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Title: Low temperature CO sensitive nanostructured WO3 thin films doped with Fe
Authors: Ahsan, M
Tesfamichael, T
Ionescu, M
Bell, J
Motta, N
Keywords: Temperature measurement
X-ray detection
Issue Date: 20-Feb-2012
Publisher: Elsevier Science BV
Citation: Ahsan, M., Tesfamichael, T., lonescu, M., Bell, J., & Motta, N. (2012). Low temperature CO sensitive nanostructured WO3 thin films doped with Fe. Sensors and Actuators B-Chemical, 162(1), 14-21. doi:10.1016/j.snb.2011.11.038
Abstract: Nanostructured tungsten oxide thin film based gas sensors have been developed by thermal evaporation method to detect CO at low operating temperatures. The influence of Fe-doping and annealing heat treatment on microstructural and gas sensing properties of these films have been investigated. Fe was incorporated in WO3 film by co-evaporation and annealing was performed at 400 degrees C for 2 h in air. AFM analysis revealed a grain size of about 10-15 nm in all the films. GIXRD analysis showed that as-deposited films are amorphous and annealing at 400 degrees C improved the crystallinity. Raman and XRD analysis indicated that Fe is incorporated in the WO3 matrix as a substitutional impurity, resulting in shorter O-W-O bonds and lattice cell parameters. Doping with Fe contributed significantly toward CO sensing performance of WO3 thin films. A good response to various concentrations (10-1000 ppm) of CO has been achieved with 400 degrees C annealed Fe-doped WO3 film at a low operating temperature of 150 degrees C. © 2012, Elsevier Limited
Gov't Doc #: 4730
ISSN: 0925-4005
Appears in Collections:Journal Articles

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