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http://dx.doi.org/10.4313/JKEM.2016.29.5.312

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

Kim, Hyun-Soo (Department of Electrical Engineering, Gachon University)
Lee, Won-Jae (Department of Electronics Engineering, Gachon University)
Park, Yong-Seo (Department of Electrical Engineering, Gachon University)
Jang, Kyung-Uk (Department of Electrical Engineering, Gachon University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.29, no.5, 2016 , pp. 312-316 More about this Journal
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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