Detection mechanism of TiO2-based ceramic H2 sensors

被引:42
作者
Mather, GC [1 ]
Marques, FMB [1 ]
Frade, JR [1 ]
机构
[1] Univ Aveiro, UIMC, Dept Ceram & Glass Engn, P-3810 Aveiro, Portugal
关键词
electrical properties; TiO2; sensors;
D O I
10.1016/S0955-2219(98)00338-0
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This work reports an H-2-sensing mechanism of TiO2 thick-films, deposited on alumina substrates by screen-printing. The role of the catalytic activity of the electrode material on the sensor response was tested with platinum and gold electrodes. An impedance analyser (20 Hz-1 MHz) was used to monitor the film impedance before and after exposure to H-2. Continuous monitoring of the film resistance was performed with a simple dc measurement. The film resistance was measured as a function of temperature (500-650 degrees C), time, and gas phase composition (air and 0-10% H-2 in a N-2-based gas stream). The equilibrium gas phase PO2 (monitored with a zirconia-based oxygen sensor) was also used to identify the hydrogen detection mechanism of the films. (C) 1999 Elsevier Science Limited. All rights reserved.
引用
收藏
页码:887 / 891
页数:5
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