial Conference - 2020 PP-01

Phosphonium Based Ionic Liquid Catalysed One Pot Synthesis of

Dihydropyrimidines

Aafaq A. Tantray,# Santosh S. Terdale*

Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind,

Pune-411 007, Maharashtra, India *E-mail: [email protected]. Tel: 020- 25601395 ext. 604.

Abstract

Here, we describe the synthesis and chracterization of phosphonium based ionic liquid and its use as a

catalyst in multicomponent reactions for one pot synthesis of 3, 4-dihydropyrimidine derivatives from

various aromatic aldehydes, β-keto ester and urea or thio-urea under solvent-free conditions at 120 oC.

The different derivatives of 3, 4-dihydropyrimidines have been synthesized with excellent yields.All

the synthesized product were characterized by spectroscopic techniques such as 1H-NMR,

13C-NMR

and FT-IR. The advantage of this method is a solvent free condition, requirement of small amount of

catalyst, shorter reaction time, easy workup procedure and also the reaction does not contain any

hazardous organic solvent and toxic catalyst.

Keywords: phosphonium based ionic liquid, dihydropyrimidine, multicomponent reactions.

OR2

O OR1-CHO

H2N NH2

X

NH

NH

X

R1O

120 0C

10 mol % R2OPBIL

#: Presenting author: [email protected]*: Corresponding author: [email protected]



Factors that Influence the Performance of Cadmium Sulphide

Sensitized Zinc Oxide Photoanode for Solar Cell application

Abhijit T. Supekara,b

, Pankaj K. Bhujbalb , Sopan M. Rathod

a and Habib M. Pathan

b *

aDepartment of Physics, Abasaheb Garware Ars and Science College , 411007

b Advanced Physics Laboratory, Department of Physics

Savitribai Phule Pune University, Pune - 411007, India

Abstract

Quantum dot sensitized Solar Cell (QDSSC) has several advantages like constant power output,

tunable energy band gap, high absorption coefficient, generation of multiple electron-hole pair with

high energy excitons [1-2]. The present work demonstrates that various factors affect the performance

of Cadmium Sulphide sensitized Zinc Oxide photoanode for solar cells. There are total three

parameters are studied in this whole research work i.e. thickness of photoanode, a number of SILAR

cycles and the role of the counter electrode on the performance of the solar cell. In this work, the pre-

coated ZnO compact layer is important for avoiding back contact, which is deposited by simple

chemical bath deposition, by using Zinc Nitrate and 25% NH4OH solution in distilled water. ZnO,

film is deposited by Doctor Blade method on Fluorine doped Tin Oxide substrate. The prepared films

were annealed at 450 C for one hour and sensitized with cadmium sulfide quantum dots by the

Successive Ionic Layer Adsorption Reaction method [3]. An optical, structural, and morphological

property of ZnO photoanode has been studied. I-V characteristics of the sandwiched solar cell are

measured with various counter electrodes (CuS, C, CuSe).

Figure: IV characteristic of CdS sensitized ZnO (2 layers and 8 SILAR cycles) with CuS

counter electrode)

Keywords: CdS QDs, Counter Electrode, SILAR

a: Presenting author:[email protected]

References:

1. M. Gratzel Nature 414 , 338,(2001)

2. Özgür Ü, Alivov YaI., Liu C, Teke A, Reshchikov MA, Doğan S, Avrutin V, Cho SJ, and

Morko H A J. Of Appl. Phy. 98,41301-70 (2005)

3. Chang CH, Leea YL, Appl. Phy. Lett. 91,53503-53505. (2007)


Radiation Detectors

Amey Rodge*, Bedangadas Mohanty

# and Ramchandra Narhe

*

*Department of Physics, Fergusson College, Shivajinagar, Pune – 411004,

#National Institute of Science Education and Research, Bhubaneswar – 752050

Abstract:

Radiation detectors are used in various walks of life in nuclear/particle research facilities to hospitals.

The most familiar particles we encounter are the alpha, beta and gamma. There are however, other

kinds of particles such as neutrons and muons that are found in nature but may not be so familiar.

Radiation and particle detectors exploit the interaction properties of incoming radiation or particle

with a material which may be a gas, liquid or solid to obtain electrical signals. Gas detectors are

among the simplest detectors widely used as radiation monitors in industries, research facilities and

hospitals. G.M. counter is a well-known gas detector. G.M. counter is an instrument developed by

Geiger and Walter Muller (in 1928) which is capable of detecting the ionizing radiations such as alpha

particles, beta particles and gamma rays using the ionization effect produced in G.M. Tube. It is based

on the principle of Townsend Avalanche, that is in the presence of strong potential difference, a

particle which causes ionization in gaseous molecules can lead to an avalanche of secondary

ionizations that results in a sudden discharge, and therefore detection of particle. Using the G.M.

counter, various experiments have been performed to understand the physics of particles and gaseous

detectors. Further, moving on to the Scintillation detector, it uses Scintillation properties of the

material to detect the radiations. The characteristics of scintillation detectors have been studied and

compared with that of the G.M. counter. Plastic scintillator has been used to detect cosmic muons and

its efficiency for detecting cosmic muons has been determined.


*Corresponding author: 1. [email protected]

2. [email protected]

References:

1. Glenn F. Knoll, Radiation detection and measurement, John Wiley & Sons, Inc., 4th

edition, 2010.

2. W. R. Leo, Techniques for Nuclear and Particle Physics Experiments, A how to

approach, John Wiley & Sons, Inc., 2nd

edition, 2010.


Size dependent Stokes nhift in CsPbBr3 perovskites nanocrystals

Amruta A Lohar, Aparna Shinde and Shailaja Mahamuni*

Department of Physics, Savitribai Phule Pune University, Pune – 411007, India

Abstract

Cesium lead halide perovskites (CsPbX3) nanocrystals (NCs) exhibit high photoluminescence

quantum yield (PLQY) near to 40 - 90 %, and narrow emission line width (70 – 140 meV). Its band

gap can be tuned with varying size and compositon. [1] These NCs acquire such high PLQY without

electronic surface passivation, which is necessary for chalcogenide quantum dots (QDs). The high

PLQY is due to the defect tolerant nature of its electronic band structure. [2]

Specifically, these perovskites show Stokes shifts i.e. a difference exists between absorbing

and emitting states. For CsPbBr3 NCs, the Stokes shift varies with the size of these NCs. CsPbBr3

NCs Stokes shift ranges from 70 to 10 meV having cube edge length or size between ~ 4 to 10 nm

respectively. Even such Stokes shift is observed in CdSe quantum dots (QDs), where Stokes shift

range from ∼100 to 10 meV for particles with diameters between ∼1 and 5 nm, respectively. In these

QDs Stokes shift originate from the existence of band edge excitonic fine structure. [3]

The experimental results are analysed on the basis of the published theoretical calculations

indicating the existence of an intrinsic confined hole states above valence band edge for NCs with

edge lengths from ∼2 to 5 nm. This hole state acts as a dark state in absorption and bright in

photoluminescence due to its low population density. The experimental findings are also compared

with the sp3 chalcogenide NCs.

Figure 1: (a) Stokes Shift representation (b) Size-dependent Stokes shifts.

Keywords: CsPbBr3 Nanocrystals, Stokes Shift.


[email protected]

Acknowledgement: AL acknowledges UGC-DAE CSR, Indore for financial support.

References:

3. Loredana Protesescu, Sergii Yakunin, Maryna I. Bodnarchuk, Franziska Krieg, Riccarda Caputo,

Christopher H. Hendon, Ruo Xi Yang, Aron Walsh, and Maksym V. Kovalenko; Nano Lett., 15,

3692−3696 (2015)

4. Javad Shamsi, Alexander S. Urban, Muhammad Imran, Luca De Trizio, and Liberato Manna; Chem.

Rev., 119, 3296−3348, (2019)

5. Michael C. Brennan, Jessica Zinna, and Masaru Kuno; ACS Energy Lett. 2, 1487−1488 (2017).


Effect of Mn3O4 Nanoparticles on neuroblastoma cell (SHSY5Y)

Anuradha Beedkara, Gauri Kulkarni

b

a,bBiophysics Laboratory,School of Basic Medical Sciences,University of Pune,Pune-411007

Abstract:

Neuroblastoma cells are cancerous cells of nervous system. The SH-SY5Y cell line has been used

widely in experimental neurological studies, including analysis of neuronal differentiation,

metabolism, and function related to neurodegenerative processes, neurotoxicity, and neuroprotection.

The effect of many nanoparticles like Zinc oxide(ZnO), Titanium oxide(TiO2), Iron oxide(Fe3O4),

Silver, Gold ,Quantum dots on SH-SY5Y cells have been studied. Recently, manganese oxide

nanoparticles have been tried for its antineuroblastoma activity. Mn3O4 nanoparticles are important

form because of its superior electrochemical properties. In the present work, effect of Mn3O4

nanoparticles on SHSY5Y neuroblastoma cell line is studied. SHSY5Y cell line was treated with

different concentrations of Mn3O4 nanoparticles for 24 hours. Toxicity of Mn3O4 Np was quantified

by MTT assay, apoptosis assay and microscopy. It was observed that Mn3O4 nanoparticles cause

apoptosis to SHSY5Y cell line and cell viability decreases with increasing concentrations of

nanoparticles.



Acknowledgement: Authors thanks to the School of Basic Medical Science, University of

Pune for providing funds.

References:

1.Ga´bor Oszla´ nczi , T¨undeVeze´ r , LeilaSa´ rk ¨ ozi , EndreHorva´ th , Zolta´nKo´ nya , Andra´ s Papp ,

Ecotoxicology and Environmental Safety73(2010)2004–2009

2. Hilary AfesehNgwa, ArthiKanthasamy, Yan Gub, Ning Fang, Vellareddy Anantharam,and Anumantha G.

Kanthasamy. USAToxicolApplPharmacol. 2011 November 1; 256(3): 227–240. doi:10.1016/j.taap.2011.07.018.



Polarized emission in CsPbBr3 quantum dots

Aparna Shindea, Richa Gahlaut

a, Abharana N

b, Dibyendu Bhattacharyya

b and Shailaja

Mahamunia,

aDepartment of Physics, S. P. Pune University, Pune 411007, India

bAtomic and Molecular Division, Bhabha Atomic Research Centre, Mumbai 400085, India

Abstract

CsPbBr3 nanocrystals (NCs) due to their extraordinary photoluminescence quantum yield and

photostability without any inorganic passivation (core-shell) make them probable candidate for LED

and LASER applications. Additionally, the polarized luminescence of these NCs in ensemble

broadens the field of applications, especially in liquid crystal display. Here, we report polarized

emission property of CsPbBr3 nanocubes with varying sizes of NCs. With decreasing size of

nanocrystals, degree of emission polarization increases unprecedentedly. Different experimental

configurations are used to study the transition dipole moments of CsPbBr3 NCs and unexpectedly it is

observed that the transition dipole moments of absorption and emission are non collinear.

: Presenting author: [email protected]

: Corresponding author: [email protected]

Acknowledgement: A.S. thanks Savitribai Phule Pune University, Pune, India and Women

Scientist Programe, DST, and CSIR New Delhi for financial support. R.G. thanks UGC, New

Delhi for Dr. D. S. Kothari Postdoctoral Scheme. S. M. thanks DST Nanomission Programe

for research grant. Thanks to Amruta Lohar and Nidhi Tiwari for EXAFS measurements at

RRCAT, Indore.


Influence of the bath temperature on the properties of CdTe thin films

Aparna Ukarandea, S.Chaure

b and N.B.Chaure

a,

a Electrochemical Laboratory, Department of Physics, Savitribai Phule Pune University, 411007,

b Department of Physics, College of Engineering, Pune, 411005,


Abstract

Cadmium telluride (CdTe) thin films have been prepared by using potentiostatic electrodeposition

technique on to FTO coated glass substrates from an aqueous solution. The cadmium sulphates

(CdSO4), tellurium oxide (TeO2) are used as the source of Cd and Te ions. Citric acid (C6H8O7) was

used as complexing agent to enhance the conductivity of the bath and to obtain the stoichiometric

layers at desired potentials. A conventional three electrode geometry was employed for the deposition

of CdTe layers. Transparent conducting fluorine doped tin oxide (FTO), graphite and Ag/AgCl were

used as working, counter and reference electrode, respectively. The deposition potential was

optimized with help of cyclic voltammetry experiment. CdTe layers were electrodeposited at -0.7V.

The effect of bath temperature on the structural, optical and morphology properties was studied. The

deposited samples were annealed in ambient condition at temperature 450˚C for 20 min. The

reflection peaks exhibited around 24°, 39° and 46° are corresponds to (111), (220) and (311) planes

of cubic CdTe. The peaks in XRD spectra associated FTO substrate are marked as solid circle (●).

The degree of crystallinity was found to be enhanced upon heat treatment. Te metallic peak was

observed in an annealed sample for the sample deposited at 70°C, which is probably due to the higher

kinetic energy gained by the Te ions. However, the Te rich layers are good to produce the high

efficiency CdTe based solar cells. Upon annealing the sample deposited at 50°C was without metallic

Te. The Raman results are in good agreement with XRD analysis. The shoulder observed around 263

cm-1

in the sample deposited at 70°C is associated to the tellurium. The estimated energy band gap

value for annealed sample was ~1.45 eV. Uniform, dense and compact morphology were observed

from SEM analysis. Nearly stoichiometric thin films were grown at deposition potential -0.7 V.

Figure: SEM images of CdTe thin films of as deposited (a) and annealed samples (b).

Keywords: Cadmium telluride (CdTe), Electrodeposition, Thin films, Characterization.



Acknowledgement: We are thankful to the IUC, UGC-DAE, and DST (SERB) for financial

support

References: 1. Jun Wang, Shurong Liu et. al. Journal of Alloys and Compounds, 18, 8388 (2018).

2. I. M. Dharmadasa1, O. K. Echendu, et. al., J Mater Sci: Mater Electron 28, 2343–2352, (2017).

3. F. de Moure-Flores, J. G. Quiñones-Galván, et. al., Journal Of Applied Physics 112, 113110 (2012).

(a) (b)


Ag nanoparticles grown on different substrates by SILAR method for

SERS application

Aqsa Shaikh, Imran Shaikh and Shrikrishna Sartale*


Savitribai Phule Pune University, Pune 411 007, India.


Abstract

When a Raman active molecule placed in the vicinity or get adsorbed on the surface of the plasmonic

metal nanoparticles, its Raman scattering intensity get enhanced, this phenomenon is called as Surface

Enhanced Raman Scattering (SERS). SERS technique emerged as a powerful tool for analyzing and

detection of various Raman active molecules in trace amount due to its properties like highly sensitive

and finger printing of molecules. Ag nanoparticles are known for its large SERS enhancement due to

its narrow plasmonic width in visible range. Successive ionic layer adsorption and reduction (SILAR)

method is a simple and low cost method use to grow various metal/metal oxide nanoparticles. In

SILAR method, metal ions get adsorbed on the surface of substrate immersed in the metal ion solution

and then immersed in the reducing agent solution in order to grow metal nanoparticles. Substrate is

rinsed with double distilled water (DDW) between adsorption and reduction steps to remove the

loosely bound species. In SILAR method any type of substrate with different shape and size can be

used to grow the metal nanoparticles. In this work low cost substrates like glass, cloth, paper, stainless

steel and mesh are utilized to grow Ag nanoparticles using SILAR method. Above mentioned

substrates are economical and flexible which can be used as potential platforms for the growth of Ag

nanoparticles and its application to the SERS.


Electrically Conductive Carbon based Inks for Developing the Wearable

Smart Sensors

Arya Ajeeva,b, #

, Ashik Alia,b

, Mrudul Modakb, Shreya Patil

b and Arul Kashmir

Arulraja*

a Department of Polymer Engineering, University College of Engineering, Thodupuzha-685587,

India. b Centre for Materials for Electronics Technology, Panchwati, Pune-411008, Maharashtra, India

*corresponding author Email: [email protected] #Presenting author Email: [email protected]

Wearable and flexible sensors with high sensitivity and ultra fast response have been extensively

studied. However, low cost, easy and bulk production with the high performance of such systems are

still remain challenging. In flexible electronics, the processing and designing are generally time

consuming and cost effective. Conventionally, the flexible electrical circuits are made using

lithographic and lift-off methods which are highly unreliable and unaffordable for the large scale

device fabrication. To address this issue, we have developed the conducting ink using carbon with

polymer additives (PVP, Pluronic F127, Poly aniline, PEDOT:PSS) that can be used to draw the

circuits on various substrates like latex based rubber, PET films and paper. These printed lines has

shown appreciable conductivity even under stress with less change in resistance (k Ohms) makes

suitable for developing a wearable sensor systems. With this ink, we were able to fabricated the

flexible, wearable glove that can sense the wide range of pH (1 to 14) along with the physiological

motions and gestures analysis (stress-strain sensors). These integrated sensor devices have shown

good electrical output switching between flexing and resting states in addition with high pH

sensitivity. Further, we have attempted to develop the proto-type modules of this smart sensors by

interfering the devices with Arduino circuit. Using the Arduino circuits, the analog signals have been

converted into digital and readable that corresponds to the physical motion and pH variations. This

expedient sensing could offer a smart wearable sensor system that can ameliorate the future

electronics device applications in developing flexible RFID and NFC tags, human robotics, sensors

etc,

Keywords: Wearable electronics,conducting carbon, lithography,human robotics


An overview of NTC Thermistor For Temperature Sensing Application

* Ashik Ali*, Anamika Pund#, Govind Umarji#, Manish Shinde#, Ramadoss

Marimuthu#, Sudhir Arbuj#, Sunit Rane#

* University College of Engineering, Thodupuzha, Kerala, India

# Centre for Materials for Electronics Technology, Pune, India

Abstract

There are many potential applications for NTC thermistors. Their accuracy and stability make them

highly useful for a wide range of purposes. These applications include temperature measurement,

compensation, and control.NTC thermistor probes are generally used as resistance thermometers.

They are extremely versatile and accurate, which makes them ideal for a wide variety of applications

that measure temperature, .thermistor probes work especially well for lower range of

temperatures.There are many automotive and transportation, and military applications for NTC

thermistor probes, including industrial process controls, emissions controls, and differential

temperature controls. Thermistor probes can be used in automobile and truck tire curing, as well as

for monitoring and controlling engine temperatures. They are even used in missiles and

spacecraft.Some more potential equipment uses of NTC thermistor probes are for plastic laminating

and hot glue, as well as fire protection and safety. Copy machines and industrial soldering irons both

use NTC thermistor probes. Hot mold and chemical analysis equipment is another potential

application for NTC thermistor probes.Other uses for NTC thermistor probes range from applications

for sensor assemblies and industry to telecommunications, as well as many kinds of medical,

laboratory, and scientific instruments and testing. They are used in fiber and photographic processing,

solar, meteorological, geological, and oceanographic research equipment, as well as consumer and

household appliances.You may well already have NTC thermistor probes being used in your burglar

alarm and fire detectors, for your oven, air conditioning, refrigerator temperature control, or fever

thermometer. There are more specific applications for NTC thermistor probes that include

bathythermography, calorimetry, titration, spectrophotometry, osmometers, bolometry, and

thermodilution.Potential instrumentation applications seem endless as well. NTC thermistor

probes can be used for motor winding compensation, transistor temperature compensation, infrared

sensing compensation, gain stabilization and piezoelectric temperature compensation.While the

majority of NTC thermistor applications are based on their resistance-temperature characteristic, they

can also be grouped according to other basic electrical applications. For example, current-time uses

include time delay, surge suppression, and sequential switching. Among the voltage-current uses are

vacuum manometers, anemometers, automatic gain, amplitude and level control, flow meter voltage

regulation, liquid level control and fluid velocity, alarm volume, signal expansion and compression

and thermal conductivity analysis as well switching devices and gas detection.

Figure: (Tube NTC thermistor,Temperature sensing type NTC Thermister)

https://www.ametherm.com/thermistor/pan-series-termperature-sensing-probes

https://www.ametherm.com/blog/thermistors/customization-capabilities-for-ntc-thermistor-probe

https://www.ametherm.com/thermistor/ntc-thermistors-pant

https://www.ametherm.com/thermistor/ntc-thermistors-pant

https://www.ametherm.com/thermistor/select-an-ntc-thermistor


Visible light Photocatalyst for water splitting, Dye degradation and self-

cleaning application

Ashwini Karale

1, Kanchan Berad

1, Mandge Chaitali

1, S. I. Patil

2, S. S.Kekade

1*

1Radhabai Kale Mahila Mahavidyalaya, Ahmednagar, 414001

2Department of Physics, Savitribai Phule Pune University, Pune, 411007,

Abstract In the development of new energy sources, hydrogen is one of the most attractive fuels for the 21st

century. Hydrogen has considerable potential as an alternative fuel, especially if it can be generated

inexpensively from an abundant raw material such as water. However, the efficient photocatalytic

splitting of water to generate hydrogen using sunlight remains an as yet unachieved goal from a

technological standpoint. A number of modification techniques and chemical additives have been

developed in recent years to improve photocatalytic activity of Photocatalyst (e.g. TiO2, ZnO) under

visible light irradiation. Presently, we can directly use the visible light driven Photocatalyst like,

BiVO4, MoSe2, BiWO4 materials for the hydrogen production. The development of better catalysts,

tailoring of electronic structure and the reactivity as well as synthetic methods can be employed for

controlling the morphology of catalysts. It is also going to benefited from recent progress in nano

science. In this section we interested to synthesize the BiVO4, MoSe2 and their composite for

production of hydrogen through water splitting reaction.

Clean water is one of the most important natural resources for human, animals and plants in the

world. With the rapid development of industries like chemical, petrochemical, pharmaceutical,

mining, semiconductor and microelectronic, around the world the need for pure water as well as

purification of contaminated water has increased. Each of these industries requires large quantity of

water for processing and subsequently water discharged from them are contaminated with toxic

organic pollutants. The high population density and the level of industrialization have triggered the

hydrosphere to be polluted with inorganic and organic matter with an increasing rate. Decades of

untreated obnoxious waste disposed off in the land have created a serious ground water contamination

problem due to metal leaching in water. Remediation of such a contaminated soil is an expensive

process and it is highly unlikely that developing countries will have enough resources to ensure

sufficient clean water reserve.

Figure : Mechanism of Photocatalysis1.

Keywords: Bismuth Vanadate, Photocatalyst, Photodegradation, Self-cleaning application.

Corresponding author: [email protected] Acknowledgement: The author is thankful to Department of Physics SPPU, Pune for

experimental support. The author also thank full to Radhabai Kale Mahila Mahavidyala,

Ahmednagar for encouragement and support.

References:

1. Y. Park, K. J. McDonald and K-S Choi, Chem. Soc. Rev. 42, 2321, (2013)

2. A.fujishima, and K. honda Nature, 238, 37-38, (1972)


Hydrothermal synthesis and characterization of Molybdenum disulfide

(MoS2) nanoflowers

Avinash R. Kachere1, Prashant M. Kakade

1, Sachin R. Rondiya

2 , Bharat B. Kale

3,

Adinath M. Funde2, Sandesh R. Jadkar

4, Nandkumar T. Mandlik

1*

1Department of Physics, Fergusson College, Savitribai Phule Pune University, Pune – 411004,

Maharashtra, India. 2School of Energy Studies, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007, India.

3Nanocomposite Laboratory, Center for Mat. for Electronics Tech. (C-MET), Dept. of Electronics &

Info. Tech. (DeitY), Govt. of India, Panchawati, Pune 411 007, India 4Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007, India.

* Corresponding author: [email protected] (NTM), +91 20 67656064.

Abstract

Molybdenum disulfide (MoS2) nanoflowers were successfully synthesized by a facile hydrothermal

method. The products were characterized by X-ray powder diffraction (XRD), Raman Spectroscopy,

Field emission scanning electron microscopy (FESEM) and UV−visible spectroscopy etc. X-ray

diffraction and Raman Spectroscopy results showed that the as-prepared product was the hexagonal

phase of MoS2 without any impurity. FESEM images shows that the MoS2 nanoflowers had uniform

sizes with diameter of about 1 µm – 3 µm. The optical properties and band gap value were

investigated by UV−visible spectroscopy. Finally we conclude that pure MoS2 structure with layered

MoS2 nanoflower like morphology synthesized by simple and efficient method.

Keywords: Molybdenum disulfide, Nanoflowers, Energy storage application.


Flexible POLYANILINE (PANI) based 3 x 3 Active Matrix for

Electrochromic Display Applications

Bharati Wakchaurea #

, Shreya Patilb, Mrudul Modak

b ,Sachin D. Ralegnkar and Arul

Kashmir Arulraj*

a Department of Physics, BPHE society's Ahmednagar College Ahmednagar, Ahmednagar-414001,

India. b

Centre for Materials for Electronics Technology, Panchwati, Pune-411008, Maharashtra,

India

*corresponding author Email: [email protected]

#Presenting author Email: [email protected]

Abstract

Semiconducting polymers like Polyaniline are ideal materials for the flexible electronics due

to there advantages in electrical and mechanical properties, solution process ability with desirable

stability. However, fully printed flexible electrochromic active matrix backplane are still difficult to

realize for the future display and sensing application. Here we report fully printed flexible

POLYANILINE based active matrix electrochromic display fabrication and functioning at low

applied bias i.e. less than 2V. The Polyaniline back plane has shown high electrical performance

with high uniformity in pixel color changes upon applied voltages corresponds to oxidation +0.2V

and reduction -0.6V reversible. The electrochromic display were made into 3x3 active matrix which

is show good switching characteristics, facial manufacturing, and moderate stability. The fabricated

3x3 pixel is interfaced using Arduino with a computer to display the different letters or numbers. The

electrolyte gel optimized towards archiving long term stability is in progress overall, the fully printed

electrochromic display is promising for the large area and low cost flexible display for application

such as medical electronics and smart electronics.

