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주석산화물 가스 센서의 유사화학작용제에 대한 반응 특성 원문보기

  • 저자

    이우석

  • 학위수여기관

    慶北大學校

  • 학위구분

    국내석사

  • 학과

    화학공학과 화학공학전공

  • 지도교수

  • 발행년도

    2005

  • 총페이지

    vi, 71 p.

  • 키워드

    주석산화물 가스센서;유사화학작용제;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10063757&outLink=K  

  • 초록

    A semiconductor gas sensor based on tin oxide was studied at a low concentration range of chemical agent simulants such as acetonitrile, DMMP, DPM and dichloromethane from 0.02 ppm to 0.8 ppm at 350℃. The sensing properties of tin oxide sensors such as sensitivity, response, recovery and reproducibility were investigated by using a flow measuring system. The sensitivities of the tin oxide sensors linearly increased with the concentration of simulants below 0.8 ppm. For acetonitrile and dichloromethane, P-SnO2 sensor prepared by precipitated tin oxide powder was more sensitive than C-SnO2 sensor prepared by commercial tin oxide powder. While, in the cases of DMMP and DPM, the sensitivities of C-SnO2 sensor were higher than those of P-SnO2 sensor. These difference in sensitivity of the sensors were closely related to the physical properties such as particle size, surface area, and pore size of the tin oxide powders in addition to the molecular sizes of the detecting gas. The recovery of the sensitivity of the sensor seemed to be possible for acetonitrile and DPM. However, in the cases of DMMP and dichloromethane, the complete recovery of the sensors was impossible. Comparing with the C-SnO2 sensor, the new tin oxide based sensors promoted with molybdenum oxide and antimony oxide showed an improved recovery ability to the DMMP and they were completely recovered after detection, although their recovery rate was slow. Other tin oxide based sensors promoted with various metal oxides for improving the sensitivity were not recovered. Their sensitivities and recoveries depend on the amount of the molybdenum oxide and antimony oxide.


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