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Journal of Nanomaterials
Volume 2013, Article ID 184345, 6 pages
Research Article

Improvement of NO Gas Sensing Properties of Polyaniline/MWCNT Composite by Photocatalytic Effect of TiO2

1Research and Education Center of Carbon Resources, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
2Department of Fine Chemical Engineering and Applied Chemistry, BK21-E2M, Chungnam National University, Daejeon 305-764, Republic of Korea

Received 1 August 2013; Accepted 3 September 2013

Academic Editor: Ji Sun Im

Copyright © 2013 Jumi Yun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The highly sensitive and rapid NO gas sensor was prepared with polyaniline/TiO2/carbon nanotube composites. Aniline was polymerized on the surface of carbon nanotube (p-type semiconductor) with embedding TiO2. The gas sensing property was measured by the changes of electrical resistance without or with UV irradiation to investigate the photodegradation of NO by TiO2. The photo-degraded products such as HNO2, NO2, and HNO3, which were adsorbed on the PANi-coated carbon nanotubes, resulted in the decreased electrical resistance in the p-type semiconductors of carbon nanotube and polyaniline. The advantages of TiO2 photocatalyst in gas sensing were apparent in the improvement in both sensitivity and response rate.