title: Sensing properties of polyethylenimine coated carbon nanotubes in oxidized oil.
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.
authors.affiliation: Display and Nanosystem Laboratory, College of Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea.
authors.forename: Vincent Lau Chun
authors.initials: VL
authors.lastname: Fai
authors.forename: Yang Doo
authors.initials: YD
authors.lastname: Lee
authors.forename: Kyongsoo
authors.initials: K
authors.lastname: Lee
authors.forename: Keun-Soo
authors.initials: KS
authors.lastname: Lee
authors.forename: Dae-Jin
authors.initials: DJ
authors.lastname: Ham
authors.forename: Byeong-Kwon
authors.initials: BK
authors.lastname: Ju
mesh_terms: D005513:Food Inspection / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009821:Oils / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011094:Polyethyleneimine; D011786:Quality Control; D013024:Soybean Oil / Q000737:chemistry
chemical_list: D037742:Nanotubes, Carbon; D009821:Oils; D013024:Soybean Oil; D011094:Polyethyleneimine; D010100:Oxygen