Electrochromic display based on PANI polymer and voltmetric study during oxidation and

reduction

Keywords: Semiconducting Polymer, Flexible Electronics, Voltmetric

Analysis,Electrocromic Display.


Optical effect of cadmium sulphide sensitized zirconia films for application

in solar cells

# Bikram Prasad

a, b, M. Priyanka

b, Rupesh S. Devan

c and

* Habib M. Pathan

b

a Department of Physics, SMSG College, Sherghati, Gaya – 82211, India

b Advanced Physics Laboratory, Department of Physics, SPPU, Pune – 411007, India

c Discipline of Metallurgy Engineering and Materials Science, IIT Indore, Indore – 453 552, India

Abstract

Zirconium oxide (ZrO2) commonly known as Zirconia is a wide band material having remarkable

optical, physical and chemical properties. This includes better transparency in the visible spectrum

and near-infrared regions, high refractive index and large optical band gap thermodynamic stability,

low electrical conductivity, high melting point [1-2]. Sensitizing zirconia photoanode with cadmium

sulphide enhances the optical absorption of the solar cells in the visible region which leads to higher

photocurrents or increases external quantum efficiencies only when there is uniform coverage of these

particles on the Photoanode surface [3]. Zirconia films were spread on Fluorine doped Tin Oxide

substrate by the doctor Blade method and is annealed at 450OC in presence of air to have compact

film free from any organic compounds [4]. Sensitized films are characterized by X-ray powder

diffraction, Scanning Electron Microscope, Energy-dispersive X-ray spectroscopy and Ultraviolet–

visible spectroscopy for the specific studies.

Keywords: Zirconia, cadmium sulphide, doctor Blade



REFERENCES:

1. M A Waghmare, K S Pawar, H M Pathan, A U Ubale, “Influence of annealing temperature on the

structural and optical properties of nanocrystalline zirconium oxide” Materials Science in

Semiconductor Processing, 72, 122-127, (2017)

2. V N Cancea, R Birjega, V Ion, M Filipescu and M Dinescu; “Analysis of zirconia thin films grown by

pulsed laser deposition”, Physics AUC, 22, 50-62, (2012)

3. T Shu, Z Zhou, H Wang, G Liu, P Xiang, Y Rong, Y Zhao, H Han, “Efficient CdPbS Quantum Dots-

Sensitized TiO2 Photoelectrodes for Solar Cell Applications”, Journal of Nanoscience and

Nanotechnology, 11, 9645-9649, (2011)

4. Vikram P Bhalekar, Prashant K. Baviskar, Bikram Prasad, Niyamat I. Beedri, Vishal S. Kadam, Habib

M Pathan “Lead sulphide sensitized ZrO2 photoanode for solar cell application with MoO3 as a

counter electrode”, Chemical Physics Letters, 689, 15–18, (2017).

https://www.sciencedirect.com/science/article/pii/S1369800117314440#!





Studies on synthesis of spray deposited iron tungstate (FeWO4) thin films

and their characterization for memristive properties

N.A. Chavan1, A. R. Patil

1, K. Y. Rajpure

1*

a Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur, M.S.,

416004, India.

Abstract The FeWO4 thin films have been deposited by chemical spray pyrolysis technique. The precursor

solution was prepared by dissolving ferric nitrate and peroxotungstic acid (PTA) solutions in aqueous

medium. The deposition was taken at different deposition temperatures at the interval of 25℃ in the

range of 350℃ to 425℃. The purity and crystallinity of prepared films were improved after annealed

in nitrogen environment. The prepared films exhibit monoclinic crystal structure. The memristive

properties of the FeWO4 films were studied and results are discussed.

Keywords: FeWO4; thin films; memristive properties




Exploring the potential of the slot-die technique for single step preparation

of Perovskite-Fullerene BHJ thin film: theoretical simulation of the

Surfactant Free Microemulsion Scheme

Devashri Pravin Upasani, Prof. J. V. Sali*

OPVL, Department of Physics, School of Physical sciences, KBC NMU, Jalgaon.425001

Abstract Recently, organic-inorganic halide Perovskites (OIHPs) solar cells have been widely studied by the

researchers [1]. Perovskite material have advantages such as, tunable bandgap, high excitone diffusion

length, good electron and hole mobility and low B.E. and hence gives high power conversion

efficiency [2]. But due to unstability, encapsulation is essential. Most of the research groups have

studied for Bilayer (BiL) organic-inorganic halide Perovskites (OIHPs) solar cells and there are very

few reports on Bulk heterojunction (BHJ). BHJ is a multicomponent single blend which consists of

both donor and acceptor [3]. As compared to BiL heterojunction the application of single step BHJ

improves the donor and acceptor interfacial area which allows the easy charge transport. Hence, it

improves power conversion efficiency of the solar cell device. Additionally, BHJ with the pure phase

separation leads to more prominent photovoltaic performance. This new approach to prepare BHJ

with pure phase separation and sharp donor/acceptor interface may find applications in optoelectronic

devices such as thin film transistors, photo detectors, light emitting diodes and solar cells etc. [4]. In

single step synthesis of BHJ Perovskite solar cells the formation of multicomponent single blend is a

very difficult task because the Perovskite precursor (e.g. PbI2, PbCl2 etc.) and acceptor (PCBM, ICBA

etc.) have the limitation of solubility in a single solvent. This problem can be overcome by choosing

the Surfactant free Microemulsion (SFME) technique. SFME is most preferable for the BHJ

formation due to presence of polar and nonpolar solvents in a single solution. Microemulsions are

clear, stable, isotropic mixtures of polar (water), nonpolar (oil) and one more surface active agent

(surfactant). In this study we have employed the SFME technique for single step synthesis of

Perovskite: fullerene BHJ thin films by using Slot die method. The present SFME includes

Cyclohexane (C) as a nonpolar oil phase, DMSO (D) as a polar phase and Acetone (A) as a surfactant.

Here, acetone decides the stability of the Microemulsion during film formation. During the film

formation steps, the Microemulsion must be stable upto complete solidification, to get pure phase

separation of both donor and acceptor phases. In this work, we carried out simulation of evaporation

dynamics of the constituent solvents in Microemulsion, as a function of substrate temperature for

different Microemulsion compositions. This work sheds light on the behavior of Microemulsion

during the film formation process. The stability of the Microemulsion has been judged based on the

composition of the Microemulsion at different instants of time during solidification. This simulation

presents a way to determine optimum composition of the Microemulsion for desired BHJ

morphology. The Perovskite: fullerene BHJ films prepared by using SFME strategy and slot-die

deposition method gives good quality films at the parameters obtained from simulation curve. BHJ

thin films with Microemulsion composition based on this simulation have also been prepared.


Acknowledgement: D. P. Upasani acknowledges the financial support by the Department of

Science and Technology New Delhi under INSPIRE Fellowship Scheme.

References:

1. Isabel Mesquita, Luísa Andrade, Adélio Mendes Renewable and Sustainable Energy Reviews 82 2018 DOI:

10.1016/j.rser.2017.09.011.

2. Patrick Tonui, Saheed O. Oseni, Gaurav Sharma, Qingfenq Yan, Genene Tessema Mola, Renewable and

Sustainable Energy Reviews 91 2018 1025–1044, DOI: 10.1016/j.rser.2018.04.069

3. D. M. Marathe, H. S. Tarkas, M. S. Mahajan, G. S. Lonkar, S. R. Tak, and J. V. Sali, Journal of

Semiconductors. 2016 DOI: 10.1088/1674-4926/37/9/093003

4. Mrunal S Mahajan1, Ganesh S Lonkar

1, Sanjay S Ghosh

1, Mahendra B Patil

1, Dipak S Dalal

2 and Jaydeep V

Sali1Journal of Physics D: Applied Physics, 2015 DOI: 10.1088/0022-3727/48/26/265105.


Freshening Episodes In The North Bay Of Bengal

Devyani Kamblea , Anant Parekh

b Jasti Chowdary

b and C. Gnanaseelan

b

aDepartment of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, India,

bIndian Institute of Tropical Meteorology, Pashan, Pune 411 008, India

Abstract

Daily time series of temperature and salinity measurement recorded at 8ºN ,12ºN and 15 ºN in the Bay

of Bengal (BoB) from a Research Moored Array for African-Asian-Australian Monsoon Analysis and

Prediction buoy for the period of 2007 to 2018 which is used to study the freshening episodes in the

BoB. Salinity drops more than 1 psu with in the season is considered for the identifying freshening

episode. Seasonal analysis of number of freshening episodes at 15ºN reveals that during the winter

(DJF) maximum freshening episodes occurring. In many cases freshening is not confined to surface,

its vertical extend is reported up to 40m. Further SMAP satellite data are used to confirm the observed

episode of freshening. Analysis precipitation data from buoy and satellite confirmed that freshening

episodes are happening in the BoB are not always due to precipitation. In addition, initial data

analysis through found that under freshening conditions temperature response is non-uniform.

Figure: a)Bar chart representing number of freshening events in each season at different

buoy location i.e. 8ºN ,12ºN and 15 ºN. b) Salinity, Temperature and Density profile upto 40

m for a freshening event in JAN 2016

Keywords: SSS - sea surface salinity, SST- sea surface temperature


Acknowledgement: We would like to thank you the Director, IITM, for his encouragement during

the study. Observational data used in this study were gathered as part of the collaboration between the

Ministry of Earth Sciences (MoES) and the IITM under the guidance of Dr. Anant Parekh .The

authors also acknowledge to Department of Atmospheric and Space Sciences for providing this

platform.


References:

1. Impact of freshwater plumes on intraseasonal upper ocean variability in the BoBT Channing J. Prend a,

, Hyodae Seo b , Robert A. Weller b , John.T. Farrar b

2. The upper BoBsalinity structure in a high-resolution model Rachid Benshila , Fabien Durand ,

Sébastien Masson , Romain Bourdallé-Badie ,Clement de Boyer Montégut , Fabrice Papa b , Gurvan

Madec .

3. RAMA The Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction

by m . j . mcphaden, g . meyers, k . ando, y . masumoto ,s n . murty ravichandran ,f. syamsudin

4. Freshwater export pathways from the BoBVerena Hormann a,, Luca R. Centurioni a , Arnold L.

Gordon b.

5. Differences in heat budgets of the near-surface ASand the BoB: Implications for the summer

monsoon S. S. C. Shenoi, D. Shankar, and S. R. Shetye.

6. Impact of riverine freshwater forcing on the sea surface salinity simulations in the Indian Ocean T

K.K. Sandeep a , Vimlesh Pant a, , M.S. Girishkumar b , A.D. Rao a

7. Representation of BoBUpper-Ocean Salinity in General Circulation Models By Jasti S. Chowdary, G.

Srinivas, T.S. Fousiya, Anant Parekh, Gyannaseelan, Hyodae

8. BOBMEX: The BoBMonsoon Experiment G. S. Bhat,S. Gadgil, P. V. Hareesh Kumar,+ S. R. Kalsi, P.

Madhusoodanan,+ V. S. N. Murty, C. V. K.Prasada Rao,V. Ramesh Babu, L. V. G. Rao, R. R. Rao, M.

Ravichandran,& K. G. Reddy, P. Sanjeeva Rao, D. Sengupta, D. R. Sikka, J. Swain, and P. N.

Vinayachandran


Effect of impurities on Vortex dynamics in two-component BEC

Dibyendu Kuiri, T.Mithun, Bishwajyoti Dey

Department of Physics, Savitribai Phule Pune University

Pune 411007, India

Department of Mathematics and Statistics, University of Massachusetts,

Amherst, MA 01003-4515, USA

[email protected]

Abstract

We investigate the structure of vortex states in rotating two component Bose-Einstein condensate with

equal intracomponent but varying intercomponent-coupling constants with single impurity having

equal impurity strength for both the components. As the ratio of intercomponent to intracomponent

couplings increases, the interlocked vortex lattices undergo phase transitions from triangular to

square, double-core lattices, and eventually develope "serpentine" vortex sheets. In the transition

region of triangular to square lattice there is a continuous change i.e overlap region is changed with

the effect of single impurity. In the presence of random-impurity vortex lattice follow a two-step

melting via loss of positional and orientational order and comp-1 changes differently than comp-2 i.e

comp-2 changes more rapidly than comp-1.

References:

1. K. Kasamatsu, M. Tsubota, and M. Ueda, Phys. Rev. Lett. 91, 150406(2003).

2. T. Mithun, S. C. Ganguli, P. Raychaudhuri, and B. Dey, EPL (Europhysics Letters) 123,

20004 (2018)

3. G. Semeghini, M. Landini, P. Castilho, S. Roy, G. Spag nolli, A. Trenkwalder, M. Fattori, M.

Inguscio, and G. Modugno, Nature Physics 11, 554 (2015)

4. M. Greiner, O. Mandel, T. Esslinger, T. W. Hnsch, and I. Bloch, Nature 415, 39 (2002)

5. M. Knenberg, T. Moser, R. Seiringer, and J. Yngvason, New Journal of Physics 17, 013022

(2015)


Amendment of bulk heterojunction morphology by ultrasonic spray

coating

Gauri Govardhan Bisen, Dr. S. S. Ghosh, Prof. J. V. Sali*


Abstract Continuously extinguishing fossil fuels and rising energy demand has drawn researcher’s interest in

organic solar cells. Energy intensive thermal annealing is generally used as a post deposition

processing technique to improve the bulk heterojunction morphology. In this work we show that

adding a novel high boiling point solvent additive during spray coating of bulk heterojunction can be

used in order to improve its morphology. Atomic force microscopy and scanning electron microscopy

results show that improved bulk heterojunction morphologies can be obtained by using this new

method. This method can also be used as an alternative to thermal annealing process.


Acknowledgement: G.G. Bisen acknowledges the financial support by the Department of

Science and Technology New Delhi under Women Scientist Scheme.


Comparison of Different Qualities of Honey of Different Companies

Gayatri Dipak Mane, Dr.Ekata H.Ghate

Department of Physics, Fergusson college (Autonomous) Pune ,411004

Abstract Honey is a healthy and nutritious diet which have been also used as traditional medicine since ancient

times. But now-a-days various adulteration techniques have been on the rise. At the same time people

being more aware and health conscious, are curious about authenticity of honey. An investigation was

carried out to check various properties of honey such as pH, refractive index and optical activity.

Total six samples including four organic honey and two commercial honey were tested. Using above

mentioned techniques, many important properties which include acidity, moisture content, colour and

optical activity were studied. Recent study shows that, pureness of honey can be predicted by

analysing it’s refractive index and optical activity. Also it is a well known fact that FTIR, UV-Visible

Spectroscopy can be used to identify adulteration in food materials. The results of our study indicates

that the proposed methods are useful as screening tools to test for adulteration of honey. It is a known

fact that pure honey is made up of fructose, glucose and sucrose. However many commercially

available honey might contain added colour or preservatives or any other chemical(s) which makes it

harmful to consume that honey. Our aim is to identify pure honey samples using FTIR, refractive

index, UV -Visible spectroscopy, pH and optical activity .Our findings indicate that organic honey is

comparatively more pure than commercially available honey.

Fig.1. Tulsi Honey Fig.2. FTIR of Tulsi Honey

Keywords: Honey, Adulteration, FTIR, UV-Visible Spectroscopy, pH, Refractive index

#: Presenting author: Gayatri Dipak Mane

Acknowledgement: Dr. Poonam Deshpande, Department of Biochemistry, Dr.Raka

Dabhade, HOD Physics (Fergusson College, Pune), Cosist Lab Physics Department SPPU.

References:

1. Lidija Svecnjak, Dragan Bubalo, Nikola Biliskov and Domagoj Barisic, Agriculturae Conspectus

Scientificus , Volume 76 No.3,Page number 194, (Year 2011)

2. Colin N. Banwell and Elaine M. McCASH, Fundamentals of Molecular Spectroscopy, Page number

86, (Fourth Edition)


Visible Light Photocatalysis Towards Synthesis of Bioactive Benzazoles

Pranay Sakhare#a, Sagar Yewale#

a, Saksham Nale#

a, Rajeev Chikate

*a Hari Pawar

a*

aDepartment of Chemistry, MES’S Abasaheb Garware College, Karve road, Pune,411004.

Abstract

The [Ru(bipy)3]2+

/MMT nanocomposites as photocatalyst is synthesized by wet impregnation

approach and characterized by UV, PL, XRD and HRTEM analyses exhibiting beneficial

photocatalytic activity upto five cycles with excellent photo stability and sustainability. A highly

efficient visible light prompted photocatalytic synthesis of 2-substituted benzoxazoles,

benzimidazoles and benzothiazoles has been developed through condensation followed by visible

light assisted radical cyclization strategy. This reaction takes place in the absence of a base or oxidant

under mild conditions using [Ru(bipy)3] 2+

/MMT as a photocatalyst and represents an interesting

complement to known methods for 2-substituted benzoxazoles synthesis. This method is valuable to

the synthetic community because: a) visible light is driving force b) use of reusable heterogeneous

photocatalyst c) excellent yields and broad substrate scope with a high tolerance for variety of

functional groups.. This strategy founds to be effective under solar light with better yields of product

on gram scale. The results reported in present work provide an atom economical, convenient and

environmentally benign method for the construction of bioactive heterocycles such as benzazoles in

greener manner.

Keywords: photocataysis, MMT.



Acknowledgement: Authors are thankful to BCUD SPPU and Principal Abasaheb Garware

College, Karve road, Pune for providing funding and infrastructural support.

References:

1. F. R. Hartly, Chemistry of the Platinum Group Metals, Elsevier Science, Volume 11,1st edition, 1-

642,.1991,

2. H. R. Pawar, A. P. Jakhade and R. C. Chikate, ChemistrySelect , 2, 6949-6956, 2017.

3. A. R. Wade, H. R. Pawar, M. V. Biware and R. C. Chikate, Green Chem., 17, 3879-3888, 2015

CRCCCCC

CB

VB

[Ru(bpy)3]/MMT

h+

X = NH, O, S


Effect of crystal structure modification on the electrochemical charge

storage of WO3 nanoplates

Harishchand Nishada, Shobhnath Gupta

a, Pravin Walke

a*

aNational Centre for Nanoscience and Nanotechnology, University of Mumbai, Mumbai-400098

Abstract

The development of electrode materials is highly demanded to increase the energy density and power

density as well as cyclic life. There are variety of metal oxide nanomaterials explored for

supercapacitor due to their pseudocapacitive charge storage. Herein we report the synthesis of WO3

nanoplate by simple, template-free, low-temperature and cost-effective wet chemical method. Further

the characterization of materials is performed with XRD, FT-IR, SEM and UV-Visible spectroscopy.

XRD analysis provides the information about changing crystal structure with respect to synthesis

conditions. We observed that the synthesis parameters are very crucial which is directly influencing

the structure formation as well as tune the band gap. The FESEM reveals the formation of two

dimensional nanoplates. Further the electrochemical investigation of WO3 nanoplates exhibits the

specific capacitance of 227.27 Fg-1

with high energy density of 9.55 Wh kg-1

. It has excellent stability

90.20 % even after 3000th cycle. Thus, the WO3 materials has great potential to use in portable

devices.

Keywords: Nanoplates; pseudocapacitor; specific capacitance; crystal structure.




Theoretical Study of Structural, Magnetic and Electrical properties of

Undoped and Doped Cadmium Telluride Nanotube

Harshada A. Barvea,#

, Dr. D.L.Lalsarea

a Department of Physics, H.P.T. Arts & R.Y.K. Science college, Nashik, 422005

Abstract Cadmium Telluride (CdTe) has numerous applications in a radiation detector if used with zinc, in

infrared detection, can be used as an electro-optic modulator in variety of applications for various

lasers(He-Ne, CO, CO2 lasers), in photovoltaics, in photocatalytic activities, in Dilute Magnetic

Semiconductor (DMS), in spintronics. Density Functional Theory (DFT) allows all the properties to

be determined by electron probability density. The relaxation calculations are performed using the

projector augmented wave (PAW) approach as implemented in VASP code which performing Ab-

initio calculation. In present work we choose CdTe (Cd and Te are cation and anion respectively) as a

building block for nanotube. The structural, magnetic and electrical properties of CdTe nanotube are

determined by varying the length of nanotube. Further the same is doped with transition metals

(CdmYxTen), where Y= Mn, Cr, Co which represents doped transition metal. We check the preferable

kind of doping (exohedral, substitutional or endohedral) and its properties are analyzed by changing

the percentage of doping, position of the dopant for different transition metals as a dopant. The study

of structural properties include binding energy (Eb), nature of bonding from total charge density and

partial charge density plots. Electronic properties include energy gap between highest occupied

molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) (Eg), vertical

detachment energy (VDE), ionization potential (I.P.), electronic stability. Magnetic properties include

magnetic moments, spin gap, density of states (DOS) plots.

Keywords: CdTe; DFT; nanotube


References:

1. Structural and Electronic properties of CdTe, Chapter 3;

2. Structural Stability and Electronic Properties of CdS Condensed Clusters, S. Karthikeyan, E. Deepika,

and P. Murugan.

3. Max C. Holthausen, Wolfram Koch; A Chemist's Guide to Density Functional Theory


Current Dynamics In Single Particle Quantum Walk On A One

Dimensional Lattice.

Hemlata Bhandari, P.Durganandini


Abstract In recent years, quantum walks have become a very active area of research [1]. Quantum mechanical

notions of coherence, superposition and interference play an important role in the dynamics of

quantum particles, giving rise to a very different behavior of quantum walks (QW) such as ballistic

propagation instead of the typical diffusive nature of classical random walk [2]. They allow to probe

various fundamental concepts in quantum mechanics like that of wave particle duality, coherence and

decoherence, entanglement, measurement process, etc. In this work, we investigate the dynamics of

single particle quantum walk on 1D lattice allowing nearest and next nearest neighbor hopping

(NNN)[3,4]. We show the features like emergence of additional internal fronts with increasing

strength of the next nearest neighbor hopping in the probability current density profiles. We also

investigate the dynamical scaling structure of the cumulative probability current density function

which has both global as well as local scaling property which leads to a local staircase structure near

the fronts.

References:

1. J. Kempe, Contemp. Phys. 44, 307 (2003).

2. Y. Aharonov, L.Davidovich and N.Zagury, Phys. Rev. A 48, 1687 (1993).

3. B.Hemlata and P.Durganadini, Phys. Rev. A 99, 032313 (2019).

4. P. L. Krapivsky, J. M. Luck and K. Mallick, J. Phys. A Math. Theor. 48, 475301 (2015).


Heterogeneous Thin film FTO/TiO2/Al2O3/N2-doped TiO2 as an application

for Photo-Electro-Chemical (PEC) Cells and solar absorbers.

Indrajit Shriwastav, Avishkar Derle, and Dr. Ashish Yengantiwar

Department of Physics, Fergusson College (Autonomous), Pune -411004

Abstract Photo electrochemical (PEC) cells offer a promising method of hydrogen production driven directly

by solar energy; however materials limitations have significantly hindered their efficiency. The

objective of our research is to improve the efficiencies of PEC cells by identifying and engineering

corrosion-resistant semiconductors that exhibit the optimal conduction and valence band edge

alignment for PEC applications.For this purpose we have used hydrothermal method for synthesis of

TiO2 and Nitrogen doped TiO2 nanoparticles and commercial Al2O3 powder was used. For film

preparation spin coating technique was used and FTO was used as a substrate. In this way we have

finally developed Heterogeneous Thin film [FTO/TiO2/Al2O3/N2-doped TiO2] as an application for

Photo-Electro-Chemical (PEC) Cells and solar absorbers. For characterization we have used different

techniques such as XRD, UV-Visible Spectroscopy and Hall measurement, etc. Our conclusion

indicates that the given heterogeneous thin film is best for absorbing maximum solar energy and is

best for PEC cells.

Figure: schematic representation of sample

Keywords: Photo electrochemical cells, photo absorbers, hydrothermal method; Spin

coating, XRD, UV-Visible, etc.

#: Presenting author: Indrajit Ratan Shriwastav.

*: Corresponding author: Dr. Ashish Yengantiwar, Indrajit Shriwastav and Avishkar

Derle.

Acknowledgement:

1. Dr. Raka Dabhade, HoD Physics Department, Fergusson College.

2. Consist Lab Physics Department SPPU.

References:

1. Antonio Rubino*, Pier G. Schiavi, Pietro Altimari, Alessandro Latini, Francesca Pagnanelli; chemical

engineering transactions, vol.73 (2019)

2. Siriphan Chainaronga,d, Lek Sikonga,d, Sorapong Pavasupreec, and Sutham Niyomwasb,d; 9th Eco-

Energy and Materials Science and Engineering Symposium Energy Procedia 9 ( 2011 ) 418 – 427

(2011) 3. J. Senthilnathan, Ligy Philip; Chemical Engineering Journal 161, 83-92.(2010)

N2-doped TiO2

nanoparticles

Al2O3

FTO

TiO2


Glucose Detection Using SILAR Grown Nickel Nanoparticles

Jyoti Jadhava, Akshay N. Vyas and S. D. Sartale

a,*

aThin Films and Nanomaterials Laboratory, Department of Physics, Savitribai Phule Pune University,

Pune – 411 007

Abstract

With changing times and hectic schedules it is becoming more and more difficult for people to have a

healthy life style, there-by giving rise to an increased number of diabetic patients. With rising demand

for packaged food, even food industry is experiencing a major boom. For both the above sectors

(Health and Food) detection of glucose is a major process. Hence, detection of glucose using a

reliable, quick and simple as well as accurate method is quickly becoming a topic of increased interest

globally. Monitoring the electrochemical activity of glucose containing fluids is one such method.

