HYDROGEN-SENSING MECHANISM OF ZINC-OXIDE VARISTOR GAS SENSORS

被引：53

作者：

LIN, FC

TAKAO, Y

SHIMIZU, Y

EGASHIRA, M

机构：

[1] Department of Materials Science, Engineering Faculty of Engineering, Nagasaki University, Nagasaki, 852

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1995年 / 25卷 / 1-3期

关键词：

HYDROGEN SENSORS; VARISTORS; ZINC OXIDE;

D O I：

10.1016/0925-4005(95)85186-0

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The hydrogen-sensing properties of ZnO varistors have been investigated as a function of their Cr2O3 content. The addition of an appropriate amount of Cr2O3 results in an enhancement of the H-2 sensitivity, since a relatively large shift in the breakdown voltage towards the direction of a low electric field is observed in the presence of H-2. The results presented in this study strongly suggest the important role of excess oxygen ions existing at ZnO-ZnO grain boundaries in both the H-2 - sensing mechanism and in the formation of a double Schottky barrier, the latter being responsible for the nonlinear I-V characteristics of the varistors.

引用

页码：843 / 850

页数：8

共 18 条

[1] MICROSTRUCTURE AND CRYSTAL-STRUCTURE OF BISMUTH OXIDE PHASES IN ZINC-OXIDE VARISTOR CERAMICS [J].