Conductometric gas sensors based on nanostructured WO3 thin films

Ahsan, Mohammed, Yarlagadda, Prasad K., & Tesfamichael, Tuquabo (2012) Conductometric gas sensors based on nanostructured WO3 thin films. In 2nd International Conference on Materials Science, Metal and Manufacturing (M3 2012), 19-20 November 2012, Hotel Fort Canning, Singapore.

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Nanostructured WO3 thin films have been prepared by thermal evaporation to detect hydrogen at low temperatures. 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.

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ID Code: 55563
Item Type: Conference Item (Keynote)
Refereed: Yes
Keywords: Nanostructured, Thin Film, Thermal Evaporation, Annealing
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Metals and Alloy Materials (091207)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 [please consult the author]
Deposited On: 12 Dec 2012 03:38
Last Modified: 13 Dec 2012 06:00

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