This method requires an electrocatalytically active catalyst. Here, we present the production of

electrocatalytically active Ni nanoparticles as catalysts for glucose detection. Ni nanoparticles have

been grown on stainless steel substrate by using low cost successive ionic layer adsorption and

reaction (SILAR) method. NiCl2 is used as Ni ion source, double distilled water (DDW) is used for

rinsing and NaBH4 is used as reducing agent. The effect of NiCl2 concentration on glucose detection

is studied. The grown Ni nanoparticles are confirmed using X-ray diffraction (XRD) and X-ray

photoelectron spectroscopy (XPS). The electrochemical property of grown Ni nanoparticles is studied

by performing cyclic voltammetry in 0.5 M NaOH. For glucose detection an aqueous solution

consisting of 0.5 M NaOH and 0.5 M glucose was used primarily. The CVs clearly shows that an

increase in NiCl2 concentration leads to significant increase in the current density values for glucose

detection. Our research highlights and promotes the use of cost-effective and simpler SILAR method

for the production of highly active glucose sensor.

Keywords: Glucose detection, Successive ionic layer adsorption and reaction, Nickel

nanoparticles, electrocatalytic activity.

#Presenting Author: [email protected]

*Corresponding Author:[email protected]


Synthesis, Characterization and Application of ZnO by Mechanochemical

Method

S. D. Ahera#

, S. L. Kadama*, R. B. Kharade

a and P. R. Abhale

a

a Department of Physics,

New Arts, Commerce and Science College, Parner, Dist- Ahmednagar- 414302.

Abstract Zinc Oxide nanoparticles (ZnO) were successfully synthesized by Mechano-chemical method [1].

Synthesized ZnO nanoparticles were characterized by X-ray diffraction (XRD), scanning electron

microscopy (SEM), UV-visible spectroscopy and Energy dispersive X-ray spectroscopy (EDX). XRD

data is in agreement with Satyanarayana et. al. [2]. The morphology, size and structure of these ZnO

nanoparticles were investigated using SEM. The optical properties of the samples were investigated

by measuring the UV-VIS absorption at room temperature. The percentage of Zinc and Oxygen are

determined by EDX. SEM images are in agreement with the XRD data which shows average size of

the nanoparticles about 25nm.

Figure: SEM of ZnO Nanoparticles

Keywords: zinc oxide, mechano-chemical method, nano powder, characterization.



Acknowledgement:

We would like to thank Principal Dr. R. K. Aher of our college for permitting us to use all

facilities available in the college during this work.

References:

1. Ameer Azam, Faheem Ahmed, Nishat Arshi, M. Chaman and A.H. Naqvi, International

Journal of Theoretical & Applied Sciences. (2009).

2. Satyanarayana Talam, Srinivasa Rao Karumuri and Nagarjuna Gunnam; International

Scholarly Research Network ISRN Nanotechnology, Article ID 372505(2012).


Synthesis of 2 - Substituted Benzimidazoles Catalyzed by ZnO

Nanoparticles

Goraksh J. Hase*, Kiran T. Bharati

#, Kajal G. Hase

Department of Chemistry, S. N. Arts, D. J. M. Commerce and B. N. S. Science College, Sangamner -

422605 (MS) India.

Abstract Green synthesis of ZnO nanoparticles has been prepared by solid state method. ZnO nanoparticles are

characterized by XRD, FESEM, EDX and HR-TEM. The SPR of ZnO nanoparticles is 378 nm and

band gap 3.6 eV. The ZnO nanoparticles average crystalline size has obtained 6.36 nm. FESEM

image shown that ZnO nanostructure is hexagonal. The prepared nanoparticles are used as a catalyst

in organic synthesis of 2- substituted benzimidazoles compounds such as chloro, nitro and hydroxyl

derivatives. Catalyst is recovered by inexpensive methods. The synthesized compounds have

interpreted by Thin Layer Chromatography, Physical Constant, UV-Visible, FT - IR and 1H - NMR

spectroscopy. Green synthesis of nanoparticles is gaining importance due to its cost-effectiveness,

reduction of toxic chemicals.

Fig.1: XRD of ZnO Nanoparticles Fig. 2: EDX of ZnO Nanoparticles

Fig.3: FTIR of ZnO Nanoparticles Fig.4: FE-SEM image of ZnO Nanoparticles

Keywords: ZnO nanoparticles, UV-Visible, FT-IR, 1H-NMR.



Position [°2θ] (Copper (Cu))

20 30 40 50 60 70 80

Counts

0

5000

10000 ZN-1



Acknowledgement: Authors are greatful to Prin. Dr. K. K. Deshmukh of Sangamner college for

providing laboratory facilities and also thankful to DST- FIST, SAIF Punjab National University and

CIL, Pune University for providing instrumental facility.

References:

1. Joghee Suresh, Ganeshan Pradheesh, Vincent Alexramani, Mahalingam Sundrarajan4 and

Sun Ig Hong1, Green synthesis and characterization of zinc oxide nanoparticle using insulin plant

(Costus pictus D. Don) and investigation of its antimicrobial as well as anticancer activities, Adv. Nat.

Sci.: Nanosci. Nanotechnol. 9, 1-8, (2018).

2. Javad Safaei - Ghomi, Mohammad Ali Ghasemzadeh, Zinc oxide nanoparticles: A highly efficient and

readily recyclable catalyst for the synthesis of xanthenes, Chinese Chemical Letters

Volume 23, Issue 11, Pages 1225-1229 (2012).

3. Santosh Bahadur Singh*, Praveen Kumar Tandon, Catalysis: A Brief Review on Nano - Catalyst,

Journal of Energy and Chemical Engineering, Vol. 2 Iss. 3, PP. 106-115 (2014).

4. V. Polshettiwar and R. S. Varma, “Green chemistry by nano-catalysis,” Green Chem., vol. 12, pp. 743–

754, 2010.

5. H. Cong, C. F. Becker, S. J. Elliott, M. W. Grinstaff and J. A. Porco, Jr., “Silver nanoparticle-catalyzed

Diels-Alder cycloadditions of 2-hydroxychalcones,” J. Am. Chem. Soc., vol. 132, pp. 7514–7518,

2010.

6. S. B. Kalidindi and B. R. Jagirdar, “Nanocatalysis and prospects of green chemistry,” ChemSusChem,

vol. 5, iss. 1, pp. 65–75, 2012.

7. Kuldeep Singh, Synthesis of benzimidazole derivatives and study of their antimicrobial and antifungal

activities, Oriental Journal of Chemistry 23(2):641 (2007).



https://www.sciencedirect.com/science/journal/10018417

https://www.sciencedirect.com/science/journal/10018417/23/11

https://www.researchgate.net/profile/Kuldeep_Singh52?_sg%5B0%5D=mYm27lr2DL3p_bHXz3sDKFbz_Zdk2DwBlA5tEx54gTzeVkPD4d-Xh3Fxu6day3mvXmsBn2Y.RfeznH89LLZ0GEbSjPs3bkJX1t428lnfVtosrPxtegMr0jC6gGrJRAMo1yOBGUSm92KwQ62ytsqQl4HfkhAatg&_sg%5B1%5D=qB35xtCC1HQuuzFmGKOG8kQjFvmwFEkh268r51FyoNfPBMgKjj3PcF9fB3AU0MS0z7lhPtM.TJyyeHrGsMU62H221N-C0Bh6MXHo-Mot3arnMdc_an0cuTO_OqFn-YlA8OEZq-N2elps17R2qpaLEpR6WIVV7g


Dielectric and magnetic properties of CoFe2O4-BaFe12O19 nanocomposites

Kalyani Dhabekar# and K. Mohan Kant

*

Visvesvaraya National Institute of Technology, Nagpur, 440010

Abstract Nanocomposites of magnetic materials are of great interest due to the prediction in enhancement of

magnetic energy product as well as exhibiting wide band gap microwave absorption for reducing

electromagnetic interference [1, 2]. In present work, synthesis of hard phased barium ferrite

(BaFe12O19) and soft phased cobalt ferrite (CoFe2O4) nanoparticles were carried out by chemical co-

precipitation route [3, 4]. The soft and hard phase were mixed into weight ratio of 1:1, 1:2, 1:4, 1:8

and 1:16 (cobalt ferrite: barium ferrite) and were investigated for electrical properties and exchange

interaction. The obtained mixtures were represented as S/H-1/1, S/H-1/2, S/H-1/4, S/H-1/8 and S/H-

1/16. The average crystallite size of CoFe2O4 and BaFe12O19 as evaluated from X-ray diffraction

patterns was found to be 17 nm and 60 nm respectively. Exchange coupling in the nanocomposites

was confirmed from room temperature M-H curves and further confirmation was provided by First

order reversal curve (FORC) measurements and dM/dH vs. H curves for the prepared composites. The

dielectric response for all nanocomposites was well described by Koop’s model. The detailed

dielectric response will be discussed in full manuscript.

Figure: First order reversal curves starting from positive saturation field of 15 kOe for (a)

S/H-1/1, (b) S/H-1/2, (c) S/H-1/4, (d) S/H-1/8 and (e) S/H-1/16.

Keywords: nanocomposites, co-precipitation, exchange coupling, FORC, dielectric



References:

1. E. F. Kneller and R. Hawig, IEEE Trans. Magn., 27, 3588-3599, (1991)

2. D. Lisjak, V. B. Bregar, A. Znidarsic and M. Drofenik, J. Optoelectr. Adv. Mater., 8, 60-65, (2006)

3. K. V. Chandekar and K. M. Kant, Physica B, 520, 152-163, (2017)

4. Z. Mosleh, P. Kameli, M. Ranjbar and H. Salamati, Ceramics International, 40, 7279-7284, (2014)


Phase transition study of BiVO4 Photocatalyst

Kanchan Berad1, Siddiqui Shafreen

1, S. I. Patil

2, Shankar S. Kekade

1*

1Department of Physics, Radhabai Kale Mahila Mahavidyalaya, Ahmednagar, 414001, India

2Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India

*Corresponding author: Shankar S. Kekade, E-mail: [email protected]

Abstract

The bismuth vanadate is promising visible light driven semiconductor photocatalyst with various

benefits such as low production cost, low toxicity, high photostability, resistance to photocorrosion

and narrow band gap with a good response to visible light excite. The BiVO4 photocatalyst were

synthesized by using solid state reaction route for study the structural phase transition. The samples

were sintered at different temperature ranging from 2000C to 600

0C. The structural phase transition

observed from scheelite tetragonal to scheelite monoclinic. Grain size was observed to increases with

increase in sintering temperature. The characterization of BiVO4 samples was also carried out by UV-

Vis spectroscopy, scanning electron microscopy (SEM). The photocatalytic activities of BiVO4

samples were confirm by the methylene Blue degradation under the visible light irradiation. The

monoclinic BiVO4 shows the excellent photocatalytic activity than that of tetragonal BiVO4.

Keywords: Bismuth Vanadate, Photocatalyst, Photodegradation, Solid state reaction

route.

Figure 1: XRD pattern of BiVO4 sintered at 2000C, 300

0C, 400

0C, 500

0C, 600

0C,

Δ- tetragonal BiVO4, * - Bi2O3

References:

1. A. Fujishima and K. Honda, Nature, 238, 37 (1972)

2. A.Kudo, K. Omori, H. Kato,J.Am. Chem. Soc. 121, 11459, (1999)


Molecules can explain the expansion of the Universe

Karan R.Takkhi

Fergusson College, Department of Physics, Pune 411 004

Abstract The Hubble diagram continues to remain one of the most important graphical representations in the

realm of astronomy and cosmology right from its genesis that depicts the velocity-distance relation for

the receding large-scale structures within the Universe; it is the diagram that helps us to understand

the Universe’s expansion. In this paper I introduce the molecular expansion model in order to explain

the expansion of the Universe. The molecular expansion model considers the large-scale structures as

gas molecules undergoing free expansion into the vacuum. Large-scale structures being ensemble of

atoms must behave like molecules possessing finite amount of energy. Since metric expansion of

space cannot be tested practically and can only be observed indirectly due to the presence of

observable entities, therefore, instead of considering the metaphysics of expanding space, the paper

emphasizes upon the actual recession of large-scale structures as the most natural reason to explain

the observed expansion. I show in this paper that the linear velocity-distance relation or the Hubble

diagram is actually a natural and a characteristic feature of different gas molecules undergoing free

expansion into the vacuum at the same time. Different gas molecules naturally have different

velocities, and, molecules being natural entities provide a natural and a scientifically-viable

explanation better than metaphysics. The study conducted in this paper finds the recessional

behaviour of large-scale structures to be consistent with the recessional behaviour of molecules. The

free expansion of different gas molecules into the vacuum of the Universe is found to be

homogeneous, isotropic and in agreement with the Copernican principle. Redshift-distance

relationship has been plotted for 580 type Ia supernovae from the Supernova Cosmology Project, 7

additional high redshift type Ia supernovae discovered through the Advanced Camera for Surveys on

the Hubble Space Telescope from the Great Observatories Origins Deep Survey Treasury program,

and 1 additional very high redshift type Ia supernova discovered with Wide Field and Planetary

Camera 2 on the Hubble Space Telescope. Redshift-distance relationship for these 588 type Ia

supernovae has been analysed and the reason for the deviation of the Hubble diagram from linearity at

high redshifts has been explained without acceleration by introducing the concept of differential

molecular expansion.

Keywords: cosmology: theory – dark energy – Hubble’s law – molecular data – molecular expansion.

Presenting author: Karan R.Takkhi; [email protected] (Mob. 9921355422)

Acknowledgements: I am grateful to National Academy of Sciences, U.S.A. for allowing me to illustrate

the Hubble diagram for type Ia supernovae (compilation of type Ia supernovae by Jha 2002; illustrated from

Kirshner (2004)). I am grateful to the Supernova Cosmology Project team for the data pertaining to 580 type Ia

supernovae (Union 2 (Amanullah et al. 2010) and Union 2.1 (Suzuki et al. 2012)). I am grateful to the GOODS

(Great Observatories Origins Deep Survey) Treasury program team (joint work conducted by Giavalisco et al.

2004 and Riess et al. 2004) for the high redshift type Ia supernovae discovered by them through the ACS

(Advanced Camera for Surveys) on the Hubble Space Telescope (7 of these high redshift type Ia supernovae

have been plotted). I am also grateful to Gilliland et al. (1999) for the very high redshift type Ia supernova

discovered by them with WFPC2 (Wide Field and Planetary Camera 2) on the Hubble Space Telescope (1 high

redshift type Ia supernova has been plotted).

(Times New Roman, 12 pt, Left, Section Heading,


References:

1. Amanullah R., et al., 2010, ApJ, 716, 712

2. Bunn E. F., Hogg D. W., 2009, AmJPh, 77, 688

3. Chodorowski M., 2007, MNRAS, 378, 239

4. Davis T. M., Lineweaver C. H., 2004, PASA, 21, 97

5. Durrer R., 2011, RSPTA, 369, 5102

6. Einstein A., 1917, Sitz. Preuss. Akad. Wiss. Phys.- Math, 142, 87

7. Francis M. J., Barnes L. A., James J. B., Lewis G. F., 2007, PASA, 24, 95

8. Frieman J. A., Turner M. S., Huterer D., 2008, ARA&A, 46, 385

9. Giavalisco M., et al., 2004, ApJ, 600, L93

10. Gilliland R. L., Nugent P. E., Phillips M. M., 1999, ApJ, 521, 30

11. Hubble E. P., 1929, Proc. Natl. Acad. Sci., 15, 168

12. Jha S., 2002, Ph.D. thesis (Harvard Univ., Cambridge, MA)

13. Kirshner R. P., 2004, Proc. Natl. Acad. Sci., 101, 8

14. Milne E. A., 1934, Q. J. Math., 5, 64

15. “Norma Cluster”. NASA/IPAC Extragalactic Database (NED)., 2006

16. Perlmutter S., Aldering G., Goldhaber G., Knop R. A., Nugent P., et al., 1999, ApJ, 517, 565

17. Riess A. G., Filippenko A. V., Challis P., Clocchiatti A., Diercks A., et al., 1998, AJ, 116, 1009

18. Riess A. G., et al., 2004, ApJ, 607, 665

19. Riess A. G., 2012, Rev. Mod. Phys., 84, 1165

20. Rindler W., 1977, Essential Relativity, revised 2nd

edn. Springer-Verlag, New York, Heidelberg, Berlin

21. Sabulsky D. O., Dutta I., Hinds E. A., Elder B., Burrage C., Copeland E. J., 2019, Phys. Rev. Lett. 123, 061102

22. Schmidt B. P., 2011, Nobel Prize Lecture in Physics

23. Suzuki N., et al., 2012, ApJ, 746, 85

https://ui.adsabs.harvard.edu/#abs/2007PASA...24...95F/abstract


SILAR synthesised of MnO2 nanoflowers and their supercapacitive

performance

Kaustubh Sawant, Mangesh A. Desai, Shrikrishna D. Sartale


Savitribai Phule Pune University, Pune- 411 007, India

Email: [email protected]

Abstract

MnO2 is one of the potential material for supercapacitor application therefore to reach higher

specific capacitance values several strategies have been utilized during its synthesis which brings out

variation in crystal phases, increment in surface area and tuning of morphologies, etc. Herein, we have

demonstrated facile synthesis of MnO2 thin films by using successive ionic layer adsorption and

reaction (SILAR). In the experiment, strong oxidizing agent KMnO4 reacts with weak reducing agent

manganese sulfate (MnSO4) for synthesis of MnO2 thin films. The morphological studies revealed

that MnO2 thin films composed of nanoflower-like hierarchical structure. Structural characterization

techniques confirmed MnO2 phase formation. Electrochemical studies like cyclic voltammetry (CV)

and charge-discharge (GCD) were performed on potentiostat by using three electrode system with 1

M Na2SO4 (as electrolyte). The deposited MnO2 thin film of dimension 1cm x 1cm was used as

working electrode. The calculated MnO2 specific capacitance values were 668, 640, 579, 492 and 406

F/g at 5, 10, 20, 50 and 100 mV/s respectively. The calculated MnO2 specific capacitance values were

402, 396, 337 and 315 F/g at 1 A/g, 2 A/g, 4 A/g and 8A/g resp.

Keywords: Supercapacitor, MnO2, SILAR


Eu Activated MgB4O7 Phosphor for Thermoluminescence Radiation

Dosimetry

Ketan S. Navale#, Saurabh Wable, Kishor H. Gavhane , M. S. Bhadane, V. N.

Bhoraskar, S. D. Dhole and S. S. Dahiwale*

Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune-

411007, India

Abstract Thermoluminescence is related to emission of visible light, when an insulator substance is exposed by

an ionizing radiation and subsequently excited by a thermal energy. In this paper, we synthesized

MgB4O7: Eu material via solid state diffusion route. The materials properties of MgB4O7: Eu was

studied by XRD and Thermoluminescence properties. MgB4O7: Eu was prepared and then irradiated

with Co-60 gamma source at different doses. Thermoluminescence measurements of MgB4O7: Eu

phosphors show a strong well resolved solitary peak at 175 °C and 260 °C. The TL response curve is

observed to be increasing from 1 Gy to 5 kGy. Experimental glow curve was further studied by Initial

Rise Method (IRM) and Tm-Tstop analysis to find out trapping parameters. TL peak parameters such

as the kinetic parameters of gamma-irradiated phosphors were calculated from thermoluminescence

data using Glow Curve Deconvolution (GCD) methods. Finally, MgB4O7: Eu nanophosphor was

successfully studied for structural and optical properties along with Thermoluminescence properties

for dosimetric.





Solution of the Schrödinger Equation for the Simple Harmonic Oscillator

using Finite Difference Method.

Komal B. Wakchaure 1 , Siddharth S. Karkhanis

1, N. S. Pote

2

1Department of Physics, HPT Arts & RYK Science College, Nashik - 42005

2Department of Physics, K. J. Somaiya College Kopargaon, Ahmednagar - 423601

Abstract

Computational physics is the study and implementation of numerical analysis to solve problems in

physics for which a quantitative theory already exists. Computational physics was the first application

for modern computers in science, and is now a subset of computational science. It is often regarded as

a offshoot of a theoretical physics, but it’s an intermediate branch between theoretical and

experimental physics which supplements theory and experiments. This is the beauty of computational

physics both as an overlap of physics, applied mathematics and computer science and as a bridge

among them. We have used the Varlet Method to solve the Schrödinger equation for 1D simple

harmonic oscillator which is second order ordinary differential equation. Further we have

implemented the finite difference method to compute general solution of the equations numerically.

These method fall under the general class of one step method. We have used the C++ language as a

programming platform to design the program which consists of three major functions initialize,

calculate and store. Results showed that the method is quite appreciable to obtain approximate

solution of Schrödinger equation for other quantum mechanical systems. For 1D SHO our results

shows that up to n=7, wavefunction show some tunneling in quantum forbidden region but the detail

analysis was beyond the scope of this work. Our work gives idea of behavior of wavefunction but

program so used need some modifications to calculate energy as well.


References:

1. Computational physics, Pearson education, N. J. Giordano, H. Nakanishi, 2006.

2. Mathematical method in the physical Sciences, Wiley, M. L.Boas, 2006.

3. Mathematical methods for physicists,Academic press, Arfken,Weber, & Harris, 2003.

4. Introduction to quantum mechanics, Pearson education, D. J. Griffiths, 2015.


Synthesis, growth optimization and characterization of Re-Te thin films

Komal R. Bhambe

1,2, *, A. Azizur Rahman

1, Emroj Hossain

1, Amit P. Shah

1, and Arnab

Bhattacharya1

1Dept. of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research,

Mumbai, India 2Dept. of Physics, Annasaheb Magar College, Hadapsar, Maharashtra, India


Abstract

Transition metal dichalcogenides (TMDCs) have attracted a lot of recent research interest because of

their unique structural and electronic properties. While there are a few reports on the rhenium

chalcogenides like ReS2 and ReSe2, the rhenium-tellurium based compounds have received little

attention. Further, there are conflicting reports on their composition and structure [1-3]

. Although there

are few reports on synthesis of bulk Re-Te compounds there are no reports on the growth of Re-Te

thin films to the best of our knowledge. Here we report the synthesis of Re-Te thin films by a two-

stage process and investigated the structural and optical properties of the as-grown films. First,

rhenium metal was deposited on sapphire substrates by e-beam evaporation and the metal films were

subsequently subjected to a tellurization process. The influence of various growth parameters like

thickness of Re metal, tellurization temperature and heating profile were systematically investigated

to optimize layer quality. For instance, the growth temperature has dramatic influence on surface

morphology of the thin films. Fig. 1 shows the SEM micrograph of the films grown at different

temperatures. Fully coalesced thin films are formed at 950 °C, while discontinuous nano-crystalline

structures are seen at lower temperature. From the preliminary investigation of the structural

properties it is difficult to conclusively distinguish the phases since the reported phases ReTe2,

Re2Te5, and Re1.7Te5.3 all have similar crystal structure and lattice parameters. EDX composition

measurements suggest that the Te-rich phases are more likely. Fig 2 shows the variation in the Raman

profile of films grown at different temperatures. Details of the synthesis of Re-Te thin films by the

two step method and structural and optical characterization results will be presented.

References

[1] S. Furuseth and A. Kjekshus, Acta Scand. 20 (1966) 245.

[2] C. A. Sorrell, J. Amer. Ceram. Soc. 51 (1968) 285.

[3] F. Klaiber, W. Petter, F. Hulliger, J. Solid State Chem. 46 (1983) 112

50 100 150 200 250 300 350

185

cm

-1

277 cm-1

217 cm-1

142

cm

-1

850oC

122 cm-1

103

cm

-1

156

cm

-1

248 cm-1

Inte

nsity (

a.u

.)

950oC

Raman shift (cm-1)

900oC (b

)

2

850(a)

2 µm

Fig 1. SEM images of Re-Te thin

films grown at different temperatures Fig 2. Raman spectra of samples grown at different

temperatures


Chemically Deposited Nanocrystalline Nickel Sulphide Thin Films for

Electrochemical Supercapacitor Application

M. S. Sonawanea*,

R. S. Patilb

aDepartment of Physics, R.C. Patel Institute of Technology, Shirpur, 425405.

bDepartment of Physics, P. S. G. V. P. M’S Arts, Science & Commerce College, Shahada,425409.

Abstract

Nickel Sulphide (NiS) thin films were synthesized on stainless steel (SS) substrates using a simple

chemical bath deposition route. The surface morphology and crystal structure of the film were

investigated by scanning electron microscopy and X-ray diffraction techniques, respectively. The

electrochemical supercapacitor performances were examined by using cyclic voltammetry and

galvanostatic charge-discharge method. The supercapacitive properties of NiS were strongly affected

by scan rate, concentration of electrolyte and deposited mass of the material. The maximum specific

capacitance of 441 Fg-1

was obtained in 2 M KOH electrolyte at a scan rate 10 mVs-1

within the

potential range 0 to +0.8 V Vs Ag/AgCl. Charge-discharge behaviors have been observed that the

supercapacitive parameters such as, specific energy (S.E.) and specific power (S.P.) are 10 Whkg−1

and 4.8 KWkg−1

respectively.

Figure: The CV curves of NiS electrode at 10 to 100 mVs-1

scan rates in 2 M KOH electrolyte.

