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Gas sensing properties of single-wall carbon nanotubes dispersed with dimethylformamide

Authors
Lee, KyongsooLee, Jin-WooDong, Ki-YoungJu, Byeong-Kwon
Issue Date
10-12월-2008
Publisher
ELSEVIER SCIENCE SA
Keywords
Carbon nanotube; Nitrogen dioxide; Gas sensor; Dimethylformamide
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.135, no.1, pp.214 - 218
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
135
Number
1
Start Page
214
End Page
218
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/122227
DOI
10.1016/j.snb.2008.08.031
ISSN
0925-4005
Abstract
For NO2 gas sensing, we deposited single-walled carbon nanotubes (SWCNTs) on a pair of interdigitated electrodes (IDEs) by using a simple casting method. In order to achieve well-dispersed SWCNTs, we dispersed the as-grown SWCNT powder into dimethylformamide (DMF). We selected DMF as one of the candidate materials to ravel the entangled SWCNT bundles because the amide group could easily attach to the surface of the nanotubes. The resultant SWCNTs were well separated. However, the SWCNTs dispersed in DMF required a heat treatment to eliminate the DMF molecules adsorbed on the surface of the SWCNTs. Therefore, we heated the SWCNTs on the IDEs to 350 degrees C for 1, 2, 3, and 5 h, to remove the outer DMF adsorbed layers. The assembled sensors were exposed to NO2 of 3 and 10 ppm concentrations. We attributed the NO2 gas sensing to the direct charge transfer from the physically adsorbed molecules to the individual p-type semiconducting SWCNTs. (c) 2008 Published by Elsevier B.V.
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