標題: Application of m-CNTs/NaClO4/Ppy to a fast response, room working temperature ethanol sensor
作者: Wu, Ren-Jang
Huang, Yu-Ching
Yu, Ming-Ru
Lin, Tzu Hsuan
Hung, Shih-Lin
土木工程學系
Department of Civil Engineering
關鍵字: Polypyrrole;Multiwall carbon nanotubes (m-CNTs);UV-photo polymerization;Ethanol sensor
公開日期: 28-Aug-2008
摘要: A new blended material, m-CNTs/NaClO4/Ppy, was developed as a gas sensor to detect ethanol concentrations at room temperature. The sensing material polypyrrole (Ppy) was synthesized in situ by UV-photo-polymerization. The multiwall carbon nanotubes (m-CNTs) added enhanced the short-term repeatability of the Ppy-sensing material. The relative resistance variation (R-ethanol/R-air) of mCNTs/NaClO4/Ppy was 1.193 when exposed to ethanol of 30,000 ppm. The sensor response and recovery times (both 20s) were very short to this concentration. An unstable baseline of the sensor was explained by theoretical calculation of molecular dynamics made for ethanol adsorption on polypyrrole, which revealed formation of a new bond, N-H center dot center dot center dot O. Adsorption energy decreased with increasing the number of ethanol molecules adsorbed and was 0.8 kcal/mol at eight adsorbed molecules. Sensor responses of three different Ppy samples were measured to ethanol concentrations of 18,000-40,000 ppm. (C) 2008 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.snb.2008.04.033
http://hdl.handle.net/11536/8446
ISSN: 0925-4005
DOI: 10.1016/j.snb.2008.04.033
期刊: SENSORS AND ACTUATORS B-CHEMICAL
Volume: 134
Issue: 1
起始頁: 213
結束頁: 218
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