Keywords: NiS, Thin films, Cyclic voltammetry, Supercapacitor, Charge-discharge

*: Corresponding & Presenting author: [email protected]

Acknowledgement:

Authors are thankful to Principal, PSGVPM’S ASC College, Shahada for his constant support

throughout this work. The authors would like to thank the Department of Physical Sciences, NMU,

Jalgaon and Nano Materials and Device Laboratory, Applied Physics Department, VNIT, Nagpur for

the provision of characterization facilities.

References:

[1] R. S. Mane, C. D. Lokhande, Mater. Chem. Phys., 65,1-31, (2000).

[2] Ting Zhu, Zhiyu Wang, Shujiang Ding, Jun Song Chen and Xiong Wen (David) Lou, RSC Adv.,

1, 397-400 (2011).

[3] Jiaqin Yang, Wei Guo, Di Li, Caiying Wei, Hongmin Fan, Liyan Wu, Wenjun Zheng, J. of Power

Sources, 268,113-120,(2014).

[4] Zusing Yang, Chia-Ying Chen, Huan-Tsung Chang, Journal of Power Sources, 196,7874-7877, (2011).

0.0 0.2 0.4 0.6 0.8-10

0

10

20

30

Voltage (V Vs Ag/AgCl )

Cu

rren

t D

en

sit

y (

mA

cm

-2)

10 mVs-1

20 mVs-1

50 mVs-1

75 mVs-1

100 mVs-1


Photo-electrochemical Properties of SILAR Synthesized ZnO Thin Films

Mahesh Godse#, Mangesh Desai and Sunita Bhagwat*

Department of Physics, Abasaheb Garware College, Karve road, Pune-411004

Abstract

ZnO thin film are promising material in multipurpose application like solar cell and

piezoelectric device manufacturing sensor applications etc. by tailoring its electrical and optical

properties. ZnO superstructures show exceptional performance for hydrogen production via photo-

electrochemical (PEC) water splitting because of their certain advantageous properties such as high

internal surface area, enhanced scattering with improved light harvesting, reduced recombination rate,

low charge transfer resistance, better crystallinity, channelled conducting pathways, etc. Different

method of preparation are adopted for ZnO thin film synthesis for its specific use. Here we selected

Successive Ionic Layer Adsorption and Reaction (SILAR) method for ZnO thin film synthesis, which

is method preferred over ordinary chemical bath method. ZnO thin film is prepared on glass substrate

and FTO by using SILAR technique, ZnO thin film are obtained by successive immersion of substrate

in aqueous solution containing: Zn(CH3COO)2 with different molarities, ammonia solution and

distilled water heated at 90ᵒC as precursor solution. The structural, morphological and optical

properties of the films have been studied by using X-RAY Diffraction(XRD), Scanning Electron

Microscopy(SEM), UV-VIS-Spectrophotometer, etc. The X-ray diffraction analysis shows that the

film are polycrystalline with zincite hexagonal structure with preferential orientation of (100), (002),

(101) plane. The study of surface morphology shows that deposited ZnO film take shapes like flower

structure. SILAR synthesized ZnO thin film deposited on FTO are studied for its Photoelectro-

chemical effect.

Figure: (a) XRD and (b) SEM of SILAR synthesized ZnO thin films for 0.025 M, 0.05 M

and 0.075M.

Keywords: SILAR, ZnO films, Photo-electrochemical effect

Presenting Author: [email protected] Corresponding Author:

[email protected]

Reference:

1. H.M.Pathan, C.D.Lokhande, Bulletin of Material Science, 27, 2-28 (2004).

2. P. Mitra and S. Mondal, Progress in Theoretical and Applied Physics, 1, 1-15 (2013).

0.025 M 0.05 M

0.075 M


Selective Dissolution of Inter-Diffused P-N Junction to Enhance Charge

Carrier Mobility

Mrudul Modaka,b#

, Bharath H Jc, Shreya Patil

a,b, Arul Kashmir A

a*

a Centre for Materials for Electronics Technology (C-MET), Panchwati, Off Pashan Road, Pune

411008, b Modern College of Arts, Science & Commerce, Shivajinagar, Pune 411005,

c CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008

Abstract Organic field effect transistors (OFET) use organic semiconductor materials for their fabrication.

Herein, we report a methodology to regenerate the unipolar charge transport from inter-diffused p-n

junctions utilizing the orthogonal solvent approach. This approach involves the selective dissolution

of acceptor materials from inter diffused p-n junctions leading to the regeneration of donor layer

properties. By using Electrochemical impedance analysis (EIS) and charge carrier mobility

measurements, we corroborate that the p-n junctions with ambipolar charge transport indeed convert

into unipolar in nature. The hole carrier mobility observed was 1.6x10-3

cm2/Vs, ~50% increased than

that of pristine P3HT (Poly(3-hexylthiophene)), 9.2x10-4

cm2/Vs. PCBM (Phenyl-C61-Butyric-Acid-

Methyl-Ester) dissoluted device also showed a high on/off ratio of 5.6x103 for low threshold voltage

(2V). These device matrices are correlated with the improved contacts made with the FET channels

during the dissolution event. Further about 60% reduction in the contact (RC) and channel resistance

(RCH) for the acceptor dissoluted devices was observed. Similarly, ~30% increase in carrier mobility

was observed for another donor material PTB7 (Poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-

b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]]) polymer.

The regenerated unipolar material is found to be suitable for fabricating high performing photodiodes,

solar cells and OFET and for studying charge transport properties of heterojunction interfaces for

electronic devices.

Keywords: OFET, Selective Dissolution, Efficiency, Inter-Diffusion, P3HT Polymer,

Charge Carrier Mobility, Donor, Acceptor




Electrochemical Performance of 3-D Hierarchical Magnetite Tremella

H. S. Mulla#, U.M. Chougale*, S.S. Patil, V. J. Fulari*

Holography and Materials Research Laboratory, Department of Physics,

Shivaji University, Kolhapur.416 004, Maharashtra, India

Abstract

Hierarchical nanostructured magnetite (Fe3O4) has been synthesized via a facile electrodeposition

method from additive free nitrate bath at 60oC. The as prepared thin films were characterized for its

structural, morphological and electrochemical properties. X-ray diffraction revealed the formation of

polycrystalline, orthorhombic magnetite phase. Morphological characterization showed the

hierarchical growth of interconnected nanosheets to form tremella like structure. The electrochemical

properties of the electrodes were studied in aqueous NaOH electrolyte. Remarkably, the as-

synthesized Fe3O4 tremella like nanosheets exhibited a higher specific capacitance of 549 F/g at the

scan rate of 5mV/s. The capacitance retention of tremella like magnetite was around 81 % after 500

cycles at a scan rate of 100 mV/s. EIS study supports the cyclic voltammetry results. The findings

suggested that the low-cost magnetite nanostructures can be recognized as a high performance

electrochemical capacitor electrode material.

Fig. (a) SEM image and (b) Stability of electrodeposited magnetite thin films

Keywords: Supercapacitor; metal oxides; magnetite tremella; electrodeposition.

*Corresponding author(s): [email protected] (VJF), [email protected] (UMC)

#Presenting author: H. S. Mulla

Acknowledgement: Authors are grateful to DAE-BRNS, Govt. of India for providing the

financial support through research project No. 2013/37P/41/BRNS/1976

References:

1. U.M. Chougale, V.J.Fulari, Mat Sci Semicon Proc, 27, 682 (2014)

2. P.M. Kulal, D.P. Dubal, C.D. Lokhande, V.J. Fulari, J. Alloys Compd 509, 2567 (2011)

( (


Diurnal Variations of INSAT – 3D Satellite Measured Brightness

Temperatures Associated with Intensity Changes of Tropical Cyclones over

North Indian Ocean

Narendra Mohanrao Shirsath1, 2, #

, Medha Deshpande2, Danish Hussain

3

1Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune - 411007

2Indian Institute of Tropical Meteorology, Pashan, Pune - 411008 3MOSDAC-SAC-ISRO, Bopal, Ahmedabad, Gujarat - 380058

#[email protected]

Abstract

A tropical cyclone (TC) intensity change is an important problem in TC research community.

Accurate prediction of intensity is essential in disaster management point of view. As TCs occurs over

Ocean, satellite data fills the gap in the coverage of observational data and are the best tool for

monitoring the status, development, maturity, and decay of TCs. In this paper, diurnal variations of

INSAT-3D satellite measured cloud top temperatures as well as rainfall for TCs over North Indian

Ocean (NIO) is studied. Here, we select two recent cyclones wiz TC Fani (26th April - 5

th May) over

Bay of Bengal and TC Vayu (10th

-17th

June) over Arabian Sea both in 2019. Aim is to understand the

diurnal variations of brightness temperature (BT), rainfall and its association with TC intensity.

Diurnal variation of TC is an important element of TC dynamics and has a relevance with TC

structure and intensity change. The Infrared (IR) BT and rainfall data is obtained from the INSAT-3D

spacecraft of Indian Space Research Organization through MOSDAC site of Space Applications

Center. The INSAT-3D spacecraft operational products of IMAGER channel used in this study are

L1B_STD_TIR1 (10.3-11.3 µm, Spectral Range) for IR BT and L2B_HEM for Rainfall both has a

horizontal resolution of 0.04° × 0.04° between 50°N and 50°S, with a temporal resolution of half

hour. Best track data of TC provided by India Meteorological Department (IMD) is used to get 3

hourly records of TC location and intensity. Diurnal variations in IR BT associated with TC cloud top

temperature is evaluated using average temperatures within a fixed radius or annulus. Also diurnal

variation in the areal extents of TC clouds is studied using cloud-top temperatures below specific

thresholds. Here, IR BT <=235 K was chosen as a threshold for deep convection based on different

diurnal cycles of IR BT. Diurnal variation in TC seems to have a large influence on the development

of deep convection which needs to be explored further. Analysis of diurnal variation of brightness

temperature, rainfall and intensity of TC will enhance our understanding and this can be applied for

better prediction.



Structural and Optical Properties of Rare Earth Doped GaN Monolayer:

Density Functional Study

Neeta Bisht, Sandhya Wakhare and Mrinalini D. Deshpande

Department of Physics, H.P.T. Arts and R.Y.K. Science College, Nashik, Maharashtra - 422005, India.

Abstract

Gallium Nitride (GaN) crystal has attracted much attention due to its unique properties such as wide

band gap (3.4eV), strong bonding and excellent piezoelectric and optical properties [1]. Over the past

decade, two dimensional GaN monolayers which are similar to graphene has been extensively studied

due to their potential application in nanoelectronics, optoelectronics and photonic devices [2]. The

various dopants and defects modulate the electronic, magnetic and optical properties of GaN sheet [3].

In the present work we have performed a comprehensive investigation of the structural, electronic,

optical properties of RE (Ce, Nd, Eu, Gd, and Dy) doped GaN monolayer using first-principles

calculations. It is found that Ga substituted with RE is more favourable as compared to N substitution

with RE. Doping of RE elements convert non-magnetic GaN monolayer to magnetic. Gd doped GaN

monolayer shows highest magnetic moment of 7µB. Substitution doping of the RE atoms for Ga atom

has significant effect on the electronic properties of GaN monolayer, results shows that the rare earth

element doped GaN sheet forms a direct band gap semiconductor. Optical spectra of the rare earth

doped GaN sheet is obtained in which we have observed the Red shift in the peak of RE doped GaN

monolayer as compared to pristine monolayer GaN. Our results may provide a reference for

modifying the material property of GaN monolayer and designing nanoelectronic and spintronic

devices.

Keywords: GaN monolayers, RE, doping, optical properties, rare earth elements.

#: Presenting author [email protected]

*: Corresponding author [email protected]

Acknowledgement: All the authors would like to acknowledge infrastructural and

computational facilities provided by H.P.T. Arts & R.Y.K. Science College, Nashik,

Maharashtra-422005, India.

References:

[1] S. Nakamura, T. Mukai, and M. Senoh. 1994. Appl. Phys. Lett., 64, 1687-1689. [2] Nocona Sanders, Dylan Bayerl, Guangsha Shi, Kelsey A. Mengle Nano Lett, 25 Oct 2017.

[3] N. Sanders, D. Bayerl, G. Shi, K. A. Mengle, and E. Kioupakis, ACS Nano Lett,7b03003.


Brønsted Amino Acid Ionic Liquid ProH2PO4: A Highly Efficient Reusable

Green Catalyst for Neat Synthesis of Amidoalkyl Naphthols

Nitin R. Rode,# Aafaq A. Tantray, Santosh S. Terdale*

Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind, Pune-411 007,

Maharashtra, India,

E-mail: [email protected]

Abstract

The multicomponent reaction (MCRs) is an efficient and convenient method for one-pot

synthesis of different organic compounds. Here, we report the synthesis 1-amidoalkyl 2-naphthols

derivatives in three components one-pot reaction involving β naphthol, amides, and aromatic

aldehydes, in the presence of proliniumdihydrogen phosphate (ProH2PO4),a Brønsted amino acid

ionic liquid (AAIL)as highly efficient green catalyst is described.Thecatalyst is easy to prepare,

inexpensive, and can be easily isolated and reused.The reusability of a catalyst for four consecutive

cycles without decrease in catalytic activity has been studied.The variety of 1-amidoalkyl 2-naphthol

derivatives were synthesized under solvent-free conditions.The synthetic procedure is a simple,

environmentally friendly greener and safer process, short reaction time, easy workup, offers a pure

product withanexcellent yield.

Keywords: multicomponent reaction (MCRs), amino acid ionic liquid, 1-amidoalkyl 2-

naphthol.

#: Presenting author: [email protected] *: Corresponding author: [email protected]


Effect of Nb2O5 Blocking layer on ZnO Photoanode based

Dye Sensitized Solar Cells

Niyamat I. Beedri , Abhijit T. Supekar Sandesh R. Jadkar

, Habib M. Pathan

Advanced Physics Laboratory, Department of Physics,

Savitribai Phule Pune University, Pune – 411 007, India

Abstract Bilayered TiO2/Nb2O5 photoanode for dye sensitized solar cell (DSSC) application is well reported

[1-3].The present work deals with the study of effect of Nb2O5 blocking layer on the performance of

ZnO photoanode based DSSCs. ZnO is commonly used oxide semiconductor in fabrication of DSSC.

Nb2O5 has also been considered as a promising oxide semiconductor for DSSC. since Nb2O5 is a

wide-band-gap n-type semiconductor with a higher conduction band than ZnO. The recombination of

electron are reduced in bilayered Zno/Nb2O5 photoanode as compared to the singlelayered ZnO

photoanode. Once the electrons get transferred from lowest unoccupied molecular orbital level of dye

to the conduction band (CB) of ZnO, then the possibilities of recombination of electrons with

oxidized dye molecules or oxidized redox couple are reduced. This is because the CB position of

Nb2O5 is higher than that of ZnO, which blocks the path of electrons. We further analyzed the

electron recombination properties in the photoanodes of single layer ZnO and bilayered Zno/ Nb2O5

by utilizing electrochemical impedance spectroscopy (EIS). The EIS analysis (Bode Plot) for bi-

layered ZnO/Nb2O5 photoanode show shift of the signature peak corresponding to interfacial electron

recombination towards low frequency region as compared to single-layered ZnO photoanode. Thus,

there is increase in lifetime of electrons in bilayered Zno/Nb2O5 photoanode, confirming reduction in

recombination reactions as compared to the ZnO.

Figure : Bode plots of DSSCs prepared using N3-sensitized ZnO and ZnO/Nb2O5

photoanode

Keywords: Dye sensitized solar cell , Bilayered, ZnO/Nb2O5, Photoanode


References:

[1] P. Du, L. Song, J. Xiong, Y. Yuan, L. Wang, Z. Xi, D. Jin, J. Chen, Electrochem. Commun. 25,

46-49, (2012)

[2] E. Barea, X. Xu, V. Gonzalez-Pedro, T. Ripolles-Sanchis, F. Fabregat-Santiago, J. Bisquert,

Energy. Environ. Sci. 4, 3414-3419 (2011)

[3] N. I. Beedri, P. K. Baviskar, V. P. Bhalekar, C. V. Jagtap, Inamuddin, A. M. Asiri, S. R. Jadkar, H

.M. Pathan, Physica Status Solidi (A) 215, 1800236, (2018)

https://www.worldscientific.com/doi/abs/10.1142/S0217979218400465?journalCode=ijmpb


Effect of Cerium Oxide Nanoparticles on Seed Germination of Pulses

Pooja Deshpande#, Santoshi Khirid

# and Sunita Bhagwat*

Department of Physics, AbasahebGarware College, Karve Road, Pune 41104

Abstract

Now-a-days nanomaterials have attracted an attention in the sectors of agriculture. Cerium oxide

nanoparticles have been synthesizedusing sol-gel (sample a) and hydrothermal method (sample b) to

observe the effect of morphology on seed germination of pulses. This effect was observed by

treatment with CeO2 NPs (sample a and b) in comparison with untreated seeds. The structural

properties of CeO2 NPs were investigated by X-ray diffraction technique (XRD) which confirms

cubic structure ofCeO2 NPs. Optical studies reveals band gap of material to be around 3.61eVfor both

the samples.SEM reveals spongy microstructure for sample b. In this study, we examined effect of

CeO2 NPs dosage on seed germination of pulses. Therefore, this experiment designed to study the

effect of CeO2 NPs on germination percentage, germination rate, mean germination time, root length,

fresh and dry weight of seedling for pulses. Three different concentrations of CeO2 NPs were

examined at seed germination stage. The results showed that pulses revealed different dosage

response to CeO2 NPs on germination percentage and the measured growth characters. Germination

rate values are found to be enhanced in response to CeO2 NPs.

(A) (B)

Figure: (A) XRD and (B) SEM with different resolutions of CeO2 NPs for sample a and b

Keywords: CeO2 NPs, Seed germination

#: Presenting author:[email protected]


Reference:

1. R. Bala, A. Kalia and S.S. Dhaliwal, J. Soil Science and Plant Nutrition, 19, 379-389 (2019).

(a)

(b)

(a)

(b)


Solvothermal Synthesis of Monodispersed Superparamagnetic Magnetite

Nanoclusters for targeted drug delivery

P. P. Waifalkara#

, S. D. Dholeb, P. S. Patil

a*

aThin Film Materials Laboratory, Department of Physics,

Shivaji University, Kolhapur-416004, bDepartment of Physics, Savitribai Phule Pune University, Pune, 411 007

Abstract Motivated by the potential use of iron oxide nanoclusters in biomedical applications, we have

developed a modified solvothermal method to produce monodisperse magnetite (Fe3O4) nanoclusters

using iron acetylacetonate (Fe(acac)3) as a precursor, oleic acid, oleylamine as surfactants and

ethylene glycol (EG) and diethylene glycol (DEG) as both reducing agent and solvent. In this method,

the nanocluster sizes can be readily tuned in a range from 23 to 41 nm by varying the EG and DEG

volume ratios. The effect of EG and DEG solvents concentration on the morphology and size of the

nanoclusters were carefully investigated. The structural study reveals the as-synthesized magnetite

nanocrystal of nearly same average crystallite sizes. In addition, the results show that oleyl groups,

carboxylic acid group and amine groups on the surface of nanoclusters, which are beneficial for

further targeted drug delivery applications. The analysis of the magnetic properties revealed that the

as-synthesized nanoclusters are superparamagnetic at 300 K.

Figure: TEM images and corresponding SAED patterns

Keywords: Iron Oxide, Magnetite, solvothermal, drug delivery.




Oleic Acid Coated Hydrophilic Nano-Scale Zinc Ferrite for Magnetic

Hyperthermia Study towards Biomedical Applications

Prashant B. Kharata#*

, Sandeep B. Somvanshib, and K.M. Jadhav

aDepartment of Physics, Vinayak Vidnyan Mahavidyalaya, Nandgaon Khandeshwar, Amravati -

444708, Maharashtra, India bDepartment of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad - 431004,

Maharashtra, India

Abstract Nanoscale spinel zinc ferrite (ZNF) was prepared by sol-gel auto-ignition route and subsequently its

surface was modified by oleic-acid (OA) coating. The pristine and surface modified ZNF

nanoparticles (UC-ZNF and OA-ZNF) were characterized by standard techniques. XRD patterns of

both the samples ensured the nanocrystalline monophasic cubic-spinel lattice structure with ‘Fd-3m

space-group’. FT-IR spectra revealed the presence of vibrational frequency-modes of spinel structure

and successful coating of OA over ZNF. The nano-size spherical grains with some agglomeration and

OA coating over ZNF were visualized in FE-SEM images. The hydrophobic-to-hydrophilic surface-

transition of ZNF was confirmed by water contact-angle measurements. The BET surface-area and

distribution of pore-radius was evaluated by recording N2-isotherms. The M − H plots confirmed the

superparamagnetic nature of both the samples. Optical properties were studied by UV–Vis and PL

spectroscopy techniques. The colloidal-stability and distribution of particle-sizes were estimated by

zeta-potential and DLS measurements. Magnetic hyperthermia studies were carried out for different

concentrations (2, 4, 6, 8 and 10 mg/mL) of both the samples. The biocompatible nature of both the

samples was studied by cell-viability studies. All these results ensure the implementation of OA-ZNF

nanoparticles with minimum dose rate (8 mg/ mL) in magnetic hyperthermia therapies for cancer

treatment.

Figure: Concentration dependent magnetic induction heating curves for (a) UC-ZNF and (b) OA-

ZNF NP's.

Keywords: Surface modified ZnFe2O4; Hydrophilic surface; Magnetic hyperthermia; BET-

BJH analysis; Superparamagnetic; Cell viability.




Acknowledgement: The author Dr. Prashant B. Kharat is thankful to Dr. R. S. Ningthoujam

and Dr. P. A. Hassan of Chemistry Division, Bhabha Atomic Research Centre, Mumbai, for

providing induction heating measurement facilities. Centre for Advanced Life Sciences,

Deogiri College, Aurangabad for Cytotoxicity study.

References:

1. Kharat, Prashant B., Ashok V. Humbe, Jitendra S. Kounsalye, and K. M. Jadhav. "Thermophysical

investigations of ultrasonically assisted magnetic nanofluids for heat transfer." Journal of

Superconductivity and Novel Magnetism 32, no. 5: 1307-1317 (2019).

2. Sandeep B. Somvanshi, Mangesh V. Khedkar, Prashant B. Kharat, and K. M. Jadhav. " Influential

diamagnetic magnesium (Mg2+

) ion substitution in nano-spinel zinc ferrite (ZnFe2O4): Thermal,

structural, spectral, optical and physisorption analysis." Ceramics International (2019).

3. Sandeep B. Somvanshi, Prashant B. Kharat, Mangesh V. Khedkar, and K. M. Jadhav. "Hydrophobic to

hydrophilic surface transformation of nano-scale zinc ferrite via oleic acid coating: Magnetic

hyperthermia study towards biomedical applications." Ceramics International (2019).

4. Kharat, Prashant B., S. D. More, Sandeep B. Somvanshi, and K. M. Jadhav. "Exploration of

thermoacoustics behavior of water based nickel ferrite nanofluids by ultrasonic velocity method."

Journal of Materials Science: Materials in Electronics 30, no. 7 : 6564-6574 (2019).


An environmentally friendly and efficient route for synthesis of rod shaped

GO/MgO2 nanocomposite

Prashant M. Kakade1, Avinash R. Kachere

1, Shivaji V. Bhaosle

2, Sachin R. Rondiya

3,

Bharat B. Kale4, Adinath M. Funde

3, Sandesh R. Jadkar


1*


Maharashtra, India. 2Department of Physics, Sir Parshurambhau College, Tilak Road, Pune-411030

3School of Energy Studies, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007, India.




Abstract

We report the synthesis of rod shaped nanocomposites of MgO2 and graphene oxide. The

concentration of Mg was varied in graphene oxide to study its effect on the formation of nanorods.

Preparation of graphene oxide is carried out using modified Hummer’s method. Addition of different

amount of Magnesium powder resulted in complete reduction of GO and formation of nanorods like

morphology on the GO sheets.The growth mechanism of MgO2 nanorods on graphene oxide sheets is

studied by using X-ray diffraction, Raman spectroscopy, EDS, FTIR and FESEM techniques.

Reduction of graphene oxide by adding Mg powder is shown by XRD data with formation of cubic

phaseMgO2. Presence of secondary hexagonal phase MgO4 is also detected in XRD study. Raman

spectroscopy, EDS study confirms the presence of graphene oxide in the GO/MgO2 nanocomposite.

Formation of nanorods of MgO2 is shown by FESEM results. This approach provides a simple and

straightforward synthesis technique to deposit MgO2 nanoparticles onto the graphene oxide sheets and

may be readily extended the routes for the preparation of other type of hybrids based on GO sheets for

different technological applications.

Keywords: GO/MgO2 nanocomposite, Nanoflowers, Energy storage application.


Development of Schottky junction type betavoltaic nuclear battery using

SiC nanowires

Pravin Walave, Ambadas B. Phatangare, Sanjay D. Dhole, Shailendra S. Dahiwale and

Vasant N. Bhoraskar

Microtron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune–

411007, India Presenting Author: [email protected], Corresponding Author: [email protected]

Abstract

Randomly oriented nanowires of β-SiC, a wide gap semiconductor, have been used for the

development of a betavoltaic nuclear battery. A sandwich-type metal/ β-SiC nanowires/metal

structure, which gives build-in contact potential difference was used to investigate the effect of beta

radiation. The sandwiched structure is integrated by immobilized β-SiC nanowires on Si substrate

with radioisotope P-32 planar source on Ni substrate (Ni-P32

/SiC/Al). Under irradiation with beta

particles with end point energy ~ 1.71 MeV and a source with activity of ~ 22.5 µCi, the structures

shows open-circuit voltage of 1.471 V and short-circuit current of 0.1µA. The β-SiC nanowires

exhibited a great potential for the development of betavoltaic batteries due to its excellent property for

capturing beta particles and transportation of charge carriers. By connecting a series of such

betavoltaic nuclear batteries a voltage up to 20 volts can be buildup with current limit to 1A. The

important role played by the sandwich-type metal/semiconductor/metal structure has been observed

under a build-in electrical field through contact potential difference between Ni and Al. The enhanced

betavoltaic mechanisms of the metal/semiconductor/metal structure and its optimized design are

presented in this work.

