Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Light-activated mechanism for metal oxide gas sensors

금속 산화물 가스 센서의 광 활성화 센싱 메커니즘

  • Oum, Wansik (Division of Materials Science and Engineering, Hanyang University) ;
  • Shin, Ka Yoon (Division of Materials Science and Engineering, Hanyang University) ;
  • Yu, Dong Jae (Division of Materials Science and Engineering, Hanyang University) ;
  • Kang, Sukwoo (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Eun Bi (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Hyoun Woo (Division of Materials Science and Engineering, Hanyang University)
  • 엄완식 (한양대학교신소재공학과) ;
  • 신가윤 (한양대학교신소재공학과) ;
  • 유동재 (한양대학교신소재공학과) ;
  • 강석우 (한양대학교신소재공학과) ;
  • 김은비 (한양대학교신소재공학과) ;
  • 김현우 (한양대학교신소재공학과)
  • Received : 2021.10.18
  • Accepted : 2021.10.27
  • Published : 2021.11.30
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Abstract

Light-activated metal oxide gas sensors have been investigated in recent decades. Light illumination enhances the sensing attributes, including the operational temperature, sensitivity, and selectivity. Unfortunately, high operating temperature is a major problem for gas sensors because of the huge energy consumption. Therefore, the importance of light-activated room-temperature sensing has increased. This paper reviews recent light-activated sensors and their sensing mechanisms with a specific focus on metal oxide gas sensors. Studies use the outstanding ZnO and SnO2 sensors to research photoactivation when illuminated by various sources such as ultraviolet (UV), halogen lamp, or monochromatic light. Photon induction generates electron-hole pairs that increase the number of adsorption sites of gas molecules and ions improving the sensor's sensing properties.

Keywords

Acknowledgement

이 논문은 산업통상자원부 제조·공정·물류 산업지능화 산업기술거점센터 (20013726) 연구비 지원으로 수행되었다.

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