Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Design of Highly Reliable Thick Film Gas Sensor Using SnO2 Nanofibers

SnO2 나노섬유를 이용한 고신뢰성 후막 가스센서 설계

  • Jung, Jin Wook (Department of Materials Science and Engineering, Korea University) ;
  • Park, Sang Jin (Department of Materials Science and Engineering, Korea University) ;
  • Jeong, In Bong (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Bo-Young (Department of Materials Science and Engineering, Korea University) ;
  • Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
  • 정진욱 (고려대학교 공과대학 신소재공학부) ;
  • 박상진 (고려대학교 공과대학 신소재공학부) ;
  • 정인봉 (고려대학교 공과대학 신소재공학부) ;
  • 김보영 (고려대학교 공과대학 신소재공학부) ;
  • 이종흔 (고려대학교 공과대학 신소재공학부)
  • Received : 2016.07.14
  • Accepted : 2016.07.27
  • Published : 2016.07.31
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Abstract

The reliability and reproducibility of gas sensors are very important for real applications. The influence of nanofiber length and sensing film thickness on the reliability and response of gas sensing characteristics was investigated. For this, the length of $SnO_2$ nanofibers was controlled by tuning ultrasonic treatment and the different thicknesses of sensing films were prepared by manipulating the amount of slurry deposition. The sensor prepared from long nanofibers (length: ${\sim}3.6{\mu}m$) showed the significant fluctuation of gas sensing characteristics when the film becomes thinner than $18{\mu}m$, while that prepared from short nanofibers (length: ${\sim}0.9{\mu}m$) showed reproducible sensor response and resistance regardless of film thickness. Moreover, the shortening of nanofibers enhanced the gas response ~2 times, which can be explained by the increase of chemiresistive fiber-to-fiber contacts. The reproducibility, gas response, and selectivity of $SnO_2$ nanofiber gas sensor could be controlled by tuning nanofiber length, film thickness, and catalyst loading.

Keywords

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