Keywords: SiC nanowires, betavoltaic nuclear battery, sandwiched structure, radioisotope

References:

1. D. Linden and T. B. Reddy, Handbook of Batteries, McGraw-Hill, 3rd

ed., 2002.

2. A. Thomas, “Nuclear Batteries: Types and Possible Uses”, Nucleonics, vol. 13(11), pp. 129-133,

Nov. 1955.

3. Chen, Kai, et al. “Synthesis of SiC nanowires by thermal evaporation method without catalyst

assistant.” Ceramics International 39.2 (2013): 1957-1962.

4. Qiao, Da-Yong, et al. “A micro nuclear battery based on SiC Schottky barrier diode.” Journal of

Microelectromechanical Systems 20.3 (2011): 685-690.


ZnS Photoanode for DSSCs via Chemical Route

Priyanka M#. , Habib M. Pathan*


Savitribai Phule Pune University Pune-411007

Abstract

ZnS films were prepared by cost-effective and simple SILAR (Successive Ionic Layer Adsorption and

Reaction) method. The low crystalline/amorphous nature of ZnS is exploited as an advantage in the

sense that it provides more uniform coverage of the FTO substrate by ZnS without gaps between the

grains. The amorphous/low crystalline nature of ZnS photoanode was confirmed from the XRD

pattern. Optical studies were done and the absorption spectrum was studied for various SILAR cycles.

It was observed that as the number of SILAR cycles increases the bandgap of ZnS photoelectrode was

found to be decreasing. Optical studies of ZnS thin films has been carried out to find out Urbach

Energy levels of SILAR deposited ZnS thin films. FESEM morphology of ZnS photoelectrode was

showing a nano-porous nature which seems good for a DSSC photoanode. Energy Dispersive X-ray

Spectroscopy (EDS) has been used to quantitatively measure the sample stoichiometry. ZnS based

DSSCs have been built and their photocurrent, open-circuit voltage, fill factor and efficiency have

measured under one sun. Electrochemical Impedance Spectroscopy (EIS) was applied to investigate

electrochemical ZnS based DSSC. The effective electron lifetime was derived for various cycles of

ZnS films. The influence of cell parameters such as the ZnS layer thickness, charge transfer resistance

of the platinum counter electrode and the lifetime of the photo injected electrons on the Impedance

spectra were studied both experimentally and theoretically. Finally, it is shown that EIS is a

measurement method suited well for the investigation of the long-term stability of DSSC as change of

the inner cell parameters can be revealed.

2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25

0

1x109

2x109

3x109

4x109

5x109

6x109

7x109

8x109

he

V/c

m

Eg(eV)

ZnS(40)

ZnS(50)

ZnS(60)

ZnS(70)

Figure: Tauc plot for thickness varied ZnS films

Keywords: ZnS; SILAR; Urbach Energy; Dye-sensitized solar cell; electrochemical characterization.

#Presenting Author: [email protected]

*Corresponding author:[email protected]

Acknowledgement: Authors are thankful to DST-SERI for financial support.


Synthesis and characterization of ZnO-GO nanocomposites in the view of

solar cell application

Priyanka P. Dani1, Archana R. Kanwade

2, Sandhya R. Chande

1, Prashant M. Kakade

1,

Avinash R. Kachere1, Sandesh R. Jadkar


1, Shivaji V.

Bhaosle2*


Maharashtra, India. 2Department of Physics, Sir Parshurambhau College, Tilak Road, Pune-411030

3Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007, India.


Abstract

In this work we reported synthesis of a zinc oxide/graphene oxide (ZnO/GO) nanocomposite with

different weight percentage doping of GO i.e., 5 & 10 wt % by using hydrothermal technique.

Separate synthesis of ZnO and GO was carried out using sol-gel and Modified- Hummer’s method

respectively. The microstructure and morphology of the synthesized nanocomposite was studied by

X-ray diffraction (XRD), Raman Spectroscopy and Scanning Electron Microscopy (SEM) techniques.

The XRD analysis of ZnO, GO and ZnO/GO nanocomposite shows that, the average crystalline size

of ZnO nanoparticles is nearly 22-23 nm and average crystalline size of ZnO-GO (5 wt %)

nanocomposite is 26.8 nm. The surface morphology of ZnO/GO nanocomposite is carried out using

SEM. Application of prepared nanocomposite will carried out in the view of solar cell application.

Keywords: ZnO/GO nanocomposite, Hydrothermal technique, Solar cell.


Impact of Post-Annealing Process onto RF sputtered CuInGaSe2 Thin film

Sachin Desarada#a

, Kalyan Chavan, and Nandu Chaure*a

aElectrochemical Lab, Department of Physics, Savitribai Phule Pune University, Pune, 411007

bDepartment of Physics, Ahmednagar College, Ahmednagar, 414001

cIndian Institute of Science Education and Research , Institution Address, Pin Code

Abstract Copper indium gallium selenide (CIGS) is a group I-III-VI2 chalcopyrite compound semiconductor

which is the promising candidate for solar cell absorber layer. The highest efficiency for the small

area single-junction CIGS solar cell reported is 23.35 % [1]. The energy band-gap of the CIS can be

tuned by replacing indium atoms by gallium in the range of 1.05 to 1.70 eV (CIS – 1.05 eV and CGS

– 1.70 eV) to achieve the best possible theoretical cell efficiency [2]. In this work CIGS thin films are

deposited using RF magnetron sputtering at room temperature. The samples are annealed in the rapid

thermal processing (RTP) chamber for different temperatures in nitrogen ambient at atmospheric

pressure. The annealed samples were characterize thoroughly to study the various properties.

Structural characterization was carried out using Raman spectroscopy and X-Ray diffraction (XRD)

technique. Amorphous films were obtained at room temperature, however, upon RTP annealing films

shows the significant improvement in the degree of crystallization. (112) highly preferentially

oriented CIGS films were obtained upon RTP annealing. Chalcopyrite CIGS compound phase in as-

deposited as well as in annealed films confirmed by the Raman spectra analysis. The optical bandgap

estimated ~1.36 eV for the annealed sample using UV-Vis measurements. Elemental composition was

obtained using the elemental dispersive X-ray (EDAX) analysis shows the stoichiometry of the CIGS

samples retained even after RTP annealing, the growth of samples was observed by using FESEM

was uniform, uniform, compact and void-free surface morphology.

d)

Inte

ns

ity

(a

rb.

un

it)

c)

b)

20 25 30 35 40 45 50 55 60

2 theta (degree)

a)

Figure 2 X-ray diffraction graphs for samples a) as-deposited and annealed at b) 300 ℃ c) 400 ℃ and

d) 500 ℃.

#: Presenting author: [email protected] *: Corresponding author: [email protected]

References : [1] n. motoshi et.al., "Cd-Free Cu(In,Ga)(Se,S) 2 Thin-Film Solar Cell With Record Efficiency of 23.35%,"

IEEE Journal of Photovoltaics, vol. 9, no. 6, pp. 1863-1867, 2019.

[2] O. Lundberg, et. al., "The effect of Ga-grading in CIGS thin film solar cells," Thin Solid Films, Vols. 480-

481, pp. 520-525, 2005.


Supercapacitive Performance of Electron Irradiated Polyaniline Thin

Films

S. T.Sadigale1#

, U. M. Chougale1*

, M. C. Rath2, V. J. Fulari

1*

1Holography and Materials Research Laboratory,

Department of Physics, Shivaji University, Kolhapur.416 004, Maharashtra, India 2Radiation and Photochemistry Division, BARC, Mumbai-400 085

Abstract

In present work, polyaniline (PANI) thin films were prepared by electrochemical polymerization and

were radiated with 10 MeV electron beam (EB) at the radiation doses of 10, 20, 30 40 and 50 kGy.

The structural and morphological changes after electron irradiation was analyzed by various physico-

chemical techniques such as XRD, FTIR, SEM and wettability measurement. The electron beam

irradiation causes chain scission and cross-linking in PANI. Irradiation increase the crystallinity and

average size of fibers. The effect of electron irradiation on the electrochemical properties PANI thin

films were studied with cyclic voltammetry, charge discharge and EIS techniques in H2SO4

electrolyte. Increase in irradiation dose decreases the specific capacitance of PANI electrodes.

Furthermore, irradiation improves the performance of electrodes with 15% enhancement in stability

after 500 CV cycles. Subsequently EIS study reveals decrease in electrode resistance after electron

irradiation. The study confirms the suitability of the electron irradiated polyaniline electrodes with

increased stability for electrochemical energy storage application with easy to prepare, economic,

environmentally benign route.

Keywords: Supercapacitors; polyaniline; electrodeposition; electron irradiation

*Corresponding author(s): [email protected] (VJF), [email protected] (UMC)

# presenting author: S.T. Sadigale

Acknowledgement: Authors are grateful to DAE-BRNS, Govt. of India for providing the

financial support through research project No. 2013/37P/41/BRNS/1976

References:

1. U.M. Chougale, M. C. Rath, V.J.Fulari, IJSER, 6,12, 78 (2015)

2. U.M. Chougale, J.V. Thombare, A.B. Kadam, V.J.Fulari, ICEETS, 1078 (2013)

3. S. P. Mali, S.A. Gosavi, A.S. Inamdar, U.M. Chougale, V.J. Fulari, Advanced Science

Letters, 21 , 8, 2534 (2015).


Electrochemically deposited Copper oxide thin films for Supercapacitor

Application

Saima G. Sayyed1 and Arif V. Shaikh

1,2

1Department of Electronic Science & Research Center,

L.V.H Arts, Science and Commerce College Panchavati, Nashik-03. 2Department of Electronic Science & PG Center,

Poona College of Arts, Science and Commerce, Camp, Pune, India.

Abstract

In the recent era of technical advances, supercapacitors have attracted major attention because

of its long life cycle, large specific capacitance, high energy and power densities. supercapacitors

become promising device which contributes to society by its low power and high power applications.

Among the various metal oxides, Copper oxide is well known and studied material as an electrode in

energy storage system due to their low cost, high theoretical capacitance i.e. 1800 F/g and

environmental friendliness. In our present work, copper oxide thin film was prepared on copper

substrate by potentiodynamic mode of electrodeposition. The deposition was carried out by

repeating number of cycles in potential region between -1V to 1V at different scan rate. The

effect of calcination on the electrode was examined. Electrochemical performance of thin electrode

was evaluated by using a cyclic voltammetry measurement and charge/discharge test in different

electrolytes i.e. 1 M Na2SO4 and 1M KOH. The material exhibits a large pseudo-capacitance, hence it

will be good candidate material for supercapacitor electrode.

Keywords: Copper oxide, Electrochemical deposition and Supercapacitor electrode.


Synthesis and Characterization of High Tc Superconducting- BSCCO and

YBCO samples

Sakshi Patila#

and C.S. Yadavb*

aSandip University, Trimbak road, Mahiravani, Nashik- 422213

bSchool of Basic Science, Indian Institute of Technology (IIT), Mandi, Himachal Pradesh,175005.

Abstract

Since the discovery of the high-temperature superconductors (HTS) in the late 1980s, the

technological research has been focused on producing HTS materials in sufficient quantities to make

their use economically viable and on optimizing their properties in relation to a wide range of

advanced applications. Present work deals with the synthesis and characterization of the high Tc

superconducting materials. The samples YBCO(123), BSCCO(2212) and BSCCO(2223) were

prepared using solid state method of synthesis[1]. XRD analysis of BSCCO compound reveals extra

phase composition whereas YBCO crystalizes in single phase. Magnetic measurements of YBCO

sample was done using Quantum Design MPMS 3, which shows superconducting temperature (Tc)

around 86 K.

Figure: Rietveld refinement of YBCO(123)

Keywords: High Tc Superconductors, Meissner effect, superconducting temperature



Acknowledgement: Dr. Jalim Singh, Dr. Anil N. Kulkarni, Sonu Chillar, Sheetal Moun, Shailja

Sharma

References: 1. Superconducting properties of Bi2ÿxPbxSr2Ca2Cu3Oy system derived via sol±gel and solid state routes S.A.

Halim*, S.A. Khawaldeh, et al , material chemistry and physics 61 (1999), 251-259


Effect of simulated microgravity on cell surface properties of

Staphylococcus aureus bacteria

Sandhya Singha#

, G.R Kulkarnia and P. B Vidyasagar

a*

aDepartment of Physics, S.P.P U, Pune 411007

Abstract 3D clinostat is an important ground based tool which can be used to study the fundamental changes in

cells in microgravity environment, and these findings can be very helpful to design and sustain life

support systems in future manned space missions. Changes in cell surface properties of

staphylococcus aureus , such as cell surface hydrophobicity(CSH), autoaggregation and cell

membrane using fourier transform infrared spectroscopy in simulated microgravity using 3D clinostat

were studied. It was observed that the simulated microgravity condition causes changes in these cell

surface properties of staphylococcus aureus, it can be speculated that bacterial behavior is affected

due to microgravity and our study provides an interesting perspective of this aspect.

Keywords: Cell surface hydrophobicity, Staphylococcus aureus, Autoaggregation, Simulated

Microgravity, FTIR.



Acknowledgement:

The authors are grateful to the Board of College and University Development (BCUD),

Savitribai Phule Pune University, Pune 411007, Maharashtra, India, and the Indian Space

Research Organization (ISRO), India, for the financial support.

References:

1. Briegleb, W.: Some qualitative and quantitative aspects of the fastrotating

clinostat as a research tool. ASGSB Bull. 5(2), 23–30 (1992.

2. Anwar A. Abdulla, Thikra A. Abed and A. M. Saeed ; British Microbiology Research Journal

4(4): 381-391, 2014.

3. Zdenek Filipa, Susanne Herrmanna, Jaromir; Microbiological Research 159 (2004) 257.


Monsoon low-level wind characteristics over a high altitude site,

Mahabaleshwar, using high-resolution radiosonde observations

Sanket.R.Bhiogade1,2, #,*

,Leena.P.P 2, *

, K.K.Dani2, V.Anil Kumar

2and G.Pandithurai

2

1Savitribai Phule Pune University, Pune, 411007,

2Indian Institute of Tropical Meteorology, Pune, 411008

Abstract

Monsoon dynamics play an important role in determining the amount of precipitation/rainfall across

the country during the south-west monsoon (Raman et al., 2011). Many components of the monsoon

system have a significant influence on monsoon variability over the Indian sub-continent. One of

them is the strong cross-equatorial wind flow in the lower troposphere, which is known as the

monsoon low level jet (MLLJ). In the present work, low level wind characteristics during monsoon

season over a high altitude site, Mahabalehswar, has been studied using high resolution radiosonde

observations. High Altitude Cloud Physics Laboratory (HACPL) placed at Mahabaleshwar (17.92° N,

73.65° E) is at a height of 1378 m above mean sea level (MSL) where daily radiosonde launch is

taking place at 12 GMT . Monsoon Low-Level Jet (MLLJ) characteristics such as jet core, jet speed

and depth has been analyzed for 03 years (2016-2018) of data set and compared with ECMWF

(European Centre for Medium-Range Weather Forecasts) Re-Analysis (ERA) Interim datasets . The

core speed, core height and depth of the low-level jet are more than 15m/s, around height of 3km and

2.8km. We have also estimated the vertical shear in zonal wind which showed clear altitude

variability with positive shear below 3km and negative above that height. Detail analysis and statistics

will be presented in conference.

Keywords: Monsoon low-level winds, high-altitude site, radiosonde

#Presenting author: [email protected]

*Corresponding author: [email protected] ,[email protected] Acknowledgement: Thankful to Director, IITM, HoD, SPPU, Pune, HACPL team

References

1. Raman, M., et al. "Intriguing aspects of the monsoon low-level jet over Peninsular India

revealed by high-resolution GPS radiosonde observations." Journal of the Atmospheric

Sciences 68.7 (2011): 1413-1423.

2. Joseph, P. V., and S. Sijikumar. "Intraseasonal variability of the low-level jet stream of

the Asian summer monsoon." Journal of Climate 17.7 (2004): 1449-1458.

3. Xavier, Anu, et al. "The role of monsoon low‐level jet in modulating heavy rainfall

events." International Journal of Climatology 38 (2018): e569-e576.


Influence of selenisation temperature on the growth of (Cu,Ag)0.5InSe2 thin

films by two – stage process

Shaik Babujani a, #

, G. Hema Chandra a,*

, Mukul Gupta b

a Thin Film Laboratory, Department of Physics, Visvesvaraya National Institute of Technology,

Nagpur – 440 010, Maharashtra, India b UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore-452 017, India

Abstract

CuInSe2 thin film is a promising chalcopyrite semiconductor for low-cost and high efficiency solar

cell device fabrication due to high optical absorption coefficient of 104 cm

-1 [1]. However, owing to its

low energy gap (1.04 eV), a new material of Ag-doped CuInSe2 to form Cu1-xAgxInSe2 has been

researched, allowing band gap between CuInSe2 (Eg = 1.04 eV) [2] and AgInSe2 (Eg = 1.24 eV) [3]. In

this work, the effect of selenisation temperature on the growth of (Cu,Ag)0.5InSe2 thin film was

studied using two – stage process comprising of precursor deposition using (In/Cu/Ag/Se2) x 3 stack

by e-beam evaporation in high vacuum and its selenisation at various temperatures (300 ̊C – 500 ̊C)

for 30 min. The XRD results of CAISe films at 475 ̊C for 30 min indicates that films are single phase,

tetragonal chalcopyrite structure with preferred orientation along (112) plane, with lattice parameters

a = 5.945 Å, c = 11.738 Å, matched with reported literature [4]. EDS analysis reveals that the films

grown are nearly stoichiometric. FESEM images have shown densely packed grains with mean size of

583 nm. Raman results confirms that phonon modes obtained at 67 cm-1

, 171 cm-1

and 214 cm-1

are

corresponding to CAISe thin films.

Keywords: (Cu,Ag)0.5InSe2 thin films, Two – stage process, Electron beam evaporation, Selenisation

temperature.



References:

1. P. Malar, S. Kasiviswanathan, Sol. Energy Mater. Sol. Cells 88, 281– 92 (2005)

2. K.L. Chopra, S.R. Das, Thin Film Solar Cells (Plenum, New York, 1983), p. 417

3. G.V. Rao, G.H. Chandra, P.S. Reddy, O.M. Hussain, K.T.R. Reddy,S. Uthanna, Vacuum 67, 293–8

(2002)

4. G. Venkata Rao, G. Hema Chandra, P. Sreedhara Reddy, O. M. Hussain, K. T. Ramakrishna Reddy, S.

Uthanna Journal of Optoelectronics and Advanced Materials Vol. 4, No. 2, p. 387 – 392, June 2002.


One step multicomponent synthesis of N-Acyl-α-amino acid amide using

recyclable & eco-friendly solvent with trialkylamine as catalyst.

Shantanand M. Mathapati, Rutikesh Gurav, Shankar P. Hangirgekar

Department of Chemistry, Shivaji University, Kolhapur

District Kolhapur-436006(M.S.), India.

[email protected]

Abstract

Multicomponent synthesis of Aromatic/aliphatic carboxylic acids, aromatic aldehydes or ketones[1,2]

, primary amines[3,4] and isonitrile[1-5] in presence of trialkylamine as catalyst in PEG as recyclable

solvent for synthesis of N-Acyl-α-amino acid amide. This new methodology has advantages such as

operational simplicity, mild conditions, simple work-up procedure and high yield.

R1 OH

O

R3 R4

O

R5

NR2

NH2

R1

O

N

R2

R3

R4

HN

O

R5

R3N

PEG, 70-90°C

Figure: General reaction scheme

Keywords: Multicomponent reaction, aromatic aldehydes/ketones, Aromatic acids, primary

amines and trialkylamine, PEG.

#: Presenting Author: [email protected]

*: Corresponding Author: [email protected]

References

1. JOC, 2011, vol-76,#18, p-7632

2. Organic letters, 2005, vol-7, #1, p-47-50

3. Organic letters, 2012, vol-14, #2, p-648-651

4. Angewandte chemie-international edition, 2012, vol-51, #32, p-8037-8040

5. JOC,2011, vol-76, #7, p-2261-2264


Thionaphthoquinones as photosensitizers in ZnO based dye sensitized solar

cells.

Sharad A. Mahadika,b

, Amit S. Patila, Habib M. Pathan

b,*and Sunita Salunke-Gawali

a,*

aDepartment of Chemistry, Savitribai Phule Pune University, Pune, India-411007.

bAdvanced Physics Laboratory, Department of Physics,

Savitribai Phule Pune University, Pune, India-411007.

Abstract Two analogs of thionaphthoquinones photosensitizers, viz; AMT; 2-(2’- aminomethylthiophene)-3-

chloro-1,4-naphthoquinone, AET; 2-(2’-aminoethylthiophene)-3-chloro-1,4-naphthoquinone are

synthesized and characterized using various spectroscopic techniques. Molecular structure of AMT

studied by single crystal X-ray diffraction studies. The morphology, optical, electrochemical

properties, crystallinity of the photosensitizers loaded ZnO were investigated by FE-SEM, UV-visible

spectroscopy and J-V characteristics. A broad band of photosensitizers in UV region assigned to π →

π⃰ transition while a visible region band assigned to n → π⃰ charge transfer transition. Powder X-ray

diffraction (PXRD) pattern of ZnO photoanode confirmed the single phase hexagonal wurtzite

structure, without any impurity phase. Dye sensitized solar cells (DSSCs) on ZnO photoanode were

fabricated using AMT and AET photosensitizers to give short circuit current (Jsc) 0.17 and 0.22

respectively, the open circuit voltage (Voc) 0.21 and 0.22 respectively.

Figure: FE-SEM of ZnO photoanode (a) without water vapor treatment and

(b) with water vapor treatment.

.

Keywords: Thionaphthoquinone, Electron-hole pair recombination, Dye-sensitized solar cells, ZnO,

Chemical bath deposition.


*: Corresponding author: [email protected], [email protected]

Acknowledgement: Authors thankful to Department of Science and Technology,

Government of India for financial support vide Sanction order DST/TMD/SERI/S173

(G).


Role of cobalt doping on structural and optical properties of ZnO

nanocrystals

Sheetal Malvankar, Swapnil Doke and Shailaja Mahamuni*

Dept. of Physics, S. P. Pune University, Pune (India)- 411 007


Abstract Undoped and Co-doped ZnO nanocrystals (NCs) are synthesized by a wet chemical method. The

samples were characterized by X-ray diffraction (XRD), Optical absorption spectroscopy, X-ray

photoelectron spectroscopy and Raman spectroscopy. The XRD analysis showed well-crystallized

hexagonal wurtzite structure and crystallite size decreases with increase in Co concentration. The

optical band gap of doped ZnO NCs increases with increasing Co concentration. No other impurity

was found in ZnO NCs as depicted by XPS. Raman spectroscopic measurements indicate that

although the structure is distorted due to Co doping, impurity phase is not formed in NCs. The present

work has significance In summary, we have shown that the present wet chemical technique is suitable

for obtaining Co-doped ZnO NCs as dopant related phase was absent.

20 30 40 50 60 70 80

2 (Degree)

0% Co-ZnO

1% Co-ZnO

2% Co-ZnO

5% Co-ZnO

10% Co-ZnO

(201)

(103)

(110)

(102)

(101)

(002)

(100)

2%

0%

1%

5%Inte

ns

ity

(A

rb.

un

it)

10%

(a)

300 400 500 600 700

0% Co-ZnO

1% Co-ZnO

2% Co-ZnO

5% Co-ZnO

10% Co-ZnO

(b)

5%

10%

1%2%A

bs

orb

an

ce

(A

rb.U

nit

)

Wavelength (nm)

0%

354

352

349

347

344

0 200 400 600 800 1000 1200

(c)

O A

ug

er

O A

ug

er

Zn

Au

ger

Zn

KL

LZ

n L

MM

Zn

2p

1/2

Zn

2p

3/2

Co

2p

3/2

O1s

C1s

Zn

3p

Zn

3s

Inte

nsit

y (

Arb

. U

nit

)

Binding Energy (eV)

5% Co-ZnO

Zn

3d

200 300 400 500 600 700 800

(d) 0% Co- ZnO

2% Co- ZnO

5% Co-ZnO

10% Co-ZnO

400750

674

617

438

330

Inte

nsi

ty (

Arb

. U

nit

)

Raman Shift (cm-1)

300

706

Figure : (a) XRD pattern (b) Absorption spectra (c) XPS Survey scan (d) Raman spectra

of undoped and 1%, 2%, 5% and 10% Co doped ZnO

References:

1. D.Y. Inamdar, A.D. Lad, A.K. Pathak, I. Dubenko, N. Ali, and S. Mahamuni, J. Phys. Chem. C 114,

1451 (2010).

