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Sensors 2011, 11(3), 2982-2991; doi:10.3390/s110302982

Application of V2O5/WO3/TiO2 for Resistive-Type SO2 Sensors

1 Functional Materials Laboratory, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany 2 National Institute of Advanced Industrial Science and Technology (AIST), Advanced Manufacturing Research Institute, 2266-98 Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan
* Author to whom correspondence should be addressed.
Received: 11 February 2011 / Revised: 1 March 2011 / Accepted: 3 March 2011 / Published: 7 March 2011
(This article belongs to the Special Issue Gas Sensors - 2010)
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A study on the application of V2O5/WO3/TiO2 (VWT) as the sensitive material for resistive-type SO2 sensor was conducted, based on the fact that VWT is a well-known catalyst material for good selective catalytic nitrogen oxide reduction with a proven excellent durability in exhaust gases. The sensors fabricated in this study are planar ones with interdigitated electrodes of Au or Pt. The vanadium content of the utilized VWT is 1.5 or 3.0 wt%. The resistance of VWT decreases with an increasing SO2 concentration in the range from 20 ppm to 5,000 ppm. The best sensor response to SO2 occurs at 400 °C using Au electrodes. The sensor response value is independent on the amount of added vanadium but dependent on the electrode materials at 400 °C. These results are discussed and a sensing mechanism is discussed.
Keywords: sulfur dioxide; selective catalytic reduction (SCR); gas sensor; vanadia tungsten titania sulfur dioxide; selective catalytic reduction (SCR); gas sensor; vanadia tungsten titania
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Izu, N.; Hagen, G.; Schönauer, D.; Röder-Roith, U.; Moos, R. Application of V2O5/WO3/TiO2 for Resistive-Type SO2 Sensors. Sensors 2011, 11, 2982-2991.

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