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Open Access Nano Express

Noxious gas detection using carbon nanotubes with Pd nanoparticles

Hyang Hee Choi1, Junmin Lee1, Ki-Young Dong2, Byeong-Kwon Ju2 and Wooyoung Lee1*

Author Affiliations

1 Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, South Korea

2 Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul, 136-713, South Korea

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Nanoscale Research Letters 2011, 6:605  doi:10.1186/1556-276X-6-605

Published: 24 November 2011

Abstract

Noxious gas sensors were fabricated using carbon nanotubes [CNTs] with palladium nanoparticles [Pd NPs]. An increase in the resistance was observed under ammonia for both CNTs and CNT-Pd sensors. Under carbon monoxide [CO], the two sensors exhibited different behaviors: for CNT sensors, their resistance decreased slightly with CO exposure, whereas CNT-Pd sensors showed an increase in resistance. The sensing properties and effect of Pd NPs were demonstrated, and CNT-Pd sensors with good repeatability and fast responses over a range of concentrations may be used as a simple and effective noxious gas sensor at room temperature.