Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Xylene Sensor Using Cr-doped Cr-Co3O4 Nanoparticles Prepared by Flame Spray Pyrolysis

화염 분무 열분해법으로 합성된 Cr-Co3O4 나노입자 자일렌 가스센서

  • Jeong, Seong-Yong (Department of Materials Science and Engineering, Korea University) ;
  • Jo, Young-Moo (Department of Materials Science and Engineering, Korea University) ;
  • Kang, Yun Chan (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • 정성용 (고려대학교 신소재공학부) ;
  • 조영무 (고려대학교 신소재공학부) ;
  • 강윤찬 (고려대학교 신소재공학부) ;
  • 이종흔 (고려대학교 신소재공학부)
  • Received : 2020.03.24
  • Accepted : 2020.03.28
  • Published : 2020.03.31
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Abstract

Xylene is a hazardous volatile organic compound that should be precisely measured to monitor indoor air quality. However, the selective and sensitive detection of ppm-level xylene using oxide-semiconductor gas sensors remains a challenge. In this study, pure and Cr-doped Co3O4 nanoparticles (NPs) were prepared using flame spray pyrolysis, and their gas-sensing characteristics to 5-ppm xylene at 250 ℃ were investigated. The 4 at% Cr-doped Co3O4 NPs exhibited a high gas response to 5-ppm xylene (resistance ratio to gas and air = 39.1) and negligible cross-responses to other representative and ubiquitous indoor pollutants such as ethanol, benzene, formaldehyde, carbon monoxide, and ammonia. In this paper, the enhancement of the gas response and selectivity of Co3O4 NPs to xylene by Cr doping was discussed in relation to the catalytic promotion of the gas-sensing reaction. This sensor can be used to monitor indoor xylene.

Keywords

References

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