Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Catalytic combustion type hydrogen gas sensor using TiO2 and UV LED

TiO2 광촉매와 UV LED를 이용한 접촉연소식 수소센서

  • Hong, Dae-Ung (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Han, Chi-Hwan (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research) ;
  • Han, Sang-Do (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research) ;
  • Gwak, Ji-Hye (Photo- & Electro-Materials Research Center, Korea Institute of Energy Research) ;
  • Lee, Sang-Yeol (Department of Electrical and Electronic Engineering, Yonsei University)
  • 홍대웅 (연세대학교 전기전자공학부) ;
  • 한치환 (한국에너지기술연구원 광.전기소재연구센터) ;
  • 한상도 (한국에너지기술연구원 광.전기소재연구센터) ;
  • 곽지혜 (한국에너지기술연구원 광.전기소재연구센터) ;
  • 이상렬 (연세대학교 전기전자공학부)
  • Published : 2007.01.31
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Abstract

A thick film catalytic gas sensors which can be operated at $142^{\circ}C$ in presence of ultra violet-light emitting diode has been developed to measure hydrogen concentration in 0-5 % range. The sensing material as a combustion catalyst consists of $TiO_{2}$ (5 wt%) and Pd/Pt (20 wt%) supported on $Al_{2}O_{3}$ powder and the reference material to compensate the heat capacity of it in a bridge circuit was an catalyst free $Al_{2}O_{3}$ powder. Platinum heater and sensor materials were formed on the alumina plate by screen printing method and heat treatment. The effect of UV radiation in the presence of photo catalyst $TiO_{2}$ on the sensor sensitivity, response and recovery time has been investigated. The reduction of operating temperature from $192^{\circ}C$ to $142^{\circ}C$ for hydrogen gas sensing property in presence of UV radiation is attributed to the hydroxy radical and superoxide which was formed at the surface of $TiO_{2}$ under UV radiation.

Keywords

References

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