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Abnormal current-voltage characteristics of $SnO_2$ oxide semiconductor and their application to gas sensors  

Lee Kyu-chung (아주자동차대학 인터넷정보계열)
Yoon Ho-Kun (목원대학교 컴퓨터교육과)
Hur Chang-Wu (목원대학교 IT공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.7, 2004 , pp. 1436-1441 More about this Journal
Abstract
Abnormal current-voltage characteristics of an oxide semiconductor have been investigated and a novel method of detecting reducing gases utilizing self-heating mechanism of sensing layer without an additional heater has been developed. Planar-type sensors based on WO3-doped SnO2 were fabricated using a screen-printing technique. The applied voltage across the sensing layer caused heating of the sensing layer and the current abruptly varied upon exposure to a gas mostly as a result of surface reactions. A unique and fascinating aspect of the gas sensing scheme is that no additional heater is necessary for detection. The new sensing method has been applied to C2H5OH gas in this preliminary work.
Keywords
$SnO_2$;
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Times Cited By KSCI : 1  (Citation Analysis)
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