Journal
NANOTECHNOLOGY
Volume 24, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/24/2/025503
Keywords
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Funding
- National Science Foundation [CMMI-0856753, ECCS-1001039]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1001039] Funding Source: National Science Foundation
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We demonstrate a practical sensing platform, consisting of SnO2 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 similar to 2 s for 100 ppm CO detection. The lower detection limit was similar to 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.
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