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Nanotechnology. 2013 Jan 18;24(2):025503. doi: 10.1088/0957-4484/24/2/025503. Epub 2012 Dec 13.

Highly sensitive room temperature carbon monoxide detection using SnO2 nanoparticle-decorated semiconducting single-walled carbon nanotubes.

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Department of Mechanical Engineering, University of Wisconsin, Milwaukee, 3200 North Cramer Street, Milwaukee, WI 53211, USA.


We demonstrate a practical sensing platform, consisting of SnO(2) nanoparticle-decorated semiconducting single-walled carbon nanotubes assembled on gold electrodes via a dielectrophoretic process, for highly sensitive CO detection with fast response at room temperature. The highest sensitivity obtained was 0.27 and the response time was ∼2 s for 100 ppm CO detection. The lower detection limit was ∼1 ppm. These results indicate that the sensing performance of our device is among the best of CO sensors implemented with SWNTs. Further, we observed a significant increase in sensitivity to 0.67 after subjecting the device to an electrical breakdown at 8 V. We also proposed a theoretical model to reveal the relationship between the sensitivity and the gas concentration. The new model not only resulted in a nice fit to our data, but also allowed us to estimate the contact resistance between an individual SWNT and the gold electrodes.

[Indexed for MEDLINE]

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