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pp.193-198
WO3-doped SnO2 thin films were prepared in a solution-deposition method and their gas-sensing characteristics were investigated. The doping of WO3 to SnO2 increased the response (Ra/Rg, Ra: resistance in air, Rg: resistance in gas) to H2 substantially. Moreover, the Ra/Rg value of 10 ppm CO increased to 5.65, whereas that of NO2 did not change by a significant amount. The enhanced response to H2 and the selective detection of CO in the presence of NO2 were explained in relation to the change in the surface reaction by the addition of WO3. The WO3-doped SnO2 sensor can be used with the application of a H2 sensor for vehicles that utilize fuel cells and as an air quality sensor to detect CO-containing exhaust gases emitted from gasoline engines.
