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The gas sensing properties of single-walled carbon nanotubes deposited on an aminosilane monolayer

Authors
Tran, Thu HongLee, Jin-WooLee, KyongsooLee, Yang DooJu, Byeong-Kwon
Issue Date
29-1월-2008
Publisher
ELSEVIER SCIENCE SA
Keywords
single-walled carbon nanotubes (SWCNTs); nitrogen dioxide (NO2); self-assembled monolayer (SAM); gas sensor; electron donation
Citation
SENSORS AND ACTUATORS B-CHEMICAL, v.129, no.1, pp.67 - 71
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS B-CHEMICAL
Volume
129
Number
1
Start Page
67
End Page
71
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/124208
DOI
10.1016/j.snb.2007.07.104
ISSN
0925-4005
Abstract
This paper presents our study on the effects of an antinosilane monolayer on the gas sensing properties of single-walled carbon nanotubes (SWCNTs). A gas sensor for nitrogen dioxide (NO2) detection was fabricated by conventional photolithography process on an oxidized silicon wafer functionalized with 3-aminopropyltriethoxysilane (APTES). Such a CNT-based gas sensor was found to result in high sensitivity and fast response time compared with the sensor fabricated on a non-silanised surface. The amine groups in the APTES monolayer, electron donating in nature, played a role of charge transfer to the semiconducting SWCNTs, and hence the amount of electrons transferred from SWCNTs to NO2 molecules increased. Our results suggest that the APTES intended originally for selective placement of individual SWCNTs could be used to enhance the gas sensing properties of the SWCNTs. (C) 2007 Elsevier B.V. All rights reserved.
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공과대학 (전기전자공학부)
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