Characteristics and sensing properties of dipped La0.8Sr0.2Co1-xNixO3-δ film for CO gas sensors

被引：49
|
作者：
Chiu, CM [1 ]
Chang, YH [1 ]
机构：
[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 70101, Taiwan
来源：
THIN SOLID FILMS | 1999年 / 342卷 / 1-2期
关键词：
gas sensor; dipping method; perovskite phase; sensitivity;
D O I：
10.1016/S0040-6090(98)01071-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
La0.8Sr0.2Co1-xNixO3-delta films (x = 0.4, 0.5 and 0.6) prepared by dipping method showed maximum sensitivity to 50 ppm CO at a lower operating temperature (180-200 degrees C). The sensing properties of La0.8Sr0.2Co1-xNixO3-delta films to CO are a function of temperature and Ni content. The maximum sensitivity was obtained for a doping of 50 mol% Ni at an operating temperature of 200 degrees C. The response mechanism of sensitivity of metal oxides to CO gas is a surface reaction process and this reaction was thermally activated. The log-log plots of G/G(0) to CO concentration showed a linear relationship. The resistivity of the films is also showed as a function of CO concentration. Tn an exponential plot of resistivity versus CO concentration, the experimental results give a good march to the relationship of R approximate to KCCOalpha. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：15 / 19
页数：5
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