Gas sensing properties of defect-induced single-walled carbon nanotubes

We report a method to induce defects on the surface of single-walled carbon nanotubes (SWNTs) in order to improve the gas-sensing properties of an SWNT-based sensor. In this approach, the surface of the SWNTs is physically modified by thermal treatment at high temperature. The fabricated SWNT-based...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-06, Vol.228, p.688-692
Main Authors: Kim, Jaeseong, Choi, Sun-Woo, Lee, Je-Haeng, Chung, Youngchul, Byun, Young Tae
Format: Article
Language:English
Subjects:
Actuators
Annealing
Defect functionalization
Defects
Gas sensors
Heat treatment
Nitrogen dioxide
NO2 gas
Sensors
Single wall carbon nanotubes
Single-walled carbon nanotubes
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Summary:We report a method to induce defects on the surface of single-walled carbon nanotubes (SWNTs) in order to improve the gas-sensing properties of an SWNT-based sensor. In this approach, the surface of the SWNTs is physically modified by thermal treatment at high temperature. The fabricated SWNT-based sensors were subjected to rapid thermal annealing (RTA) over the temperature range of 300–800°C. After the thermal treatment, the electrical resistances of the defect-induced SWNT sensors were measured and compared with those of pristine SWNT sensors. The gas sensing properties of the defect-induced SWNT sensors upon exposure to various gases such as NO2, NH3, and H2 were measured at room temperature. The thermally treated SWNT-based sensors exhibited much higher sensitivity and recovery than the pristine sensors. These results indicate that the defect-induced SWNTs can improve the performance of SWNT-based sensors.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.01.094