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http://dx.doi.org/10.4313/JKEM.2018.31.3.188

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

Son, Ju-Hyung (Department of Electrical Engineering, Gachon University)
Kim, Hyun-Soo (Department of Electrical 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.31, no.3, 2018 , pp. 188-192 More about this Journal
Abstract
In this study, we fabricated an $NO_X$ gas sensor using a composite film of multi-walled carbon nanotubes (MWCNT)/zinc oxide (ZnO). Carbon nanotubes (CNTs) show good electronic conductivity and chemical-stability, and zinc oxide (ZnO) is a wide band gap semiconductor with a large exciton binding energy. Gas sensors require characteristics such as high speed, sensitivity, and selectivity. The fabricated gas sensor was used to detect $NO_X$ gas at different $NO_X$ concentrations. The sensitivity of the gas sensor increased with increasing gas concentrations. Additionally, while changing the temperature inside the chamber containing the MWCNT/ZnO gas sensor, we obtained the sensitivity and normalized responses for detecting $NO_X$ gas in comparison to ZnO and MWCNT film gas sensors. From the experimental results, we confirmed that the gas sensor sensing mechanism was enhanced in the composite-film gas-sensor and that the electronic interaction between MWCNT and ZnO contributed to the improved sensor performance.
Keywords
Multi-walled carbon nanotube; Zinc oxide; Detection mechanism; MWCNT/ZnO composite film gas sensor;
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