期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 141, 期 2, 页码 361-369出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.07.001
关键词
Gas sensor; Tin oxide; Thermo cyclic; Measurement conditions; Dynamic mode
资金
- Deutsche Bundesstiftung Umwelt, Osnabruck
- Heraeus Sensor Technology, Kleinostheim German
The conductance of several tin oxide gas sensitive layers was simultaneously measured in thermo-cyclic and isothermal operation mode at various concentrations of CO and propene in air, respectively. Different measurement conditions were set by the cycle time, the gas flow rate, the humidity and the thickness of the sensitive layer. The sensor response is expressed by the conductance-over-time profiles (CTPs), the gas sensitivity or by the sum of the CTP sampling points. The resultant sensitivities from the CTPs were found to be higher than those of the isothermal measurements. The CTPs considerably change with the kind of gas as well as with the variation of the measurement conditions. This is discussed for both types of target gases with respect to the temperature, the adsorbates assumed and the reaction kinetics in relation to the gas transport conditions in the porous gas sensitive layer. (C) 2009 Elsevier B.V. All rights reserved.
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