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Ahsan, Mohammed
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Publications (7/7 displayed)
- 2014Gas sensing of ruthenium implanted tungsten oxide thin filmscitations
- 2013Ethanol sensitivity of thermally evaporated nanostructured WO3 thin films doped and implanted with Fecitations
- 2013Conductometric gas sensors based on nanostructured WO3 thin films
- 2012Gas sensing characteristics of Fe-doped tungsten oxide thin filmscitations
- 2012Conductometric gas sensors based on nanostructured WO3 thin films
- 2012Low temperature CO sensitive nanostructured WO3 thin films doped with Fecitations
- 2011Sensing properties of e-beam evaporated nanostructured pure and iron-doped tungsten oxide thin filmscitations
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article
Conductometric gas sensors based on nanostructured WO3 thin films
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 atan 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