2. S. Doke, K. Sonawane, A. Banerjee, and S. Mahamuni, J. Alloys Compd. 726, 947 (2017).


Computational Study on Corrosion Inhibitor Molecules on Copper Surface

Shivani Tiwari 1;2

, Namrata Jaykhedkar 1;2

, Vaishali Shah1 and Sailaja Krishnamurty

2

1Interdisciplinary School of Scienti_c Computing, Savitribai Phule Pune University, Pune, India,

411007 2Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune-411008

Abstract The corrosion of metals and their alloys is a serious issue that affects many industries due to material

degradation, loss, failure of metal parts and equipment. One of the ways to prevent or reduce rate of

corrosion is use of inhibitors to form a protective layer on the metal surface. Copper is a commonly

used metal with excellent thermal and electrical properties with many industrial applications. In our

study we have selected commonly used industrial inhibitors namely, Benzotriazole (BTAH),

Imidazole (IM) and Indazole-5-Amine (AIA) for studying their adsorption mechanism on Cu (100)

and Cu (111) surfaces using first principles density theory calculations. We find that the top site is

preferred for adsorption of the three molecules under study. We find that AIA shows better adsorption

energy (-2.907eV) than IM (-1.456eV) for Cu (100) surface indicating that AIA will lead to better

corrosion inhibition of Cu-surfaces.

Figure 1: Adsorption of Imidazole on Cu (100) surface is shown in the left side and of Indazole-5-

Amine on right side of the figure. The brown, yellow, gray and blue coloured atoms represent Copper,

Carbon, Nitrogen and Hydrogen respectively.


Flexible PEDOT:PSS based 3 x 3 Active Matrix for Electrochromic Display

Applications

Shreya Patila,b#

, Mrudul Modaka,b

, and Arul Kashmir A a*

aCentre for Material for Electronics Technology (C-MET), Panchwati, Off Pashan Road,Pune 411005,

bDepartment of Physics Modern College of Arts,Science & Commerce, Shivajinagar,

Pune 411005

Abstract Semiconducting polymers are ideal materials for flexible electronics due to their advantageous

electrical and mechanical properties, solution processability with desirable stability. Herein, we

report fully printed, flexible PEDOT:PSS based active matrix electrochromic displays fabrication and

functioning at low applied bias (<5V). PEDOT:PSS (poly(3,4-ethylenedioxythiophene) :poly

(styrene sulfonate)) become a standard material in thin film electronic fabrication due to its

advantages of high electrical conductivity, transparency, and easy processability. In electrochromic

device, the chromic polymer will be sandwiched between the electrodes with sufficient electrolytes.

Upon applying the potential, the chemical reaction in electrochromic materials triggers and it switches

into its oxidized and reduced counterparts. The PEDOT:PSS backplane we fabricated has shown a

high electrical performance with good uniformity in pixel switching upon applied voltages

corresponds to the oxidation (+1.4 V) and reduction (-0.6 V) reversibly. Further, we deployed to

use the Arduino circuits to develop the displays with 3 x 3 active matrix to display the letter “T, C, L,

and O’’. We have characterized the electrochemical properties of the devices using CV(cyclic

voltammerty) , EIS(electrochemical impedance spectroscopy) which shows good switching

characteristics, facile manufacturing, and moderate stability. Overall, the fully printed electrochromic

display is promising for the large-area and low-cost flexible smart electronics applications.

0 V



-0.6 V

1.2 V

0 V

0.6 V


Synthesis of Copper Chromium Oxides (Cu-Cr-O) using thermal plasma

route for propellant application

S.S. Puranika,b

, V. L. Matheb S. V. Bhoraskar

b and S. B. Rane

a

aCentre for Materials for Electronics Technology,Panchawati, Off Pashan Road

Pune 411 008 bDepartment of Physics, Savitribai Phule Pune University, Pune 411 007

Abstract

Solid rocket propellants (SRP) are the crucial part of propulsion systems. Burn rate modifiers (BRM)

are the materials which are used to increase or decrease the rate of decomposition of an oxidizer in

SRP. Typical burn rate modifiers are metal oxides. Copper Chromium Oxide (Cu-Cr-O) is proven to

be good BRM material, which helps in achieving better performance of oxidizer. Herein, we use DC

thermal plasma route for the synthesis of copper chromium oxide. The Copper and Chromium fine

powders are subjected to plasma processing in the oxygen environment. The product so obtained was

characterized with XRD,TGA-DSC and RAMAN spectroscopy. XRD analysis shows that the

prominent peaks belong to the CuCrO2 phase (JCPDS 74-0983) along with few unidentified peaks. It

is important to note that, CuCr2O4 is the phase well discussed for burn rate modifier application. TGA

analysis shows approximately 21% weight gain when heated up to 1300° in an oxygen environment.

DSC analysis shows multiple endotherms which attributes to melting or a thermal decomposition of

the material. The peaks in the RAMAN spectra did not match with copper or chromium oxide when

compared with some data available in the literature. In conclusion, the synthesis of copper chromium

oxide led to the formation of CuCrO2 phase, although the desirable phase is CuCr2O4. Further efforts

to provide more oxygen in the synthesis may lead to formation of expected phase. The 21% weight

gain in TGA in the oxygen environment when heated up to 1300°C shows that the material is still

undergoing oxidation. Post TGA analysis of residue may show the formation of CuCr2O4.

Figure(a) XRD of Cu-Cr-O Figure(b) RAMAN spectra of Cu-Cr-O


Figure(c) TGA, 1st

derivative curve of TGA Figure(d)DSC curve of Cu-Cr-O

and normalized weight gain of Cu-Cr-O

Keywords: Solid rocket propellant, Burn rate modifier, Copper chromium oxide, Thermal

plasma



Acknowledgement: Authors would like to acknowledge Head, Department of Physics,

Savitribai Phule Pune University for the use plasma reactor systems at plasma nano materials

laboratory.

References:

1. Peng Zhang et al 2013 Nanotechnology 24 345704 (2013)

2. J. Venkata Viswanath, P. Vijayadarshan, T. Mohan, N.V. Srinivasa Rao,Amarnath Gupta & A.

Venkataraman Journal of Energetic Materials (2017)

3. A.P. Sanoop et al. / Thermochimica Acta 606 34–40 (2015)

4. A. Eslami et al. / Materials Chemistry and Physics 181 12e20 (2016)

5. Shalini Chaturvedi and Pragnesh N. Dave Journal of Experimental Nanoscience Vol. 7, No. 2, March–April,

205–231 (2012)


A Density Functional Study of Covalent Functionalisation of the metalliods

on the Electronic Transport Properties of the Graphene.

Siddharth S. Karkhanis1#

, Swapnil S. Deshpande1, Mrinalini D. Deshpande

1*

1Department of Physics, HPT Arts & RYK Science College, Nashik-05 , Maharashtra, India.

Abstract

From the last two decades, the various areas related to the sensor based technology are expanding at a

accelerated rate in terms of the applications as well as the development. Hence, as a consequence the

demand of nano-scale, highly sensitive, efficient as well as robust sensors is at a peak. Graphene

based sensors have been already reported to be the potential candidates in the diverse fields of

electronics, bio-sensing, molecular medicines as well as bioelectronics[1,2]. These sensors are of

particular interest because of the band gap tuning upon substitutional doping, enhanced mobility,

mechanical strength, high surface to volume ratio and fast electron transfer rate. One of the

deterministic aspect of the sensor’s efficacy during the device fabrication is the variations in the

conductive (I-V characteristics) properties. Current work focuses the implementation of the Density

Functional Theory (DFT) along with the Equilibrium Transport Theory. The first principles

calculations are carried out using the SIESTA code in which a basis set of localized atomic orbitals is

used. The structural and electronic properties of the pristine graphene as well as metalliods (B, Si, Ge,

As, Sb and Te) doped graphene sheets are studied within SIESTA. Results revealed the practical

applicability of such dopant materials in terms of the formation energies, band structure, density of

states (DOS) and charge density. The I-V characteristics of these optimized geometries are analyzed

using the GOLLUM code[3] having the ability to compute the charge and spin transport properties of

multi-terminal junctions. The current variations are in accordance with reported sensing type I-V

characteristics using various dopants[4]. This describes the potential ability of these metalloid

functionalized graphene in the device fabrication.

Figure: Schematic representation of the Transport Setup of Pristine Graphene monolayer.

Keywords: Doping, Sensors, SIESTA ,GOLLUM, I-V Characteristics.

#:Presenting author:[email protected] *:Corresponding author:[email protected]

Acknowledgment: All the authors would like to acknowledge the infrastructural and

computing facilities provided by the H.P.T. Arts & R.Y.K. Science College, Nashik-05.

References:

1. S. Z. Butler et. al., ACS Nano., 7, 2898 - 2926, 2013.

2. K. Z. Milowska. et. al. , J. Phys. Chem. C., 118, 17395 - 17401, 2014.

3. J. Ferrer et. al., New J. Phys., 16, 1367 - 2630, 2014.

4. N. M. Sabah et. al., IJAERS., 3, 154 - 156, 2016.


Facile fabrication of TiO2/g-C3N4 composite photocatalyst with enhanced

photocatalytic dye degradation

Smita Yadava#

and S.D.Sartalea,b*

a,bThin Films and Nanomaterials Laboratory, Department of Physics,

Savitribai Phule Pune University, Pune, India-411007.

Abstract

In our present work, TiO2/g-C3N4 composites were successfully prepared by hydrothermal method. In

these composites, the TiO2 contents were varied as 2.5% TiO2-C3N4, 5% TiO2-C3N4 , 7.5% TiO2-

C3N4, 10% TiO2-C3N4. All the composites were characterized by X - ray powder diffraction, UV- vis

diffusion reflection spectroscopy, photoluminescence etc. The said composites were further studied

for photo degradation performance of rhodamine B (RhB) under UV- vis light irradiation. Compared

with the pure phase of TiO2 and C3N4, the photocatalytic capability of composites, shows remarkable

efficiency due to heterojunction formation between g-C3N4 with TiO2, which plays a vital role in

enhancing the effective separation of photo induced electron- hole pairs and the expansion of an

optical absorption edge. It becomes a promising application for pollutant degradation.

Keywords: g-C3N4, TiO2, dye degradation, photocatalysis.




Hydrothermal synthesis and characterization of MoSe2 nanosheets

Sonal Pandit1, Rajnigandha Salunke

1, Prashant M. Kakade

1, Avinash R. Kachere

1,

Sachin R. Rondiya2, Bharat B. Kale

3, Adinath M. Funde

2, Sandesh R. Jadkar

3,

Nandkumar T. Mandlik1*


Maharashtra, India. 2School of Energy Studies, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007, India




Abstract From recent studies and research it is proved that TMDC's (transition metal dichalcogenides) have the

better properties with different type of applications in different areas. In present work we report

synthesis and characterisations of MoSe2 by using a simple hydrothermal method. Crystalline

structure and morphology of the samples were studied by X-ray diffraction measurements, Raman

spectroscopy, and field emission scanning electron microscopy. Formations of MoSe2 were confirmed

by XRD and Raman data. The nanosheet morphology of prepared MoSe2 sample is confirms by

FESEM results. The optical properties were investigated by UV−visible spectroscopy resulted the

bandgap value 1.56 eV. Current report provides simple and efficient technique for MoSe2 nanosheets.

Keywords: Molybdenum diselenide (MoSe2), Nanosheets.


Preparation and characterization of CdTe thin films

Sparsha S Sawant Dessai, Gauri A Jathar, Neha N Naik, Azul Savita, Mayuresh P Naik

Government college of Arts, Science and Commerce Quepem-Goa. 403705


Abstract

CdTe thin film was electrodeposited at room temperature from an aqueous solution containing

cadmium sulphate (CdSO4) and sodium tellurite (IV) as precursor salt with ethylenediamine tetracetic

acid (EDTA) as complexing agent in double distilled water. Electrodeposition of 0.1M cadmium

telluride thin film was carried out on a stainless steel substrate. Deposition potential was determined

using cyclic voltatommetry.The electrodeposited thin films were characterized by X-RAY diffraction

(XRD) for their structural studies IR spectra was recorded using FTIR spectrophotometer. Band gap

energy of CdTe thin film was calculated using UV- VIS spectra.


Amino substituted Lawsone derivatives as photosensitizers for Dye

Sensitized Solar Cells

Suprabha S. Sahoo a,b

, Habib M. Pathanb, Sunita Salunke-Gawali*

a

aDepartment of Chemistry, Savitribai Phule Pune University, Pune 411007, India bDepartment of Physics, Savitribai Phule Pune University, Pune 411007, India

Abstract Application of renewable energy sources to meet future energy demand having no environmental peril

is the biggest confront of this twenty first century. Solar energy being a potential candidate is used in

various forms and specifically in dye sensitised solar cells (DSSCs) are under extensive investigation.

Thus a genuine research for the quest of metal free organic dyes having amino substituted 1,4-

naphthoquinone framework is the core area of research here. 2-hydroxy-1,4-

naphthoquinone(Lawsone) a major coloured imparting ingredient of naphthoquinone family is

intensively studied as a photosensitizer in DSSC industry but 1,4-naphthoquinone derivatives after

reaction with aminophenol possessing benzo[α]phenoxazine skeleton which is less explored are

invasively studied and engineered here to bring a panoramic change in the field of dyes in DSSC.

Various aminophenols are reacted with Lawsone; to give benzo[α] phenoxazines which sensitizes the

semiconducting metal oxide TiO2 used as a photoanode. The HOMO and LUMO energy levels of

compounds 10-chloro-5H-benzo[α]phenoxazin-5-one, 10-methyl -5H-benzo[a]phenoxazin-5-one are

well placed with the conduction band of titanium dioxides and workfunction of Iodine/Triiodide as an

electrolyte. Double bond extended conjugation; favourable π–π interaction and planner shape of the

molecules help the dyes to show better absorption of solar spectrum in visible to near IR region as

well as good electron percolation to functionalize the cell. The device was fabricated with the

aforesaid dyes with nano-structured TiO2 photo anode prepared by doctor blade method which was

sintered at 450° C for one hour. The efficiency of the device was studied with varying concentration

of the dye, time of dye loading and changing reductive shuttles. Characterization of the film by UV-

Visible, FT-IR spectroscopy, CyclicVoltammetry, SEM, X-ray diffraction studies has been done.

Key words: TiO2, Naphthoquinone, Benzo[α]phenoxazine, Cyclic Voltammetry, DSSC.




Sustained multiferroicity in liquid crystal induced by core/shell quantum

dots

Swapnil Doke,1,#

Prasun Ganguly,2,* and Shailaja Mahamuni

1,*

1Department of Physics, S. P. Pune University, Pune 411 007, India

2Department of Physics, Faculty of Sciences, National Defence Academy, Khadakwasla, Pune 411

023, India

Abstract

Co-ZnO/ZnO core/shell (CZZ) quantum dots (QDs) dispersed in ferroelectric liquid crystal (FLC)

reveal improved spontaneous polarization in addition to ferromagnetic ordering. A suitable

concentration of diluted magnetic semiconductor core/shell QDs was added into pure FLC (KCFLC

7S) material to study its ferroelectric and ferromagnetic properties. Increased cobalt concentration in

the core of CZZ QDs enhances the magnitude of saturation magnetization. The inherent magnetic

field of core/shell QDs coupled with the director field of the FLC molecules without interfering

intrinsic properties of host FLC and dopant QDs. Remarkably, optimized concentration of QDs does

not disturb intrinsic ferroelectric nature of the host as confirmed by ferroelectric and helical pitch

measurements. This work should be helpful for future liquid crystal display systems based on QDs,

which exhibit both electric and magnetic memory within itself.

Figures

-10 -5 0 5 10

-30

-20

-10

0

10

20

30

0 2 4 6 8 1018

20

22

24

26

28

Ps (

nC

/cm

2)

Conc. of Co in core (%)

Ps

Pure FLC

Po

lari

za

tio

n (

nC

/cm

2)

Electric Field (kV/cm)

Pure FLC

CZZ-0/FLC

CZZ-2/FLC

CZZ-5/FLC

CZZ-10/FLC

Fig. 1. P-E hysteresis loop

-4000 -2000 0 2000 4000

-1.0

-0.5

0.0

0.5

1.0

-20 -10 0 10 20-0.010

-0.005

0.000

0.005

0.010

Mag

neti

zati

on

, M

(m

em

u/g

)

Applied Magnetic Field, H (Oe)

Pure FLC

CZZ-0/FLC

CZZ-2/FLC

CZZ-5/FLC

CZZ-10/FLC

Fig. 2. M-H hysteresis loop

References

[1] F. Brochard and P.G. de Gennes, J. Phys. 31, 691 (1970).

[2] T. Joshi, A. Kumar, J. Prakash, and A.M. Biradar, Appl. Phys. Lett. 96, 253109 (2010).

[3] B. Rožič, M. Jagodič, S. Gyergyek, M. Drofenik, S. Kralj, Z. Jagličić, and Z. Kutnjak,

Ferroelectrics 431, 150 (2012).

[4] P. Ganguly, A. Kumar, K. Muralidhar, and A.M. Biradar, Appl. Phys. Lett. 108, 182905 (2016).

[5] S. Doke, K. Sonawane, V. Reddy, P. Ganguly, and S. Mahamuni, Liq. Cryst. 45, 1518 (2018).

# Presenting Author: [email protected]

* Author for Correspondence: [email protected], [email protected]


Visible light induced BiVO4 photocatalyst for MB dye degradation

Swati S. Gagare1, Akansha R. Pawar

1, Ruchira Madhe

1, S. I. Patil

2, S. S.Kekade

1*

1Radhabai Kale Mahila Mahavidyalaya, Ahmednagar, 414001

2Department of Physics, Savitribai Phule Pune University, Pune, 411007

Abstract Using the ceramic method, we synthesize the monoclinic BiVO4 photocatalyst for visible light

Photocatalyst. The samples were sintered at 6000C for monoclinic phase formation. The structural

monoclinic phase was confirmed using X-ray diffraction study. The grain size was calculated using

Debye Scherrer equation. The UV-visible data confirm that the monoclinic sample having band gap

in visible range. The characterization of BiVO4 samples was also carried out by using scanning

electron microscopy (SEM). The photocatalytic activities of BiVO4 samples were confirm by the

methylene Blue degradation under the visible light irradiation. The monoclinic BiVO4 shows the

excellent photocatalytic activity than that of tetragonal BiVO4.

Figure : UV Vis adsorption spectra of MB BiVO4 solution on under visible light irradiation.

Keywords: Bismuth Vanadate, Photocatalyst, Photodegradation, Solid state reaction route.


Acknowledgement: The author is thankful to Department of Physics SPPU, Pune for

experimental support. The author also thank full to Radhabai Kale Mahila Mahavidyala,

Ahmednagar for encouragement and support.

References:

1. Y. Park, K. J. McDonald and K-S Choi, Chem. Soc. Rev. 42, 2321, (2013)

2. A.Kudo, K. Omori, H. Kato,J.Am. Chem. Soc. 121, 11459, (1999)


Study of structural, electronic and magnetic properties of (Ni2O3)n cluster

T.L.Kumavat , Dr. D. L. Lalsare

Department of Physics, H. P. T. Arts & R. Y. K. Science College, Vidyanagar, College Road, Nashik,

422005

Abstract

Ni2O3 has a wide range of applications in the field of battery, ceramic industry and it can be used as

catalyst for various reactions. It is also used in the field of Spintronics, DMS (Dilute Magnetic

Semiconductor) and in storage devices such as Supercapacitor and MRAM. Ni2O3 have high

absorption capacity of toxic metals in nanodimensions and hence can be used for removal of heavy

metals like Cr from water. Density functional theory (DFT) is a quantum mechanical modeling tool

which is used to study the Structural, electronic and magnetic properties of (Ni2O3)n clusters with n=1

to 5 .The DFT calculations were performed using VASP simulation package. Small size Ni2O3

clusters exhibits drastically different properties than that of bulk counterpart due to difference in size.

We have investigated the size dependance of structural, electronic and magnetic properties of these

clusters. The overall stability of cluster increases with number of unit was also studied. The results are

shown by different cluster geometries, total and spin charge density plots, density of states (DOS)

plots and partial charge density plots, spin gap and binding energy plot, Homo-Lumo gap, vertical

detachment energy and Ionization potential plots.

Keywords : DFT, Ni2O3 Clusters

#: Presenting author : [email protected]

References :

1. Sayan Dey, Swarupananda Bhattacharjee, Mahua Ghosh Chaudhari ; Royal Society of

Chemistry, Issue 67 , 54717-54726 ,(2015)

2. Dan Liu, Dongsheng Li, Deren Yang; AIP Advances, Volume 7, Issue 1, (2017)

3. Max C. Holthausen, Wolfram Koch; A Chemist’s Guide to Density Functional Theory


Preparation and characterization of CdSe thin films

Tanvi T Naik, Sanisha S Fal Dessai, Rutuja N Sawant Dessai, Shruti G Sanvordekar,

Riyanka Gawas

Government college of Arts, Science and Commerce

Quepem-Goa. 403705


Abstract

CdSe thin film was electrodeposited at room temperature from an aqueous solution containing

cadmium sulphate (CdSO4) and selenium dioxide (SeO2) as precursor salt with ethylenediamine

tetracetic acid (EDTA) as complexing agent in double distilled water. Electrodeposition of 0.1M

cadmium selenide thin film was carried out on a stainless steel substrate. Deposition potential was

determined using cyclic voltatommetry.The electrodeposited thin films were characterized by X-RAY

diffraction (XRD) for their structural studies, IR spectra was recorded using FTIR spectrophotometer.

Band gap energy of CdSe thin film was calculated using UV- VIS spectra.


Synthesis and characterization of NiO nanoparticles by Microwave

irradiation technique

V. B. Shinde a, S. B. Bajaj

a*

aDept. of Physics, JES college, Jalna, 431203

Abstract

Transition metal oxides like Nickel oxide (NiO) exhibit semi-conducting properties that get enhanced

at the nanoscale. NiO nanoparticles have unique optical & magnetic properties. In the present work

we have synthesized NiO nanoparticles by using novel technique of Microwave Heating of molecular

precursors. Due to efficient internal heating, this technique utilizes less energy and yet can produce

higher yields of uniform size nano-particles in very short period of time. The as-prepared

nanoparticles have been characterized by XRD & SEM. The XRD results show the formation of NiO

phase with an average size of about 38nm. The SEM results show the formation of Flower shaped

structure of NiO nanoparticles.

Figure: XRD pattern of NiO nanoparticles

Keywords: NiO nano particles, Microwave Irradiation method,



Acknowledgement: The author V. B. Shinde is thankful to JES Jalna and dept of Physics,

SPPU, Pune for different measurements.

References:

1. G. Anandha Babu, G. Ravi, T. Mahalingam, M. Kumaresavanjj and Y. Hayakawa, Dalton Trans, 44,

4485-4497 (2015)

2. R. A. Raj, M. S. Alsalhi and S. Devanesan, Materials, 10 (5), 460 (2017)


Tidal evolution of close-in exoplanets

Venkat Punjabia#

and Dr. Mauro Barbieria

aINCT, Universidad de Atacama, Copayapu 485, Copiapo 1530000, Chile

Abstract The tides raised on a planet by the host star can result in the decay of the orbits of such planets.

Distribution of orbits of such exoplanets show removal and destruction due to this phenomenon. This

is in agreement with theoretical prediction of tidal interaction of close-in exoplanets with their host

stars. Planets with extremely small values of semi-major axis may be experiencing destruction due to

tides raised by star on the planet. Also, small eccentricities of planets with smaller semi-major axis ( a

< 0.2 AU ) is attributed to damping by tides. In this study, we present preliminary results on tidal

evolution of close-in exoplanets.

Figure: Eccentricity –Period Distribution of extra-solar planets

Keywords: Exoplanets, Tidal Evolution, Star-Planet interaction



References:

1. Hurley, J. R. Et al. (2001, October 11). Evolution of binary stars and the effect of tides on binary

populations.

2. Southworth J. (2014, November 05). The DEBCat detached eclipsing binary catalogue.

3. Eker Z. et al. (2014, March 06). The Catalogue of Stellar Parameters from the Detached Double-Lined

Eclipsing Binaries in the Milky Way.

4. Chen et al. (2017, May). VizieR Online Data Catalog: Mass & radius of planets, moons, low mass

stars.

5. Guillot T. (2005, May 19). THE INTERIORS OF GIANT PLANETS: Models and Outstanding

Questions.

6. Helled R. (2019, June). The Interiors of Jupiter and Saturn.

7. Zeng L. et al. (2017, March 10). A Simple Analytical Model for Rocky Planet Interiors.

8. Celebonovic V. (1983, July 19) . A Model of Neptune According to the Savic-Kasanin Theory.

9. Rao S. et al. (2018, July 05). Star-planet interactions V. Dynamical and equilibrium tides in convective

zones.

Pla


Synthesis of copper nanoparticles for the inclusion phenomenon with

bovine serum albumin and calixarene molecule

Vijay Karbhari Ahire, Dr. Deepali D. Malkhede

Department of Chemistry, Savitribai Phule Pune University, Pune 411007.

Abstract

Copper nanoparticles are synthesized from chemical reduction method are used for the complexation

with bovine serum albumin and calixarene molecules. In this study we have used the colloidal

solution of copper nanoparticles are for the inclusion complexation purpose with bovine serum

albumin and calixarene molecules. This study can be done by spectroscopic studies where

fluorescence data gives the binding constant on the order of 104 mol / dm

3. The formation of the

copper nanoparticles and bovine serum albumin and calixarene complexes also confirmed from the

circular dichroism techniques. Another technique is used for the particle size determination. The

dynamic light scattering technique is used for the particle size analysis of the copper nanoparticles.

From the TEM analysis we are getting 50 nm sized nanoparticles. And from the DLS we are getting

aggregates formation of the nanoparticles.

