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Low temperature CO sensitive nanostructured WO3 thin films doped with Fe

Ahsan, Mohammed, Tesfamichael, Tuquabo, Ionescu, Mehail , Bell, John M., & Motta, Nunzio (2012) Low temperature CO sensitive nanostructured WO3 thin films doped with Fe. Sensors and Actuators B : Chemical, 162(1), pp. 14-21.

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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 400oC for 2 hours 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 400oC 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 towards CO sensing performance of WO3 thin films. A good response to various concentrations (10-1000 ppm) of CO has been achieved with 400oC annealed Fe-doped WO3 film at a low operating temperature of 150oC.

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6 citations in Scopus
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5 citations in Web of Science®

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ID Code: 47890
Item Type: Journal Article
Keywords: Tungsten oxide, Nanostructured thin films, Fe doping, Thermal evaporation, CO gas sensing
DOI: 10.1016/j.snb.2011.11.038
ISSN: 0925-4005
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200)
Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000) > NANOTECHNOLOGY (100700)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 Elsevier
Copyright Statement: This is the author’s version of a work that was accepted for publication in Sensors and Actuators B : Chemical. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Sensors and Actuators B : Chemical, Volume 162, Issue 1 (2012). DOI: http://dx.doi.org/10.1016/j.snb.2011.11.038
Deposited On: 23 Dec 2011 08:16
Last Modified: 09 Sep 2013 12:51

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