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The Analysis of NOx Gas Detection Characteristics for the Gas Sensor Using the MWCNT/ZnO Composites Film

MWCNT/ZnO 복합체 필름을 이용한 가스센서의 NOx가스 검출 특성 분석

Kim, Hyun-Soo;Lee, Won-Jae;Park, Yong-Seo;Jang, Kyung-Uk
김현수;이원재;박용서;장경욱

  • Received : 2016.04.06
  • Accepted : 2016.04.15
  • Published : 2016.05.01

Abstract

In this study, we fabricated $NO_x$ gas sensor by using multi-walled carbon nanotubes(MWCNT)/zinc oxide(ZnO) composite film. Carbon nanotubes (CNTs) have good electronic, chemical-stability, and sensitivity characteristics. And zinc oxide (ZnO) is a wide band gap and large exciton binding energy semiconductor. In particular, gas sensors require characteristics such as high speed, sensitivity, and selectivity. The fabricated gas sensor was used to detect $NO_x$ gas for different values of the $NO_x$ gas concentrations. The gas sensor that absorbed$NO_x$ gas molecules showed a increasing in resistance. The sensitivity of the gas sensor was increased by increasing the gas concentrations. Additionally, while changing the temperature inside the chamber for the MWCNT/ZnO composite film gas sensor, we obtained the sensitivity. And the comparison analysis to ZnO film gas sensor for detecting $NO_x$ gas. From the experiment result, we confirmed improvement of $NO_x$ gas detection characteristics using the MWCNT/ZnO composite film.

Keywords

Multi-walled carbon nanotube;Zinc oxide;MWCNT/ZnO composite film gas sensor;Sensitivity;$NO_x$ gas

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