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Journal of the Korean Ceramic Society 1995;32(11): 1283. |
| 다공질 ZnO의 전기적 특성, 환원성 가스 감응 특성 및 습도의 영향 |
| 윤당혁, 최경만 |
| 포항공과대학교 재료금속공학과 |
| Electrical Conductivity, Flammable Gas Response and Humidity Effect of Pporous ZnO |
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| ABSTRACT |
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The electrical conductivity, flammable gas response and their humidity effect of porous ZnO, added with 5wt% corn starch as the fugitive phase, were examined. Porous ZnO showed different conductivity curves during increasing and decreasing temperature, and its electrical conductivity decreased rapidly by desorption of OH- between 20$0^{circ}C$ and 35$0^{circ}C$ when the temperature increased in dry air. The CO gas sensitivity of starchadded ZnO samples was higher than that of ZnO without starch addition. The sensitivity of porous, starchadded ZnO to 200ppm CO gas was much less in humid atmosphere than in dry atmosphere since water vapor increased the conductivity of porous ZnO in air, but decreased the conductivity in CO. Maximum sensitivity to 200 ppm CO gas balanced by air was about 100 in dry atmosphere and about 15 in RH 23% atmosphere. |
| Key words:
ZnO, Electrical conductivity, Gas sensitivity, Humidity effect |
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