Gas sensing by thermoelectric voltage fluctuations in SnO2 nanoparticle films

被引：35

作者：

Smulko, JM

Ederth, J

Li, YF

Kish, LB ^{[1
]}

Kennedy, MK

Kruis, FE

机构：

[1] Texas A&M Univ, Dept Elect Engn, College Stn, TX 77843 USA

[2] Univ Duisburg Essen, Fac Engn Sci, D-47057 Duisburg, Germany

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2005年 / 106卷 / 02期

关键词：

fluctuation-enhanced sensing; nanoparticles; stochastic processes; bias-free Taguchi sensor;

D O I：

10.1016/j.snb.2004.09.021

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Experimental results of gas sensing by thermoelectric voltage fluctuation measurements in gas sensors are presented. The applied sensors consist of monodispersed SnO2 nanoparticles films, with a mean diameter of 20 nm. The voltage fluctuations in the sensor films were observed with and without external voltage bias and its power density spectrum exceeded at least a thousand times its thermal noise. The power density spectrum of the observed stochastic signal changed in different gases by a factor of three while the change of the sensor resistance was only 2-3%. The stochastic signal observed in the sensor without external voltage bias is caused by the temperature gradient in the film. The results show that thermoelectric fluctuations, without external voltage bias, can be applied for use in gas sensing. (c) 2004 Elsevier B.V All rights reserved.

引用

页码：708 / 712

页数：5

共 13 条

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