A dynamic response model for the WO3-based ozone sensors

被引：43
|
作者：
Guerin, J. [1 ]
Bendahan, A. [1 ]
Aguir, K. [1 ]
机构：
[1] Univ Paul Cezanne Aix Marsille 3, Fac Sci & Tech St Jerome, L2MP UMR 6137, CNRS, F-13397 Marseille, France
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2008年 / 128卷 / 02期
关键词：
gas sensors; tungsten trioxide; ozone; adsorption; electrical conduction; dynamic response; numerical simulation;
D O I：
10.1016/j.snb.2007.07.010
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
In this paper, a dynamic model based on the Wolkenstein adsorption theory is developed for temperatures equal to or less than 250 degrees C and non-dissociative adsorption. We assumed that the ozone detection mechanism Of WO3-based gas sensors in dry air is essentially due to adsorption of species O-2, O-2(-), O and O- at the surface of the grains. The simulation results are compared to the experimental ones. The correlation between simulated and experimental results is rather good. The model is then extended to the dissociative adsorption and higher temperatures. At temperature higher than 300 degrees C, an increase in the recovery time appears on experimental results and cannot be explained by a simple adsorption/desorption mechanism. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：462 / 467
页数：6
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