Conductometric gas sensors based on nanostrutured WO3 thin films

Ahsan, M., Tesfamichael, T, & Yarlagadda , Prasad K. D. V. (2013) Conductometric gas sensors based on nanostrutured WO3 thin films. The GSTF Journal of Engineering Technology, 2(2), pp. 1-5.

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Abstract

Nanostructured WO3 thin films have been prepared bythermal evaporation to detect hydrogen at low t emperatures. The influence of heat treatment on the physical, chemical and electronic properties of these films has been investigated. The films were annealed at 400oC for 2 hours in air. AFM and TEM analysis revealed that the as-deposited WO3 film is high amorphous and made up of cluster of particles. Annealing at 400oC for 2 hours in air resulted in very fine grain size of the order of 5 nm and porous structure. GIXRD and Raman analysis revealed that annealing improved the crystallinity of WO3 film. Gas sensors based on annealed WO3 films have shown a high response towards various concentrations (10-10000 ppm) H2 at an operating temperature of 150oC. The improved sensing performance at low operating temperature is due to the optimum physical, chemical and electronic properties achieved in the WO3 film through annealing. - See more at: http://dl4.globalstf.org/?wpsc-product=conductometric-gas-sensors-based-on-nanostructured-wo3-thin-films-2#sthash.IrfhlZ6H.dpuf

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ID Code: 71489
Item Type: Journal Article
Refereed: Yes
Keywords: Nanostructured, Thin Films, WO3, Thermal Evaporation, Annealing
ISSN: 2251-3701
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 13 May 2014 05:09
Last Modified: 14 May 2014 01:41

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