Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Sensors & Transducers Journal 2008 Sensors & Transducers Journal 2007 2000-2002 S&T e-Digest Contents
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Vol. 108, Issue 9, September 2009, pp. 168-179
Sn-doped Zinc Oxide Thin Films for Methanol
1 Department of Physics, Assam University Silchar, Silchar-788018, Assam, India
1E-mail: nathss1@rediffmail.com
Received: 13 July 2009 /Accepted: 21 September 2009 /Published: 28 September 2009
Abstract: Sn doped zinc oxide (ZnO:Sn) thin films have been prepared by chemical spray pyrolysis technique with dopant concentration (Sn/Zn at %) from 0 to 1.5 at %. The structural, morphological, optical and electrical properties of the films are explored and then tested for methanol sensing. The resistivity of the films decreases with Sn doping up to 0.5 at %, while at higher doping concentration the disorder produced in the lattice causes an increase in resistivity of the films. Exposure of methanol decreases the resistance of the films. The response of the film is measured for both ZnO and ZnO:Sn films at different operating temperature (200-350 0C) and concentration (ppm) of methanol in air. It is observed that ZnO:Sn films are more sensitive to methanol than undoped ZnO film. The maximum response (~53 %) is observed for 0.5at % ZnO:Sn film to 500 ppm of methanol in air at 300 0C. Further the films have shown faster response and recovery times at higher operating temperatures.
Keywords: ZnO:Sn, Thin film, Spray pyrolysis, Methanol vapour
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