Title: Detection of toxic gases using a composite of single-walled carbon nanotubes with polyaniline

Authors: Ran Yoo; Hyang Hee Choi; Seung Hyun Lee; Jin Seo Noh; Wooyoung Lee

Addresses: Department of Material Science and Engineering, Yonsei University, Nano Device Lab, 134 Shinchon, Seoul 120-749, Korea ' Department of Material Science and Engineering, Yonsei University, Nano Device Lab, 134 Shinchon, Seoul 120-749, Korea ' Department of Material Science and Engineering, Yonsei University, Nano Device Lab, 134 Shinchon, Seoul 120-749, Korea ' Department of Nano-Physics, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701 Korea ' Department of Nano-Physics, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-si, Gyeonggi-do, 461-701 Korea

Abstract: We reported on the response behaviours of a composite sensor of SWNTs with polyaniline to detect noxious gases at room temperature. The SWNT-polyaniline composite synthesised was found to be high-quality with good uniformity. A combination of photolithography and a lift-off process was utilised to fabricate 100-nm thick Pd electrodes on drop-cast SWNT-polyaniline composite. The composite-based sensor showed high sensitivities to NH₃ concentration of 35 ppm and CO concentration of 50 ppm at room temperature. The observed sensitivity was 4% and −5.5% for the respective gas species in air. These results indicate that SWNT-polyaniline composite sensors employing Pd electrodes can be a good candidate for a noxious gas sensor that is able to simultaneously detect multiple gases in different modes down to minimal concentrations at room temperature.

Keywords: gas detection; toxic gases; single-walled carbon nanotubes; SWNTs; polyaniline; CO; NH3; ammonia; carbon monoxide; gas sensors; nanotechnology; composite sensors; noxious gases.

DOI: 10.1504/IJNT.2013.054215

International Journal of Nanotechnology, 2013 Vol.10 No.8/9, pp.749 - 755

Published online: 01 Aug 2013 *

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