Room temperature methane detection using palladium loaded single-walled carbon nanotube sensors

Single-walled carbon nanotubes (SWNTs) loaded with palladium (Pd) nanoparticles are used for detection of methane ranging from 6 to 100 ppm in air at room temperature. The Pd-SWNT nanosensors show advantages over conventional catalytic beads and metal oxide sensors for methane detection in terms of...

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Bibliographic Details
Published in:Chemical physics letters 2004-06, Vol.391 (4), p.344-348
Main Authors: Lu, Yijiang, Li, Jing, Han, Jie, Ng, H.-T., Binder, Christie, Partridge, Christina, Meyyappan, M.
Format: Article
Language:English
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Summary:Single-walled carbon nanotubes (SWNTs) loaded with palladium (Pd) nanoparticles are used for detection of methane ranging from 6 to 100 ppm in air at room temperature. The Pd-SWNT nanosensors show advantages over conventional catalytic beads and metal oxide sensors for methane detection in terms of reduced size and power consumption by a factor of 100 and sensitivity by a factor of 10. A charge transfer sensing mechanism in which Pd attracts electrons from SWNTs to form a weakly bound complex Pd δ+(CH 4) δ− is discussed. In addition, the elevated temperature and ultraviolet light effects on the sensor characteristics are also studied.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2004.05.029