Detection of toxic gases using a composite of single-walled carbon nanotubes with polyaniline
by Ran Yoo; Hyang Hee Choi; Seung Hyun Lee; Jin Seo Noh; Wooyoung Lee
International Journal of Nanotechnology (IJNT), Vol. 10, No. 8/9, 2013

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.

Online publication date: Thu, 01-Aug-2013

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