Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Bimetallic Zeolitic Imidazolate Framework Derived Co3O4/CoFe2O4 Catalyst Loaded In2O3 Nanofibers for Highly Sensitive and Selective Ethanol Sensing

금속-유기 골격체 열분해를 통해 합성된 Co3O4/CoFe2O4 첨가 In2O3나노섬유를 이용한 고감도 고선택성 에탄올 센서

  • Lee, Soo-Min (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Tae-Hyun (Department of Materials Science and Engineering, Korea University) ;
  • Jo, Young-Moo (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Ki Beom (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • 이수민 (고려대학교 신소재공학부) ;
  • 김태현 (고려대학교 신소재공학부) ;
  • 조영무 (고려대학교 신소재공학부) ;
  • 김기범 (고려대학교 신소재공학부) ;
  • 이종흔 (고려대학교 신소재공학부)
  • Received : 2021.03.16
  • Accepted : 2021.03.23
  • Published : 2021.03.31
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Abstract

In this study, pure and Co3O4/CoFe2O4-loaded Indium oxide (In2O3) nanofibers were synthesized by the electrospinning of an Indium/Polyvinylpyrrolidone precursor solution containing cobalt and iron bimetallic zeolitic imidazolate frameworks and subsequent heat treatment. The ethanol, toluene, p-xylene, benzene, carbon monodxide, and hydrogen gas sensing characteristics of the solution were measured at 250-400 ℃. 0.5 at%-Co3O4/CoFe2O4-loaded In2O3 nanofibers exhibited extreme response (resistance ratio - 1) to 5 ppm of ethanol (210.5) at 250 ℃ and excellent selectivity over the interfering gases. In contrast, pure In2O3 nanofibers exhibited relatively low responses to all the analyte gases and low selectivity above 250-400 ℃. The superior response and selectivity toward ethanol is explained by the catalytic roles of Co3O4 and CoFe2O4 in gas sensing reaction and the electronic sensitization induced by the formation of p (Co3O4/CoFe2O4)-n (In2O3) junctions.

Keywords

References

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