Effects of gas diffusivity and reactivity on sensing properties of thick film SnO2-based sensors

被引：108

作者：

Shimizu, Y ^{[1
]}

Maekawa, T ^{[1
]}

Nakamura, Y ^{[1
]}

Egashira, M ^{[1
]}

机构：

[1] Nagasaki Univ, Fac Engn, Dept Mat Sci & Engn, Nagasaki 852, Japan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1998年 / 46卷 / 03期

关键词：

gas diffusivity; gas reactivity; SnO2; sensors;

D O I：

10.1016/S0925-4005(97)00247-5

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Effects of gas diffusivity and reactivity on gas-sensing properties of porous thick him SnO2-based sensors have been investigated by employing several kinds of objective gases. The interior of a pure SnO2 sensor was confirmed to exhibit higher sensitivity to H-2 than the surface. A reverse tendency was observed for CH4 or C2H5OH with larger molecular size than O-2. Excess enhancement in catalytic activity of sensor materials, for example by loading 1.0 wt% Pt or Pd, resulted in deterioration of the interior H-2 sensitivity, while the interior CH4 or C2H5OH sensitivity was enhanced by the Pt or Pd loading. Loading of 1.0 wt% Au led to significant enhancement in both the interior and the surface H-2 sensitivity, irrespective of the small chemical sensitization effect of Au. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：163 / 168

页数：6

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