Figure: TEM image of copper nanoparticles

DLS analysis of the nanoparticles and the BSA and calixarene

Sr. No. Sample ID

Effective

Diameter (nm)

Poly dispersity Baseline Index

1. BSA pure

Mean:

Std Err:

Std Dev

14,83,767

14,62,216

25,32,633

0.425

0.408

0.115

0

0

0

2. Copper

nanoparticles

Calix , BSA

Mean:

Std Err:

Std Dev

21,261.33

20,442.23

35,406.98

0.515

0.076

0.132

0

0

0


References

1. A. Bhogale, N. Patel, J. Mariam, P.M. Dongre, A. Miotello, D. C. Kothari, " Comprehensive

studies on the interaction of copper nanoparticles with bovine serum albumin using various

spectroscopies". Colloids and Surfaces B: Biointerfaces, 2014, 113 276-284.

2. Mukaddes Keskinates, Bahar Yilmaz,Yakup Ulusu, Mevlut Bayrakci, Electrospinning of

novel calixarene-functionalized PAN and PMMA nanofibers: Comparison of fluorescent

protein adsorption performance, Material Chemistry and Physics, 2018, 205, 522-529.

3. Ping Fan, Lu Wan et.al "Spectroscopic investigation of the interaction of water-soluble

azocalix[4]arene with bovine serum albumin", Bioorganic chemistry Els. 2015, 58, 88-95.

4. Dong, X., Jiang, D., Liu, Q., Han, E., Zhang, X., Guan, X., Wang, K. & Qiu, B.

(2014).Enhanced ampere metric sensing for direct detection of nitenpyram via synergistic

effect of copper nanoparticles and nitrogen-doped graphene, Journal of Electro analytical

Chemistry 734, 25-30.


Establishment of the Hanbury Brown – Twiss and Mach - Zehnder

Interferometers and Measuring Ultra - low Power of Pulsed Laser Beam

Viraj Gujara,1

aFergusson College, Pune - 411004,

Nano Science Laboratory, Materials Science Section, 1Raja Ramanna Centre for Advanced Technology, Indore-452013.

Abstract

It is given that for any electronic circuitry to tweak the photons, the necessary time gap that is

needed between photons is approximately 4 ns. The idea behind using a pulsed laser beam as a single

photon source relies on the characteristics of the laser. The laser to be used in this project is the

Tsunami, a mode locked Ti:Sapphire laser. The specifications of this laser indicate that it produces an

output pulse every 12.2 ns, when being operated at a frequency of 82 MHz. Since this time gap is

sufficiently more than enough for electronics to respond effectively, we can change the properties of

the photons, such as its polarization. Moreover, the pulse width of the laser beam can be brought

down to as low as a few hundreds of femtoseconds. What this means is that we can know the arrival

time of the pulse of photons precisely. Thus, the effective time gap between the pulses and their

precise arrival time are very important features in using the pulsed laser beam as a single photon

source. The intention behind this is that the laser beam must be attenuated to such a low power that it

must be confined to one photon per pulse. However, before beginning to apply this treatment to the

pulsed laser beam straight away, it is sensible to start off this treatment on a continuous wave laser,

use the analogy of a pulsed laser beam to this continuous wave laser, and then finally use the pulsed

laser itself. The most important step in reaching the single photon level is to design a setup, which is

sophisticated enough to be insensitive or insusceptible to any other photon sources in the lab. Besides,

working in a lab with high power lasers being used in many other setups is also gruelling task. The

use of photodetectors which can measure such low powers requires the setup to be highly stable and

isolated from its surroundings. This is because these photodetectors operate at such low damage

thresholds that even normal lighting conditions can saturate them or even go as far as to damaging

them. Thus, special care and precautions need to be taken for sensing such low powers. To begin with

this process, the large area photodiodes were used. These are the most commonly used photodiodes

but are not sensitive enough to detect powers below µW. Hence the noise level of this photodiode was

measured in the setup in the absence of any source and once the noise level was identified, the source

was detected with the help of these photodiodes by attenuating it to power which was roughly twice

the noise equivalent power. In the next step, the femtowatt photoreceivers (Model No - PDF10A)

were used. The advantage of this photoreceiver is that it has got a high damage threshold value of

10mW. Hence, using them even in normal lighting conditions would saturate the device, but not

damage it. Again, the noise level for these photoreceivers was identified and the laser beam was

attenuated to powers which were about twice that of the noise level.

Figure: The calibration graphs of the Femtowatt Photoreceivers (PDF10A)


Conclusion

The minimum power that was sensed was 13 pW, which corresponds to 0.5 photons per

pulse. The verification of arrival of a single photon per pulse can be done with the Single Photon

Counting Module (SPCM20A). This implies that the setup is stable enough to reach levels that give

less than a photon per pulse.

1: Presenting author: [email protected]

Acknowledgement

I express my deepest gratitude to Dr. J. Jayabalan, whose presence and supervision

was pivotal in carrying out this project at the Nano Science Lab, Materials Science Section at

the Raja Ramanna Centre for Advanced Technology, Indore.

References

[1] Pathak, A. (2013). Elements of Quantum Computation and Quantum Communication. CRC Press.

[2] Brown, R. H., & Twiss, R. Q. (1956). A Test of a New Type of Stellar Interferometer on Sirius. Nature.

[3] Scully, M. O., & Zubairy, M. S. (1997). Quantum Optics. Cambridge University Press.

[4] Zetie, K. P., Adams, S. F., & Tocknell, R. M. (January 2000). How does a Mach–Zehnder

interferometer work? Phys. Educ. 35(1) , 1-3.

[5] Holbrow, C. H., Galvez, E., & Parks, M. E. (2001). Photon quantum mechanics and beam splitters.

American Association of Physics Teachers .

[6] Beveratos, A., Brouri, R., Gacoin, T., Villing, A., Poizat, J.-P., & Grangier, P. (2002). Single photon

quantum cryptography. Phys. Rev. Lett. , 89 (187901).

[7] Ying, M. (2010). Quantum computation, quantum theory and AI. Science Direct, Elsevier , 174 (2).

https://books.google.co.in/books/about/Elements_of_Quantum_Computation_and_Quan.html?id=cEPSBQAAQBAJ&printsec=frontcover&source=kp_read_button&redir_esc=y#v=onepage&q&f=false

https://www.nature.com/articles/1781046a0

https://www.cambridge.org/core/books/quantum-optics/08DC53888452CBC6CDC0FD8A1A1A4DD7

https://www.cs.princeton.edu/courses/archive/fall06/cos576/papers/zetie_et_al_mach_zehnder00.pdf

https://www.cs.princeton.edu/courses/archive/fall06/cos576/papers/zetie_et_al_mach_zehnder00.pdf

http://departments.colgate.edu/physics/research/Photon/root/ajpbs02.pdf

http://departments.colgate.edu/physics/research/Photon/root/ajpbs02.pdf

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.187901

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.187901


Study of Electrical Properties of Graphitic Carbon Nitride using Low

Energy Ion Irradiation Technique

Yogeshri G. Bagekaria*

, Akash P. Jadhavb, Ashish B. Thorat

b, Ashish P. Yengantiwar

a,

Vasant N. Bhoraskarb, Sanjay D. Dhole

b, Shailendra S. Dahiwale

b

aDepartment of Physics, Fergusson College, (Autonomous), Pune, Maharashtra 411004

bMicrotron Accelerator Laboratory, Department of Physics, Savitribai Phule Pune University, Pune,

Maharashtra 411007 *Presenting author:[email protected]

Abstract Ion irradiation is useful tool for experimentally stimulating a controlled modification of structural and

electrical properties of new generation 2D nanomaterials. The current work presents the results on

effect of nitrogen and oxygen ion irradiation on structural and conducting properties of graphitic

carbon nitride (g-C3N4). The g-C3N4 was synthesized by direct heating of melamine powder (C3H6N6)

in a tubular furnace with controlled nitrogen environment. Synthesized g-C3N4 powder was further

characterized by X-ray diffraction spectroscopy (XRD), UV-visible (UV–vis) spectroscopy and

scanning electron microscopy (SEM) techniques, results were in consistent with the existing

literature. Synthesized powder (g-C3N4) was deposited in a thin film form on glass substrates using

spin coating technique. As deposited thin films were then respectively irradiated for different ion

fluence of ~ 9x1016

, 2x1017

and 4x1017

ions cm-2

with nitrogen and oxygen ions at constant

energy of 30 keV. Two probe I-V measurements show the remarkable increase in the conductivity of

g-C3N4 before and after irradiation for both nitrogen and oxygen ion. When compared oxygen

irradiation with nitrogen, oxygen irradiated samples shows an order of magnitude more conductivity

than nitrogen irradiation samples. The above results confirm the irradiation induced modification in

the g-C3N4 samples. The reason for increase in the conductivity may be due to the doping of oxygen

or nitrogen in the g-C3N4 matrix. Further study of doped g-C3N4 samples is under progress.

References:

1. Fangyan Wei et al. Nanoscale, 10, 4515 (2018).

2. Jamshaid Rashid et al., Scientific Reports, 9,10202 (2019).

Figure: I-V characteristics of Nitrogen and Oxygen ion irradiated g-C3N4.


Direct Synthesis of polymer: matal sulphide nanocomposite at different

reaction temperature to study optical properties for photovoltaic

application

Yogita N. Chaudhari, Prof. J. V. Sali*


Abstract The SnS nanocrystals were synthesized directly in polymer matrix at different reaction temperature.

The UV spectra show that the reaction temperature influences the optical properties of nanocrystals.

Also FTIR spectra reveal the bonding between SnS nanocrystals and the polymer matrix via dipole-

dipole interaction.


Acknowledgement: Y.N. Chaudhari acknowledges the support by the Department of

Physics, SOPS, KBC NMU, Jalgaon.


Preparation of MWCNT-Pth-Ru/Pd Nano composite at Liquid-Liquid

Interface Reaction Technique

Zahid S. Momina#

and Prof. Dipalee D. Malkhedea*

aDepartment of Chemistry, Ganeshkhind road, Savitribai Phule Pune University , 411007

Abstract In this work, attempt was made to develop a fundamental understanding of the supercapacitor

response of MWCNT-PTh thin film composite embedded with the Ru and Pd metals. Synthesis

method used was LLIRT (Liquid-liquid Interface reaction technique) to grow thin film at two

immiscible liquid’s interface[1]. Morphological characterization of as-prepared electrode samples

revealed layer by layer deposition with embedment of the Ru/Pd within the MWCNT-Pth layer

provides a good electronic and mechanical connection between the active materials (MWCNT-Ru/Pd)

and current collector (Polythiophene)[2]. This improves the mechanical strength, stability and

electronic conductivity of the system. In electrochemical characterization cyclic voltammogram

comparisons was studied at different scan rates of 10, 20, 50 and 100 mV/s within the potential range

of 0.3 to 0.8 V. CV of nanocomposite MWCNT-Pth-Ru/Pd showed rectangular peaks which is

characteristic of supercapacitor. Peak shape and rectangular peak area increased as scan rate was

increased which showed the good material for electrochemical supercapacitor.

Figure 1: a) CV response of ‘Pth(A), MWCNT-Pth (B), Ru/Pd (C) and MWCNT-PTh-

Ru/pd (D) composite in 0.5M H2SO4 solution at 100mV b) CV response of MWCNT-PTh-Ru/pd

composite at various scan rate in 0.5M H2SO4 solution c) Galvanostatic charge/discharge (GCD)

curves of composite in 0.5 M H2SO4 solution at 0.5 Ag-1

and d) few cycles of charge discharge profile

of MWCNT-PTh-Ru/pd composite.

Galvanostatic charge discharge study showed that MWCNT-Pth-Ru/Pd composite electrode

exhibited more excellent electrochemical properties. Further, the better symmetry indicated its

superior electrochemical behaviour. The prepared MWCNT-Pth-Ru/Pd composites composite

exhibited a high specific capacitance 85.4 F g-1

and areal capacitance of 854 F cm-2

at 0.7 mV s-1

,

suggesting a highly promising prospective for SCs. The facile method of synthesis can be readily

adapted to prepare other high-performance electrode materials containing MWCNT as a conducting

additive. These values are still comparable to other types of electrochemical capacitor systems.

Keywords: LLIRT, MWCNT, keywords for Paper


[email protected]

Acknowledgement: Dr. Babasaheb waghmode.

References:

1. Lewandowski, M. et al. On the structure of ultrathin FeO films on Ag(111). Nanomaterials (2018).


Hot Injection Synthesis of Cu2FeSnS4 (CFTS) Nanocrystal for Energy

Storage Application

Bharat Bade1,2

, Sachin Rondiya1,Pradnya Ahire

1, Mamta Nasane

1, Sagar Jathar

1, Sunil

Barma1, Kiran Kore

1, Pramod Tandale

1, Dhanraj Nilgave

1,Sandesh Jadkar

2 and

Adinath Funde 1a)

1School of Energy Studies, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007 2Department of Physics, Savitribai Phule Pune University, Ganeshkhind, Pune – 411007.

a)Corresponding author: +91 20 2569 5201, [email protected]

Abstract

The quaternary chalcopyrite semiconductors are being considered as an attractive class of materials

for optoelectronic devices, thin film solar cell and energy storage devices. In present study,

Cu2FeSnS4 (CFTS) nanocrystals have been synthesized by using hot injection method. The X-ray

diffraction (XRD) results shows confirms that the CFTS nanocrystal possessed pure tetragonal

structure with high crystallinity. The UV-Visible spectra reveal that the CFTS nanocrystal had broad

absorption band in the whole visible region with band gap of 1.53 eV. Scanning electron microscopy

(SEM) and energy dispersive X-ray spectroscopy (EDS) results showed that the crystallites were

largely agglomerated with variation in their size and the composition of synthesized products was

close to the stoichiometry of CFTS. As a anode material for the lithium ion batteries (LIBs), the as-

prepared CFTS nanocrystal shows both high reversible capacity and food cycling performance at

room temperature. The achieved initial discharge capacity is 710 mAhg-1

and retained at 495 mAhg-1

after 5 cycles. The performance of thr CFTS nanocrystal suggests that the Kesterite CFTS can be a

promising candidate as a anode material for battery application.

Figure : X-ray diffraction pattern of CFTS powder synthesized at 250°C

Keywords: hot injenction synthesis, Lithium-ion battery, Energy storage, Semiconductor

# Presenting author:[email protected]

*Corresponding Author:[email protected]

Referances :

1. Y. Liu,M. Hao, J.Yang, L. Jiang, C. Yan, C. Huang, D.Tang, F. Liu, Y.Liu, Materials Letters, 136, 306-309,

(2014)

2. Q. Jiang, X. Chen, H. Gao, C. Feng, Z. Guo, Electrochimica Acta 190, 703–712, (2016).

3.F. Ozel, M. Kus, A.Yar , E. Arkan, M. Can, A. Aljabour, N. M. Varal, M. Ersoz, J. Mater. Sci. 50:777–783

(2015)

https://www.sciencedirect.com/science/article/abs/pii/S0167577X14015407#!






Investigation of the Structural, Morphology and Magnetic properties of Ni

substituted Co-ferrite

Nikita B. Tathe, Bhavna C. Keswani, Abhijeet V. Dhotre, Yesh D. Kolekar

Department of Physics, Savitribai Phule Pune University, Pune-411007

Abstract

In the present work, the structural, morphology and magnetic properties of Ni substituted Cobalt

ferrite (CoFe2O4) were investigated. The Ni substituted CoFe2O4 with compositions Co1-xNixFe2O4 (x=

0.0, 0.1 & 0.2) were synthesized by standard solid state reaction method. X-ray diffraction (XRD)

analysis confirms the cubic spinel structure with space group Fd3m for all the compositions. The

lattice parameter decreases with Ni substitution in CoFe2O4 due to smaller ionic radii of Ni2+

compared to Co2+

. Also, the Raman spectra indicate the presence of all Raman modes corresponding

to the spinel ferrites. The scanning electron micrographs (SEM) show the polyhedral shaped grains

with dense microstructure. Further, it is observed that the grain size decreases with Ni substitution.

The magnetic properties are still under investigation.

Keywords: Cobalt ferrite, X-ray diffraction, Magnetization, etc.


Corresponding author: [email protected]/ [email protected]


Study of AC and DC Voltage Electrowetting on Ferroelectric Polymer for

Low Voltage Applications

Pranjali Yedewar#, Sandip Wadhai and Arun Banpurkar*

Department of Physics, Savitribai Phule Pune University, Pune 411007, India

Abstract We demonstrate ac and dc voltage electrowetting (EW) on bilayer dielectric. It consists of thick layer

of ferroelectric polymer, polyvinylidene fluoride-co-hexaflouropropylene (PVDF-HFP) and a

nanometer thin layer of hydrophobic Teflon AF over it. The ferroelectric layer increases the effective

dielectric constant of the bilayer geometry; however it introduces remnance polarization in the system

resulting in pinned EW response. The reverse voltage needed to unpin this state depends on the

magnitude of applied voltage. Also dc-voltage EW response is asymmetric, higher response is seen

for positive polarity to the droplet. This is likely to be attributed to the intrinsic charge trapping by

hydrophobic polymer layer upon exposure to the ambient air. The EW response for ac-voltage shows

distinct behavior, which varies with frequency of applied voltage. The maximum EW response is

observed for 1 kHz driving frequency. The study demonstrates that dc-voltage EW exhibits hysteretic

response in contact angle change. Ac-voltage shows highest response due to the maximum dielectric

constant of bilayer useful in low voltage ac EW application.

DC Voltage Electrowetting

AC Voltage Electrowetting

Figure 1: Graph of offset voltage (ΔV) versus

applied voltage (V) Figure 2: Graph of εeff/d versus frequency

Keywords: Electrowetting, remnant polarization, hysteresis etc.

# Presenting author: [email protected]

* Corresponding author: [email protected]

Acknowledgement: P.G.Y. and A.G.B. would like to acknowledge SERB, (DST), India

(EMR/2016/007060), for generous financial support.

References:

1. J. Lee, Y. Park, S.K. Chung, Sensors Actuators, A Physical, 287 (2019) 177–184.

2. F. Mugele, J. Heikenfeld, Wiley-VCH Verlag GmbH & Co., Weinheim, Germany, 2019, pp 133.

3. A.J. Edwards, C. V. Brown, M.I. Newton, G. McHale, Curr. Opin. Colloid Int. Science, 36 (2018) 28-36.

4. Y.B. Sawane, S.B. Ogale, A.G. Banpurkar, ACS Appl. Mater. Interfaces, 8 (2016) 24049−24056.

5. F. Mugele, J.C. Baret, J. Phys. Condens. Matter, 17 (2005) R705–R774.


MOF based ZnO Nanosheets for Photoelectrochemical Splitting of Water

Pratibha Shinde, Vidya Doiphode, Vidhika Sharma, Mohit Prasad and Sandesh

Jadkar*

Department of Physics, Savitribai Phule Pune University, Pune 411 007, India

*Corresponding author: E-mail: [email protected] Tele: + 91 020 2569 2678

Abstract

Metal oxides are considered as the most promising materials for photoelectrochemical (PEC) water

splitting application. Synthesis of ZnO photoanodes with high light harvesting efficiency is of great

importance for building PEC cells. The PEC properties of ZnO can be enhanced by modifying ZnO

by organic compounds like Metal Organic Frameworks (MOF). We have electrodeposited Zinc Oxide

Nanosheets (ZNS) on FTO substrate and then these films were modified by methylimidazole solution

using chemical bath deposition. Different concentrations of methylimidazole solution were taken to

modify the properties of the synthesized ZNS. Formation of ZNS and ZIF8 structure has been

confirmed by XRD, SEM and Raman. Optical properties were investigated using UV-Visible and

FTIR spectroscopy. Photoelectrochemical properties, Mott-Schottky analysis, Electrochemical

Impedance Spectroscopy (EIS) and photocurrent efficiency measurements were carried out for all the

synthesized photoanodes. The results obtained for 0.0812M concentration of MOF were best among

the different concentrations employed for the experiment. The ZNS/ZIF8 photoanode exhibited a

photocurrent density of 0.71 mA cm-2

at a bias of 1V (Vs Ag/AgCl) which was 5.07 times higher than

that of pristine ZNS. This works presents a promising pathway for fabricating MOF based

semiconductor composites for efficient photoanodes for photo-electrochemical splitting of water.

Zinc Oxide Nanosheets, Electrodeposition; PEC water splitting; Photoanode Keywords:

References:

1. Mohit Prasad, Vidhika Sharma, Sandesh Jadkar, Photoelectrochemical Cell: A Versatile Device

for Sustainable Hydrogen Production, Photoelectrochemical Solar Cells, Wiley, USA (2018): 59-

119.


Plasmon Sensitized Zinc Oxide Nanorods for Efficient


Sayed Abdul Saboor, Pratibha Shinde, Vidya Doiphode, Vidhika Sharma, Mohit

Prasad and Sandesh Jadkar*



Abstract

The influence of Au plasmons on ZnO nanorods (ZNRs) for photoelectrochemical splitting of water is

the main focus of the present experimental study. Plasmonic layer of Au is incorporated as top layer

on electrochemically deposited ZnO nanorods. Au modified nanostructures exhibited better optical

absorption as plasmonic layer stimulates charge transfer and restrain charge recombination. Zinc

oxide nanorods modified with Au (deposition duration ~45 s) had shown photocurrent density of ~600

µA cm-2

, at a bias of 1.0 V/SCE. Structure and surface morphology of the synthesized photoanodes

was studied using x-ray diffraction and scanning electron microscopy. Optical characterization was

done using energy-dispersive x-ray analysis, UV–Visible absorption spectroscopy and Raman

spectroscopy. The current–voltage characteristics, electrochemical impedance spectroscopy, Mott–

Schottky analysis, and photoconversion efficiency measurements have been used to substantiate our

observations of synthesized photoanodes.

Zinc Oxide Nanorods, Electrodeposition; PEC water splitting; Photoanode Keywords:

References:



119.


High k-dielectric Zirconia thin films by sol-gel technique for field effect

transistors

Tanuja Shindea#, Priyanka Londhe

b, Anjali Athawale

b and Nandu Chaure

a*

aDepartment of Physics, Savitribai Phule Pune University (formerly University of Pune), Pune-

411007, INDIA bDepartment of Chemistry, Savitribai Phule Pune University (formerly University of Pune), Pune-

411007, INDIA

Abstract To fulfill the demand of integrated circuits with greater performance and lower cost in the industry, it

needs amplification in chip density which appeals the scaling of device. For the said reason, scaling of

SiO2 acting as a principle gate dielectric layer in the transistor, is an effective approach to enhance the

transistor performance in complementary-metal-oxide-semiconductor (CMOS). The further reduction

in thickness of SiO2 thin films (i.e.< 2 nm) leads to an exponential increase in tunnelling current[1].

To overcome this problem, a thicker layer of high-k dielectric material as a substitute of SiO2 can be

used in transistors. There are various materials with high dielectric constant > 5, such as; ZrO2, TiO2,

HfO2, Ta2O5 and Al2O3[2]. Among these high-k materials, for the present work ZrO2 have been

considered as a gate dielectric layer due to its chemical and thermal stability with high dielectric

constant (~ 28). Solution-processable sol-gel method is an attractive approach for the deposition of

metal-oxide for the development of highly efficient low-cost transistor.Here in present work, a sol of

ZrO2 was synthesized by using a simple sol-gel method; further the thin layers were obtained by spin

coating. The effect of annealing of ZrO2 thin films at different temperature (150 C̊, 350 ̊C and 550 ̊C)

on structural, optical, morphological and electrical properties have been studied. XRD revealed that

the samples annealed at 350 and 550 ̊C leads to the formation of tetragonal structure of ZrO2, whereas,

the amorphous nature was observed for as-deposited and 150 ̊C annealed samples (figure 1). From

optical absorption the band gap was found to be 5.85 eV (as-deposited) to 5.79 eV (550 ̊C).

Figure 1. XRD pattern of ZrO2 thin

films annealed at different temperature

Keywords: ZrO2, High-k materials, sol-gel



Acknowledgement: The authors would like to thank the ISRO and SPPU for financial support.

References:

1. Seok-Woo Nam, Jun-Ho Yoo, Suheun Name, Hyo-Jick Choi, Dongwon Lee, Dae-Hong ko, Joo Ho

Moon, Ja-Hum Ku, Siyong Choi. Journal of Non-crystalline solids, vol. 303, pp. 139-143, 2002.

2. J. Robertsona, “High dielectric constant oxides,” The European Physical Journal Applied Physics, vol.

28, pp. 265–291, 2004.


Effect of annealing temperature on structural and optical properties of

rutile TiO2 nanoparticles

Yogesh V Hase1, Sampada Ghule

1, Sandesh R Jadkar

1, 2*

1*School of Energy Studies, Savitribai Phule Pune University, Pune, 411007. 2Department of Physics, Savitribai Phule Pune University, Pune, 411007.

Abstract The rutile TiO2 nanoparticles are synthesized by hydrothermal method and annealed at 200 ⁰C, 400

⁰C, 600 ⁰C and 800 ⁰C for 2 hour. Annealing temperature was varied to investigate its effect on the

surface morphology, structural and optical properties. The synthesized nanoparticles were

characterized with X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM), FTIR, Raman

spectroscopy and UV-VIS spectroscopy. The XRD results shows that with an increase in annealing

temperature, the value of the intensity of (110) peak increases while the value of the full-width at half

maximum decreases. The SEM result shows that, the morphology of TiO2 nanoparticles are

microspheres. The intensity in Raman spectra increases with increase in annealing temperature. The

UV-VIS shows that the band gap of TiO2 nanoparticles was found to decrease with increase in

annealing temperature.

