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Selective Detection of Formaldehyde Gas Using a Cd-Doped TiO2-SnO2 Sensor
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, P. R. China
World Premier International Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
* Authors to whom correspondence should be addressed.
Received: 9 October 2009; in revised form: 28 October 2009 / Accepted: 29 October 2009 / Published: 13 November 2009
Abstract: We report the microstructure and gas-sensing properties of a nonequilibrium TiO2-SnO2 solid solution prepared by the sol-gel method. In particular, we focus on the effect of Cd doping on the sensing behavior of the TiO2-SnO2 sensor. Of all volatile organic compound gases examined, the sensor with Cd doping exhibits exclusive selectivity as well as high sensitivity to formaldehyde, a main harmful indoor gas. The key gas-sensing quantities, maximum sensitivity, optimal working temperature, and response and recovery time, are found to meet the basic industrial needs. This makes the Cd-doped TiO2-SnO2 composite a promising sensor material for detecting the formaldehyde gas.
Keywords: volatile organic compound; formaldehyde; TiO2-SnO2; Cd doping; gas sensor
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Zeng, W.; Liu, T.; Wang, Z.; Tsukimoto, S.; Saito, M.; Ikuhara, Y. Selective Detection of Formaldehyde Gas Using a Cd-Doped TiO2-SnO2 Sensor. Sensors 2009, 9, 9029-9038.
Zeng W, Liu T, Wang Z, Tsukimoto S, Saito M, Ikuhara Y. Selective Detection of Formaldehyde Gas Using a Cd-Doped TiO2-SnO2 Sensor. Sensors. 2009; 9(11):9029-9038.
Zeng, Wen; Liu, Tianmo; Wang, Zhongchang; Tsukimoto, Susumu; Saito, Mitsuhiro; Ikuhara, Yuichi. 2009. "Selective Detection of Formaldehyde Gas Using a Cd-Doped TiO2-SnO2 Sensor." Sensors 9, no. 11: 9029-9038.