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Sensing properties of polyethylenimine coated carbon nanotubes in oxidized oil

Authors
Fai, Vincent Lau ChunLee, Yang DooLee, KyongsooLee, Keun-SooHam, Dae-JinJu, Byeong-Kwon
Issue Date
15-7월-2011
Publisher
ELSEVIER SCIENCE BV
Keywords
Carbon nanotube; Polyethylenimine; Oxidized oil; Chemical sensor
Citation
TALANTA, v.85, no.1, pp.463 - 468
Indexed
SCIE
SCOPUS
Journal Title
TALANTA
Volume
85
Number
1
Start Page
463
End Page
468
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/111980
DOI
10.1016/j.talanta.2011.04.006
ISSN
0039-9140
Abstract
Chemical detection is still a continuous challenge when it comes to designing single-walled carbon nanotube (SWCNT) sensors with high selectivity, especially in complex chemical environments. A perfect example of such an environment would be in thermally oxidized soybean oil. At elevated temperatures, oil oxidizes through a series of chemical reactions that results in the formation of monoacylglycerols, diacylglycerols, oxidized triacylglycerols, dimers, trimers, polymers, free fatty acids, ketones, aldehydes, alcohols, esters, and other minor products. In order to detect the rancidity of oxidized soybean oil, carbon nanotube chemiresistor sensors have been coated with polyethylenimine (PEI) to enhance the sensitivity and selectivity. PEI functionalized SWCNTs are known to have a high selectivity towards strong electron withdrawing molecules. The sensors were very responsive to different oil oxidation levels and furthermore, displayed a rapid recovery of more than 90% in ambient air without the need of heating or UV exposure. (C) 2011 Elsevier B.V. All rights reserved.
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공과대학 (전기전자공학부)
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