Dependency of SnO2 System Carbon Monoxide Gas Sensor on the Atmospheric Temperature & Humidity

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J. Korean Ceram. Soc. > Volume 27(8); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(8): 1004.

$SnO_2$계 일산화탄소 가스 감지 소자의 주위온도, 습도 의존성에 관한 연구

정형진, 김종만, 이전국

한국과학기술연구원 무기재료연구실

Dependency of SnO2 System Carbon Monoxide Gas Sensor on the Atmospheric Temperature & Humidity

ABSTRACT

SnO2-ThO2-PdCl2-In2O3 gas sensing ceramic systems were studied in order to lowr the operating temperatures and reduce the dependence of ambient temperatures and humidities. Sensing materials were coated by brush on the alumina tube followed by the impregnation of solidfier(ethylsilicate). Coated species were dried and sintered at 75$0^{circ}C$ for 30min. carbon monoxide gas detecting sensitiviteis were measured in various ambinet temperatures and humidities. In the composition of 94SnO2-5ThO2-PdCl2 system carbon monoxide gas detecting sensors showed the highest detecting sensitivities and the lowest operating temperature(15$0^{circ}C$). As the ambient temperatures and humidities were increased, sensitivities were decreased. Because the oscillation effects were observed at high humidities, it was suggested that the sensitivities of sensors depend greatly on the humidities.