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: | 28-八月-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 |
顯示於類別: | 期刊論文 |