Figure 1: X-ray diffraction pattern of Rutile TiO2 Figure 2: SEM of Rutile TiO2

Keywords: TiO2; annealing temperature. Microsphere, Rutile structure, hydrothermal synthesis



References:

1. Yang, Lei, Yu Bao, Chaoqian Li, Yajuan Zhang, Zixiu Wang, Yiwen Sun, and Minghuang Lin. In IOP

Conference Series: Materials Science and Engineering, vol. 711, no. 1, p. 012077. IOP Publishing,

2020. 2. Kumar, Pushpendra. Journal of the Gujarat Research Society 21, no. 10s (2019)

3. Yang, Zhiyong, Yu Wang, Xiaohong Xia, Kevin Peter Homewood, and Yun Gao. (2019).

4. Lin, C-P., H. Chen, A. Nakaruk, P. Koshy, and C. C. Sorrell. Energy Procedia 34 (2013).

5. Yuangpho, N., S. T. T. Le, T. Treerujiraphapong, W. Khanitchaidecha, and A. Nakaruk. Physica E:

Low-dimensional Systems and Nanostructures 67 (2015).


Zinc Oxide Nanostructures Sensitized with Plasmons for Efficient


Ebrima L Darboe, Pratibha Shinde, Vidya Doiphode, Vidhika Sharma, Mohit Prasad

and Sandesh Jadkar*



ABSTRACT

Photoelectrochemical splitting of water is the main focus of the present experimental study with the

help of Au Plasmons and ZnO nanostructures (ZNS). Plasmonic layer of Au is deposited as top layer

on electrochemically deposited different types of ZNS. Au modified ZNS exhibited better optical

absorption properties as plasmonic layer stimulates charge transfer and restrain charge recombination.

ZNS modified with Au had shown improved photocurrent density. One of the ZNS (i.e. nanosheets)

sensitized with Au had shown maximum photocurrent density of ~0.69 mA cm-2

, at a bias of 1.0

V/SCE. Structure and surface morphology of the synthesized photoanodes was studied using x-ray

diffraction and scanning electron microscopy. Optical characterization was done using UV–Visible

absorption spectroscopy and Raman spectroscopy. The IV characteristics, electrochemical impedance

spectroscopy, Mott–Schottky analysis, and photoconversion efficiency measurements have been used

to validate our observations of synthesized photoanodes. The results indicate that Au sensitized ZNS

can be a prospective material for PEC application.

Zinc Oxide Nanostructures, Electrodeposition; PEC water splitting; Photoanode KEYWORDS:

References:



119.


Study of Sputtered Multi-metallic Stacked Nanolayers effect on Cu2ZnSnS4

absorber for solar cell applications

Hemant Shirkea, Subhash Pandharkar

a,b, Sandesh Jadkar

a,b

aDepartment of Physics, Savitribai Phule Pune University, Pune, 411 007

bSchool of Energy Studies, Savitribai Phule Pune University, Pune, 411 007

ABSTRACT

In this work, Cu2ZnSnS4 (CZTS) thin-films were grown by sulfurization of metal precursors at 550C

in Ar (95%) + H2S (5%) environment. High quality CZTS thin films were obtained using multi-

stacking metallic nanolayer precursors. Using Sn and Zn as back and middle layers, respectively, is an

effective way to prevent the loss of Zn- or Sn-based compounds during the high-temperature process.

For the preparation of metallic stacked nanolayer precursors, we have developed 3-layers (3LYS), 6-

layers (6LYS) and 9-layers (9LYS) sequential deposition of ZnS/Sn/Cu metal stack onto Mo-coated

glass substrate by RF-sputtering. The stacking order of 3LYS metallic precursor was ZnS/Sn/Cu,

repeated 2-times for 6LYS and 3-times for 9LYS while keeping a final thickness of all stacked films

to approximately the same at around 670 nm. Due to inevitable metal inter-diffusion during the

sulfurization, we studied the effect of the ZnS/Sn/Cu metal stacking number (therefore, the layer

thickness) on the quality of thin film. This work explores some consequences of structural, optical and

morphological properties of grown CZTS thin films. The structural properties of CZTS thin films

studied using a combination of X-ray diffraction (XRD) and Raman spectroscopy. Structural analysis

showed that after sulfurization of these precursors, there is no difference in XRD peak positions

however; the difference in the intensities of the main peak (112) of CZTS can be seen. The (112) peak

intensity increases as we increase the metal stack (i.e. low for 3LYS and high for 9LYS). Raman

spectroscopy also confirms the formation of CZTS. The optical properties of samples are studied by

UV-Visible spectroscopy and it is observed that band gap (Eg) energy of CZTS for all samples around

1.5 eV. Surface morphology samples are studied by using field emission scanning electron

microscopy (FE-SEM) which showing that morphology changes with increasing metal stack. 3LYS

showing compact surface morphology with mountains of Cu2-xS, while 6LYS and 9LYS showing

uniform and compact morphology with some voids which create more surface area for junction

formation with cadmium sulfide (CdS) buffer layer. Oxidation states of all samples are confirmed by

X-ray photoelectron spectroscopy (XPS).

Keywords: CZTS, Sputtering, Multistack, XRD, Raman, XPS, diffusion

3LYS 6LYS 9LYS


Polycrystalline and stoichiometric growth of CZTS by hydrothermal

method

Kalyani Tikotea, Mahendra More

b ,Nandu Chaure

c

Department of Physics, Savitribai Phule pune University of Pune 411007, India

Abstract

The quaternary CZTS nanostructures were synthesized by simple, low cost hydrothermal method. We

studied the effect of the temperature in hydrothermal onto the kesterite CZTS phase formation.

Copper Chloride dehydrate (Cucl2.2H2O), Zinc Chloride (Zncl2), Tin Chloride pentahydrate

(Sncl2.5H2O) and L-cysteine were used as precursors and dissolved in double distilled with

continuous stirring. The as prepared solution was transferred into a Teflon autoclave and reaction

performed at different temperatures such as,140°C, 160°C,180°C, and 200°C for 30 h. The resultant

black precipitates were filtrated and washed several times with distilled water and ethanol. The final

products were dried in muffle furnace at 90°C for 1h at ambient condition .The obtained CZTS

powder was characterized by XRD, Raman spectra, SEM, EDS, UV-vis, and I-V and C-V

measurements study the structural, morphological, compositional ,optical properties and electrical

properties . The X-ray diffraction pattern of CZTS sample prepared at different reaction temperatures

revealed the prominent reflections at (112),(220) and (312) corresponds to tetragonal crystal

structure for CZTS [JCPDF: 26-0575][1] XRD results are further confirmed by Raman

measurements. A strongest peak exhibit at 338cm-1

associated to A1mode of CZTS due to vibration of

sulfur atoms [2].The surface morphology and elemental composition of sample prepared at 200°C

shows uniform, spherical particles of size ranging from 100 nm to 1μm. The band gap of as

synthesized CZTS was estimated around 1.45eV and 1.5eV suitable for solar cell applications. The

ideality factor η =2.9, barrier height ϕb = 0.23eV, flat band potential = 0.17V and carrier concentration

NA =4.997*1014

/cm3, were calculated by IV and CV measurements.

Keywords: CZTS, hydrothermal.



Acknowledgement: we are thankful to UPE-II program for financial support.

References:

1. Y. Cui, Z. Zhang, X. Du, W. Liu, Y. Deng, S. Liu,Alloys Compd. 1020 ,658, (2016)

2. T.Tiong, J.Bell , Hongxia ,W. Beilstein,. Nanoechnotl.5 ,438, (2014)


Synthesis, Characterization and exhibition of Field Electron Emission

characteristics of rGO

Nilofar Bagwan1, Pallavi Mutadak

2, and Mahendra More

2*

1Department of Physics, Annasaheb Magar Mahavidyalaya Hadapsar, Pune 411028

2Department of Physics, Savitribai Phule Pune University, Pune 411007

Abstract:

Graphene, a two-dimensional material, is now considered as a rewarding contestant for nanodevices

due to its morphology and novel properties. The chemical exfoliation and thermal annealing methods

are appraised as an inventive route towards the production of graphene at prodigious scale. This

method is utilized for the oxidation of graphite flakes having an oxidizing specialist and thermally

reduced the graphene oxide into reduced graphene oxide. We have examined the samples through

different characterization techniques. X-ray diffraction displayed the peaks of graphene oxide at 11.9°

and reduced graphene oxide at 25.2°. Raman Scanning electron microscopy images revealed the

multilayers morphology. The vertical alignment of graphene sheets or edges arrays can facilitate

efficient electron emission from the atomically thick sheets. Therefore they have even more a low

turn-on, threshold-field electronic field, and good current stability.

Keywords: GO, rGO, Field Electron Emission




Performance studies of a refractive type line focused, Fresnel lens solar

concentrator on horizontal and tilted surface

R. R. Udawanta, a#

, A.M.Pathakb, a

, M. G. Takwalec, a

S. V. Ghaisasd, a

, K. C. Mohitee, b*

aSchool of Energy Studies, Department of Physics, Savitribai Phule Pune University, PUNE, India,

bC.T.Bora college of Arts, Science and Commerce, Shirur, PUNE, India,

Abstract This paper presents development and performance evaluation of a Fresnel lens solar concentrator

(FLSC) system for steam cooking and industrial process heat application. Linear refracting type

Fresnel lens was used to concentrate the solar radiation on a receiver which is line focusing. The

Experimental investigations were carried out to determine the thermal performance of FLSC system.

A Fresnel lens having aperture area 2.84m2 was developed. The solar radiation, fluid temperatures,

ambient temperature, steam temperature and pressure were recorded. Performance parameters of

FLSC system namely thermal efficiency, rate of heat delivery and Co2 emission reduction were

obtained. A procedure has also been developed for thermal performance evaluation of Fresnel lens

solar concentrator system for direct steam generation. Thermal performance of FLSC system has been

done by evaluating useful heat gain from the system when exposed to solar radiation. The

performance of FLSC system has been studied on horizontal surface (β=0) and tilted surface

(β=18.52O, latitude of Pune) to achieve the maximum yield in order to maximize the system

performance. The overall efficiency has been improved due to the tilt angle (β). The overall efficiency

of FLS system is obtained around 49% at β =0 and 53% at β = 18.52O and can generate process steam

required in the industry. The expected heat delivery from the FLSC system is found to be 16,41,920

Kcals/year at β =0 and 17,76,016 Kcals/year at β = 18.52O which will be helpful for reduction of 1.73

tones at β =0 and 1.87 tones at β = 18.52O of CO2 emission yearly.

Keywords: steam generation, CST technologies, fresnel lens solar concentrator



Acknowledgement: The authors are thankful to Prof. S. R. Jadkar, Director, School of

Energy Studies, and Prof. S.W.Gosavi, Head, Department of Physics, SPPU, Pune, India for

providing laboratory facilities for this work.

References:

1. John A. Duffie and William A. Beckman : Solar Engineering of Thermal Processes”, Third Edition

(Year 2006)

2. Ralf Leutz, Akio Suzuki, Atsishi Akisawa and Takao Kashiwagi: Design of a Non imaging Fresnel lens

for solar concentrators, Solar Energy 65, 6, 379-387,(1999)

3. A newsletter of Industrial Research and Consultancy Centre, Solar Concentrator for Industrial

Process Heat, Update, IIT Bombay, Issue-1, (2006)

4. A. M. Pathak: Development and study of Fresnel lens based solar concentrator, PhD Thesis, University

of Pune (2009)

5. R. R. Udawant: study of performance of line focusing Fresnel lens solar concentrator” M.Phil. thesis,

S.P.Pune university, (July 2013)

6. S. P. Sukhatme and J. K. Nayak: Solar Energy, Principles of Thermal Collection and Storage, Tata

Mcgraw-Hill Publishing Company Limited, New Delhi (1996)

7. H. P. Gerg and J. Prakash: Solar energy fundamentals and applications, Tata Mcgraw-Hill Publishing

Company Limited, New Delhi (1997)

8. Vishal R. Sardeshpande , Ajay G. Chandak and Indu R. Pillai: Procedure for thermal performance

evaluation of steam generating point-focus solar concentrators, Solar Energy 85, 1390–1398 (2011)

9. Liang Zhang, Wujun Wang, Zitao Yu, Liwu Fan, Yacai Hu, Yu Ni, Jianren Fan and Kefa Cen: An

experimental investigation of a natural circulation heat pipe system applied to a parabolic trough solar

collector steam generation system, Solar Energy, 86, Issue 3, 911-919, (March 2012)


Kinetic study of sonodegradation of methylene blue

using spindle shaped cerium oxide

Sandhya Gadgea, Ashif H. Tamboli

a, K. P. Adhi

a, Suresh W Gosavi

a*

aDepartment of Physics, Savitribai Phule Pune University (Formerly University of Pune),

Pune 411 007, India.

E-mail address: [email protected]

*Corresponding author. Tel.: Phone: +91-20-25692678, Fax: +91-20-25691684

Abstract

The kinetics study for sonocatalytic degradation reaction of methylene blue (MB) was studied with

spindle shaped CeO2 nanocatalyst (ultrasonic power of 80 W at 40 kHz) at room temperature. The rate

constant was found to be maximum of about 18×10-3

min-1

for CeO2-2h with degradation efficiency of

about 90 %. The regression coefficient value, R2

indicating that the degradation of MB dye by the

spindle shaped CeO2 satisfactory followed apparent first order kinetics. The study reveals that CeO2

spindles can be excellent catalyst for dye degradation and water purification applications owing to

their excellent surface properties and novel morphology. [1]

Keywords: Cerium Oxide, Water treatment; Methylene blue, Kinetic study

Acknowledgement: Authors are thankful to JRD Tata Fellowship for financial support.

References:

1. Alireza Khataee, Peyman Gholami, Dimitrios Kalderis, Eleni Pachatouridoud, Michalis Konsolakis,

Ultrasonics – Sonochemistry, 2018, 41, 503–513.


Mechanical properties of RBC using Optical Tweezer

Sarika Hingea#

,A.G. Banpurkar and Gauri.R.Kulkarni*

aDepartment of Physics, Savitribai Phule Pune University, Pune-411007, India

Abstract

The optical tweezer is an excellent technique of imparting a force of pico-Newton in non contact

mode. In this work, optical tweezer along with IR laser (λ=980nm,Pmax=330mW) is used to trap

human RBC isolated from normal blood sample. Trapping force is measured by back focal plane

interferrometric technique. When the RBC is released from trap, it regains its original shape. Folding

time, recovery time and trapping force are related to the mechanical properties of RBC. Deformability

of RBC is important parameter in microcirculation. Further, mechanical properties of adult RBC are

compared with cord RBC.

Keywords: optical trap, RBC, back focal plane

Figure: Optical trapping of

single rbc

Figure: #: Presenting author: [email protected]


Acknowledgement:

The authors are thankful to the UGC-BSR, School of Basic Medical Sciences and

Department of physics for financial support.

References:

Lima CN1, Moura DS

2, Crisafuli FAP

3,

; Colloids Surf B Biointerfaces. 186:110671, 2019 )

Min-Cheng Zhong1,*, Xun-Bin Wei

1,2,*; NATURE COMMUNICATIONS,4:1768,(2019)

Trapped RBC

https://www.ncbi.nlm.nih.gov/pubmed/?term=Lima%20CN%5BAuthor%5D&cauthor=true&cauthor_uid=31816460

https://www.ncbi.nlm.nih.gov/pubmed/?term=Moura%20DS%5BAuthor%5D&cauthor=true&cauthor_uid=31816460

https://www.ncbi.nlm.nih.gov/pubmed/?term=Crisafuli%20FAP%5BAuthor%5D&cauthor=true&cauthor_uid=31816460

https://www.ncbi.nlm.nih.gov/pubmed/31816460


Synthesis and capacitive performance of MnO2/rGO nanocomposite for

Energy Storage Application

Sarika Jadhava, Ramchandra Kalubarme

b, V.P.Godbole

a, B.B.Kale

c,

S.W.Gosavia

aDepartment of Physics, University of Pune, Pune-411007.

bCentre for Materials for Electronic Technology, Shoranur Road, M.G. Kavu P.O. Athani, Thrissur–

680581 cCentre for Materials for Electronic Technology, Panchawati, Off. Pashan Road, Pune – 411008

Presenting author: [email protected].


Abstract The composite of graphene oxide integrated with MnO2 nanorods has been synthesized through

single step hydrothermal method in which oxidation of the Mn-precursor occurs on a graphene

surface and examine as an electrode material for energy storage application. In microstructural

investigation, a fine distribution of MnO2 nanorods over the entire graphene sheet is revealed from

transmission electron micrograph.The MnO2-rGO composite exhibits the enhancing charge storage

activity with small diffusion resistance. The electrochemical performance of the composite electrode

in a symmetric device formation had shown a high energy density of 42.7 Wh kg-1

corresponding to a

specific capacitance of 758 F g-1

. These composite electrodes also show excellent cycle life with

better capacity retention. The admirable capacitive features for energy storage devices are ascribed to

the MnO2/graphene composite structure, which not only delivers the passage for the electrons but also

enhance the ion transportation during fast charge–discharge reaction.

Figure: (a) TEM image of MnO2-rGO nanocomposite (b) CD of MnO2-rGO nanocomposite

Keywords: supercapacitor, hydrothermal,graphene





Synthesis and characterization of inorganic K3Bi2I9 thin films for lead-free

solution processed solar cells

Shruthi Nair1, Ajinkya Bhorde

1, Ravindra Waykar

1, Bharat Bade

1, Ashvini Punde

1,

Mrinalini Deshpande2, Rupali Kulkarni

1, Sandesh Jadkar

1*

1 Department of Physics, Savitribai Phule Pune University, Pune 411 007

2 Department of Physics, H.P.T. Arts and R.Y.K. Science College, Nasik 422 005

Abstract

Bismuth halide perovskites have been proposed as a non-toxic and chemically stable alternative to

lead halide perovskites. Despite being highly stable, the devices based on bismuth perovskites have

not been able to compete with the lead counterparts in terms of its efficiencies. The compounds that

have been extensively studied i.e. Cs3Bi2I9 and MA3Bi2I9 form 0D (dimer) structures that possess wide

indirect band gaps and poor charge transport properties which hinders the performance of devices

based on these materials. Theoretical studies have revealed that replacing bigger A cation like Cs/MA

by smaller cation like potassium (K) could favor the formation of layered 2D structures rather than 0D

structure. We attempted to synthesize inorganic K3Bi2I9 perovskite thin films by facile one-step spin

coating method and investigated its structural, optical and morphological properties. Our preliminary

studies on this material showed that the films deposited by one-step method favoured 0D structure

rather than 2D structure and no change in the band gap was observed with reduction in cation size.



Acknowledgement: Shruthi Nair acknowledges the Ministry of New and Renewable Energy

(MNRE), government of India for the financial support under the National renewable Energy

Fellowship (NREF) program. Sandesh Jadkar is thankful to the University grants Commission (UPE

program) New Delhi and Indo-French Centre for promotion of Advanced Research-CEFIPRA,

Department of Science and Technology, New Delhi for the financial support.

References

1. W. Park, B. Philippe, X. Zhang, H. Rensmo, G. Boschloo, E.M.J. Johansson, Bismuth Based

Hybrid Perovskites A3Bi2I9 (A: Methylammonium or Cesium) for Solar Cell Application, Adv.

Mater. 27 (2015) 6806–6813.

2.C. Preitschaft, Ternäre und quaternäre Materialien mit komplexen Thio-, Selenido- und Halogenido-

Anionen, (2004). http://epub.uni-regensburg.de/10371/.


Harvesting Artificial Light under Green Energy Technologies for Smart Cities

Chaitali V. Jagtap, Vishal S. Kadam and Habib M. Pathan* Advanced Physics Laboratory, Department of Physics,

Savitribai Phule Pune University, Pune 411 007

Abstract

The solar photovoltaics can harvest light energy and convert it into electrical energy by two

ways, outdoor and indoor. The indoor utilization of emerging photovoltaics is promising but power

conversion efficieny under indoor lighting is still challangeing. Dye sensitized solar cell is one of the

most excellent options to harvest and convert the artificial indoor light into electricity. DSC

technology delivers better performance under interior lightning because it can sustain performance

even at low incident power densities and because of the good match between emission spectra of the

dye, as both of them mainly span the range of visible wavelenght.

In present study we investigated the indoor performance of N3 sensitized Titania DSSCs

under artificial lighting. We observed a substantial improvement in PEC of solar cell. Under the

indoor illumination of LED light, the maximum PCE obtained was ~32%. The electron transport

properties were studied using electrochemical impedance spectroscopy, which supports JV

characteristics. Our findings suggests that the obtained high efficiency N3 sensitized Titania DSSCs

under artificial lighting have a good potential application for low power electronic devices for their

autonomous operation.

Acknowledgement: Authors are thankful to DST-SERI New Delhi for partial

financial support under the major research project scheme no. DST/TMD/SERI/S173(C).


Fabrication of MgO–Coated TiO2 Nano Porous Film for Dye Sensitized Solar Cell

Vishal S. Kadam, Chaitali V. Jagtap and Habib M. Pathan


Savitribai Phule Pune University, Pune - 411 007 India.

Abstract

The study reveals surface modification of TiO2 photoelectrodes coated with MgO for dye-

sensitized solar cells. Such a modification would be helpful for improving the solar light harvesting and

photon-to-electron conversion efficiency. Sol-gel-derived Magnesium acetate was coated onto TiO2 nano

porous film by dip coating technique.

The MgO-coated TiO2 electrode had been characterized by x-ray diffraction (XRD), energy-

dispersive x-ray spectroscopy (EDS), scanning electron microscopy (SEM) and UV–vis

spectrophotometer. The study reveals that the modification in TiO2 by MgO coating increases dye

adsorption, decreases trap states and suppresses interfacial recombination losses. MgO coating for

different times on the performance of DSSCs were investigated.

Acknowledgement: Authors are thankful to DST-SERI New Delhi for partial financial

support under the major research project scheme no. DST/TMD/SERI/S173(C).


Deposition of Al doped ZnO Thin Films: RF Magnetron Sputtering and

Physical Properties

Pankaj K. Bhujbal, Habib M. Pathan and Nandu B. Chaure*


Savitribai Phule Pune University

Pune - 411007, India.


Abstract

Transparent conducting oxide (TCO) thin films are always attractive to improve the electrical

conductivity without affecting its optical properties. Doping with some materials is one of the ways to

alter the properties of ZnO thin films. Aluminum is preferred as doping material because of its non-

toxicity and abundance. Doping with Aluminum is primarily done to achieve high transparency, stability

and conductivity of ZnO thin films, which have important applications in flat panel displays, photovoltaic

cells, light emitting diodes, sensors etc.

In present study, the Al:ZnO thin films are grown by using the RF magnetron sputtering

technique onto microscopic glass slides and optical, electrical, structural and morphological properties

were studied. Film deposited at 200 W have wurtzite crystal structure with (002) preferred orientation.

Highly transparent films were obtained with energy band gap ranging from 3.5 to 3.3 eV upon changing

the deposition powers from 50 - 200 W. The presence of Zni, VZn, V0 and V0+

defects were found from PL

spectra. Hall measurement data revealed that the film deposited at 200W RF power has minimum

resistivity of 4.2 x 10-3

Ωm.

Acknowledgment: Authors acknowledge Department of Science & technology, Government of India for

financial support vide Sanction order DST/TMD/SERI/S173 (G).


Synthesis of Gold Nanoparticles and their Size optimization using Low

Energy Ar+ Ion Irradiation Technique

Trupti T. Gaikwada*

, Akash P. Jadhava, Ashish B. Thorat

a, Deepti S. Sidhaye

a, Sanjay D.

Dhole, Vasant N. Bhoraskar, Shailendra. S. Dahiwalea

aDepartment of Physics, Savitribai Phule Pune University, Pune, Maharashtra 411007


Abstract

Gold nanoparticles were synthesized using low energy Ar-ion irradiation method. HAuCl4 was

mixed with two different reducing agents i.e. with Poly-vinyl Alcohol (PVA) and Poly-vinyl

Pyrrolidone (PVP) with different weight percentage.This solution was drop casted on glass film

and allowed to dry at room temperature. The drop casted films were then irradiated using Ar+

ions with different ion energy (10 keV, 20 keV, 30 keV and 40 keV) at constant ion fluence̴ of

1.33 X 1017

ions/cm2

and at a constant base pressure of 1x10-6

torr. The irradiated samples were

characterized by X-Ray Diffraction Spectroscopy (XRD), UV-visible spectroscopy (UV-Vis)

and Transmisson Electron Microscopy (TEM). In the present study, it is observed that PVA

plays a crucial role as a reducing agent as compared with PVP. Furthermore, it was observed that

when the PVA content was 20 wt. %, maximum reduction of HAuCl4 took place. Therefore,

solution prepared via mixture of HAuCl4 and PVA (20 wt %) was used for further experiment.

The plasmon absorption peak was observed to be shifting from 566 nm to 546 nm for energies

varying from 10 keV to 40 keV, respectively. The characteristic peaks of X-Rays and Plasmon

Absorption peak confirms the formation of gold nanoparticles due to ion irradiation. Also, the

result reveals that with the increase in the ion energy, particle size of gold nanoparticles is

reducing. Gold nanoparticles of different sizes in the range 10–100 nm can be synthesized in

controlled manner by varying the argon ion energy from 10 keV to 40 keV.

Figure: (a) UV-Visible spectrum of synthesized Au nanoparticles by Ar+ ion irradiation at different

energies (b) Typical TEM image of gold nanoparticles synthesized at 40 keV Ar+ ion energy

References:

1. K A. Bogle, et al 2006 Nanotechnology17 3204–320.

2. Porel S, et al 2005 Chem. Mater. 17 9

3. Temgire M K et al 2004 Radiation Phys. Chem. 71 1039


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