Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Detection Characterization of NOX Gas Using the MWCNT/ZnO Composite Film Gas Sensors by Heat Treatment

열처리에 따른 MWCNT/ZnO 복합체 필름 가스센서의 NOX 가스 검출 특성

  • Kim, Hyun-Soo (Department of Smart Media, Chungkang College of Cultural Industries) ;
  • Jang, Kyung-Uk (Department of Electrical Engineering, Gachon University)
  • 김현수 (청강문화산업대학교 스마트미디어전공) ;
  • 장경욱 (가천대학교 전기공학과)
  • Received : 2018.08.06
  • Accepted : 2018.08.29
  • Published : 2018.11.01
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Abstract

In particular, gas sensors require characteristics such as high speed, sensitivity, and selectivity. In this study, we fabricated a $NO_X$ gas sensor by using a multi-walled carbon nanotube (MWCNT)/zinc oxide (ZnO) composite film. The fabricated MWCNT/ZnO gas sensor was then treated by a $450^{\circ}C$ temperature process to increase its detection sensitivity for NOx gas. We compared the detection characteristics of a ZnO film gas sensor, MWCNT film gas sensor, and the MWCNT/ZnO composited film gas sensor with and without the heat-treatment process. The fabricated gas sensors were used to detect $NO_X$ gas at different concentrations. The gas sensor absorbed $NO_X$ gas molecules, exhibiting increased sensitivity. The sensitivity of the gas sensor was increased by increasing the gas concentration. Additionally, while changing the temperature inside the chamber for the MWCNT/ZnO composite film gas sensor, we obtained its sensitivity for detecting $NO_X$ gas. Compared with ZnO, the MWCNT film gas sensor is excellent for detecting $NO_X$ gas. From the experimental results, we confirmed the enhanced gas sensor sensing mechanism. The increased effect by electronic interaction between the MWCNT and ZnO films contributes to the improved sensor performance.

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