Sensing properties of polyethylenimine coated carbon nanotubes in oxidized oil

Vincent Lau Chun Fai, Yang Doo Lee, Kyongsoo Lee, Keun Soo Lee, Dae Jin Ham, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)463-468
Number of pages6
Issue number1
Publication statusPublished - 2011 Jul 15

Bibliographical note

Funding Information:
This research was supported by Seoul Metropolitan Government through Seoul Research and Business Development (grant no. PA090685 ).


  • Carbon nanotube
  • Chemical sensor
  • Oxidized oil
  • Polyethylenimine

ASJC Scopus subject areas

  • Analytical Chemistry


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