期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 181, 期 -, 页码 340-347出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.01.018
关键词
Semiconductor gas sensors; P-type; Reducing gas; Modeling; Temperature; Response
The detection mechanism in gas sensors based on semiconductor materials is mainly due to charge-transfer. The interaction between the semiconductor surface and the gas is approached by the theory of chemisorption. Based on the Wolkenstein adsorption model, we propose a model simulating the reaction between the ionized oxygen species adsorbed at the surface of a p-type semiconductor with a reducing gas as a function of: (i) work temperature; (ii) oxygen pressure; (iii) gas concentration; and (iv) characteristic properties of the semiconductor/gas interaction. The influence of the main parameters of the model on sensor performance is analyzed through the response curve as a support tool for the design and optimization of suitable materials for a desired sensing application. (C) 2013 Elsevier B.V. All rights reserved.
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