Model of the thickness effect of SnO2 thick film on the detection properties

被引：24

作者：

Montmeat, P ^{[1
]}

Lalauze, R ^{[1
]}

Viricelle, JP ^{[1
]}

Tournier, G ^{[1
]}

Pijolat, C ^{[1
]}

机构：

[1] Ecole Natl Super Mines, Ctr SPIN, LPMG, CNRS,UMR 5148, F-42023 St Etienne, France

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2004年 / 103卷 / 1-2期

关键词：

tin oxide; space charge area; thick film; electrical conductivity; modeling;

D O I：

10.1016/j.snb.2004.04.039

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The variations of the electrical response of SnO2 thick film sensors (10-80 mum) prepared by screen-printing technology versus their thickness depend on the studied gases: at 500 degreesC, the ratio G(gas)/G(air) for CO (300 ppm) presents a maximum while the ratio for ethanol (100 ppm) continuously decreases with increasing thickness. A simplified geometrical model based on a resistivity distribution within SnO2 depleted area, depending on oxygen consumption by the reducing gas, is presented. This model takes into account the role of the metal (gold electrodes) which enhances the creation of space charge area thanks to the three boundary points "gas-metal-oxide". Calculation of conductance (G) using the proposed model allows to simulate the influence of the thickness on the response for both studied gases. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：84 / 90

页数：7

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