| 산화성 가스에 대한 SnO2모물질 가스센서의 감지특성 |
| 정해원, 박희숙, 김종명, 윤기현1 |
국방과학연구소
1연세대학교 세라믹공학과 |
| Responses of SnO2-based Sensors for Oxidizing Gases |
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| ABSTRACT |
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The effects of additives in n-type semiconducting SnO$_2$-based gas sensors on oxidizing gases were investigated. The resistivity of SnO$_2$ sensors decreased when exposed to reducing gases, which act as electronic donors. However, the resistivities of the SnO$_2$ sensors increased when exposed to oxidizing gases, which act as electronic accepters. The products formed from the reaction of oxidizing gases ever SnO$_2$-based powders were analyzed by gas chromatography as compared with those formed from the reaction of reducing gases of alcohols. The SnO$_2$ sensors doped with PdCl$_2$ or A1$_2$O$_3$ showed unique dual response patterns toward oxidizing gases of $CH_3$CN and $CH_3$NO$_2$ depending on the operating temperature. The combination of these two sensors along with proper pattern recognition technique could enhance the selectivity for the gases with electron-accepting groups. |
| Key words:
Tin oxide, Gas sensor, Oxidizing gas, Gas chromatography |
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