Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
COMUNICAÇÃO TÉCNICA ______________________________________________________________________________________________________________________________________________________________________________________________________
Nº 176485
Development of microfluidic devices for graphene oxide fibers preparation Jaqueline Falchi da Rocha Roberta Mansini Cardoso Mario Ricardo Gongora-Rubbio Cecília Carvalho Castro e Silva
Pôster apresentado no BRAZIL-ARGENTINIE MICROFLUIDICS CONGRESS, 2., 2019, Córdoba-Argentina
A série “Comunicação Técnica” compreende trabalhos elaborados por técnicos do IPT, apresentados em eventos, publicados em revistas especializadas ou quando seu conteúdo apresentar relevância pública. ___________________________________________________________________________________________________
Instituto de Pesquisas Tecnológicas do Estado de São Paulo
S/A - IPT Av. Prof. Almeida Prado, 532 | Cidade Universitária ou
Caixa Postal 0141 | CEP 01064-970 São Paulo | SP | Brasil | CEP 05508-901
Tel 11 3767 4374/4000 | Fax 11 3767-4099
www.ipt.br
Optical Images of GO Fiber
Development of Microfluidic Devices
for Graphene Oxide Fibers Preparation Rocha, J. F. 1,2, Cardoso, R. M.2, Gongora-Rubio, M. R.2, Silva, C. C. C.1
1MackGraphe –Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, São Paulo, Brazil,
2Micromanufacturing Laboratory (LMI), Bionanomanufacturing Center, Technological Research Institute, IPT, São Paulo, SP, Brazil.
* email address: [email protected]
ACKNOWLEDGEMENTS
EXPERIMENTAL
RESULTS
Annealing
30 min annealing time
300 °C
Ar/ H2
MW Treatment
100W
CTAB
Graphene Graphene and
Derivatives Fibers
Tensile strength
130 GPa
Tensile strength
501 mPa
Electric conductivity
108 S/m
Electric conductivity
4.1x104 S/m
Elastic modulus
1.1 TPa
Elastic modulus
11 GPa
Goal
Fiber
Applications Graphene and Derivatives
Fibers - Properties
CONCLUSIONS
Challenges INTRODUCTION
Cables and wires;
Microelectrodes;
Supercapacitors;
Wearable Devices;
Biosensors.
(LEE, C. et al JKMS v. 34, 2019 --- MENG, F. et al. Advanced Materials, v. 27, 2019)
(XU, Z. et al. Materials Today, v. 18, 2015 --- ZHEN, X. et al. Advanced Materials, v. 25, 2013)
Scalable preparation of the graphene derivatives fibers
keeping their unique properties.
Optimization of GO fibers preparation with hydrodynamically
focused ceramic based devices, followed by heat treatments
to obtain excellent quality reduced graphene oxide (rGO)
fibers.
Produce a hydrodynamically focused microfluidic device
based on Low Co-Fired Ceramics (LTCC) technology using
ceramic sheets to promote the best alignment of graphene
oxide (GO) sheets.
Modified Hummers’ Method
(HIRATA, M. et al. Carbon, v. 42, 2004)
(POTTS, J. R. et al. Advanced Materials, v. 45, 2012)
(VOIRY, D. et al. Science, v. 353, 2016)
GO Reduction
CTAB (0.05% m/v)
Addition of graphite, sodium nitrate and
sulfuric acid;
Wash with HCl (10%), Dyalisis until pH 5.5.
Raman Spectroscopy
SEM Images
Fibers Resistivity (ρ) (Ω . cm )
GO Fibers ND
rGO Fibers Annealing 37.83 x 10-3 ± (22.7x 10-3)
rGO Fibers Annealing + MW 5.24x10-3 ± (3.07 x 10-3)
Electrical Resistance
GO Fiber rGO Fiber
Annealing
rGO Fiber
Annealing
+ MW
Ceramic based hydrodynamic focusing devices have been shown to be able to produce
GO fibers in a scalable and quality manner. The MW heat treatment promotes an rGO
with structural properties similar to a CVD multilayer graphene. Thus rGO fibers are
excellent candidate for microsensor and microsupercapacior development.
GO Fiber rGO Fiber Annealing + MW
*n=7
Carbon Nanomaterial La (nm)
rGO Fibers Annealing + MW 204.0 ± ( 21.0)
CVD Graphene 186.0 *n=7
Electrical Resistivity Crystalline Domain Size (La)
Solution
Development of
Microfluidic Devices Graphene Oxide
(GOMES, H.C. et al. v. 9, Micromachines, 2018)
Thickness between 150-160 µm
Microfluidic Device
Flexible fibers
42 cm length
DRYING
Fiber - Microfluidic Devices
Effect of the
Coagulant Agente in
the Formation of the
GO Fibers
capa176485Rocha, J. F._II Congress_Brazil_Argentina__IV_Microfluidics-22 a 25.10.2019