Synthesis and Characterization of ZnO Nano Fibers for Hydrogen

Detection

Normarieli M. Passalacqua AlvaradoRISE Program

Professors and Mentors: W. Otaño Ph.D.CIM Laboratory

CIMCentro de

Investigación en Materiales

Outlook: Introduction of nano materials, fibers, Zinc Oxide, electrospinning and sputtering

techniques.

Problem presented.

Hypothesis

Objectives

Methodology

Preliminary results

References

Introduction Nano materials:

Scale of 10-9 m Large surface area

Fig 1: Carbon nanotubes

http://www.taringa.net/comunidades/nanotecnologia/5086975/Nanotecnologia-bienvenida-info.html

Fibers Some uses are:

Tissue scaffolds, e.g., filtration of proteins Delivery of drugs to the humans cells Gas sensors Energy storage Catalysis

Zinc Oxide Semiconductor with large number of applications.

Has good chemical and physical properties.

Low cost

Fig 3: Atoms arrange of ZnO

Electrospinning Technique

Fig 4: Electrospinning process

http://ppl.ippt.gov.pl/18-few-words-about/17-electrospinning

Sputtering

http://www.angstromsciences.com/magnetron-sputtering-deposition

Problem What we want?

Detect gasses as hydrogen and ethanol quickly.

Hypothesis A ZnO nanometric structure with large surface area can be used as a

sensitive hydrogen gas sensor.

Objectives Create poly (ethylene oxide) micro-to-nano fibers by electrospinning technique.

Deposit Zn and ZnO by Sputtering on top of fibers.

Create nanoshells by heat treatment.

Use the Energy Dispersive Spectroscopy (EDS) to characterize composition.

Use the Scanning Electron Microscope (SEM) to study the nanoshells morphology.

Test the samples as hydrogen gas sensors.

Methodology:

1)Forming PEO fibers.

2) Zn and ZnO (direct)

deposition

3) Heat the samples (450°

C for 2h).4) Sample

analysis and electrical

measurements

Preliminary Results Successful forming of fibers.

Successful forming of nanoshells.

Highly percent in the samples of ZnO nanoshells sputtered with Zn and then oxidized by heat treatment.

The minimum sensitivity percent of the samples have to be of 9.2%.

Acknowledgements RISE program

CIM laboratory

References Sui, X.; Shao, C.; Lin, Y. 2007. Photoluminescence of polyethylene oxide-ZnO

composite electrospun fibers. J. Elesevier.48:1459-1463.

Park, J.; Moon, J.; Lee, S.; Lim, S.; Zyung, T. 2009. Fabrication and characterization of ZnO nanofibers by electrospinning. J. Elsevier, 9:S210-S212.

Yamazoe, N. 2005. Toward innovations of gas sensor technology. J. Elsevier. 108:2-14.

Yang, X.; Shao, C.; Guan, H.; Li, X.; Gong, J. 2004. Preparation and characterization of ZnO nanofibers by using electrospun PVA/zinc acetate composite fiber as precursor. J. Elselvier, 7:176-178.

Synthesis and Characterization of ZnO Nano Fibers for Hydrogen

Detection

Normarieli M. Passalacqua AlvaradoRISE Program

Professors and Mentors: W. Otaño Ph.D.CIM Laboratory

CIMCentro de

Investigación en Materiales