Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Gas Sensing Characteristics of $SnO_{2}$ added with $TiO_{2},\;Pd,\;Pt$ and in for Trimethylamine Gas

Trimethylamine Gas 측정을 위한 $TiO_{2},\;Pd,\;Pt$ 및 In이 첨가된 $SnO_{2}$가스 센서의 특성

  • Lee, Chang-Seop (Department of Chemistry Keimyung University) ;
  • Jung, Soon-Boon (Department of Chemistry Keimyung University) ;
  • Jun, Jae-Mok (Department of Chemistry Keimyung University) ;
  • Lee, In-Sun (Department of Food Processing Keimyung University) ;
  • Lee, Hyeong-Rag (Department of Physics, Kyungpook National University) ;
  • Park, Young-Ho (Department of Fire & Disaster Prevention Engineering, Jinjuinternational University) ;
  • Choi, Sung-Woo (Department of Environment Science Keimyung University)
  • Published : 2007.03.31
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Abstract

This study investigates the use of $TiO_{2},\;Pd,\;Pt$, and In which greatly improves a sensitivity to trimethylamine gas. The metal-$SnO_{2}$ thick films were prepared by screen-printing method onto $Al_{2}O_{3}$ substrates with platinum electrode. The sensing characteristics were investigated by measuring the electrical resistance of each sensor in a test box as a function of detecting gas concentration. This was then used to detect trimethylamine, dimethylamine, and ammonia vapours within the concentration range of 100-1000ppm. The gas sensing properties of metal-$SnO_{2}$ mixed thick films depended on the content and variety of metal. It was found that sensitivity and selectivity of the films dopped with 1 wt% Pd and 10 wt% $TiO_{2}$ for trimethylamin gas showed the best result at $250^{\circ}C$.

[ $TiO_{2},\;Pd,\;Pt$ ]와 In을 사용하여 trimethylamine gas에 대한 감도를 향상시키는 $SnO_{2}$ 가스센서에 대하여 연구하였다. 금속-$SnO_{2}$ 후막은 백금전극이 내장된 알루미나 지지체에 스크린 법으로 제작하였다. 센서의 특성은 검출가스 농도의 함수로서 반응기내 각 센서의 전기적 저항을 측정하여 조사하였으며, $100{\sim}1000ppm$범위의 trimethylamine, dimethylamine과 암모니아가스에 대하여 측정하였다. 그 결과, 금속-$SnO_{2}$의 가스 검출특성은 금속의 종류와 양에 따라 결정되었으며, $250^{\circ}C$에서 trimethylamine에 대한 센서의 감도와 선택성은 1 wt%, Pd와 10 wt%, $TiO_{2}$를 첨가하였을 때 감도가 가장 우수한 것으로 나타났다.

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