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https://irlib.pccu.edu.tw/handle/987654321/2606
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| Title: | In situ prepared polypyrrole for low humidity QCM sensor and related theoretical calculation |
| Authors: | Sun, Yi-Lu
Wu, Ren-Jang
Huang, Yu-Ching
Su, Pi-Guey
Chavali, Murthy
Chen, Yi-Zhen
Lin, Chu-Chieh |
| Contributors: | 化學系 |
| Keywords: | low humidity sensor
polypyrrole
QCM
photo-polymerization
association constant |
| Date: | 2007 |
| Issue Date: | 2009-11-09 09:43:39 (UTC+8) |
| Abstract: | In situ preparation of polypyrrole (Ppy) by photo-polymerization coated on a quartz crystal microbalance (QCM) as a low humidity sensor was reported. Different concentrations of Ppy films say 0 wt.% (as blank), 0.1, 1, and 10 wt.% were investigated to measure humidity concentrations between 14.7 and 5412.5 ppm(v). The adsorption/desorption behavior was also examined at humidity concentration 510.2 ppm(v). The sensitivities of 0, 0.1 and 1 wt.% Ppy films at 51.5 ppmv were 0. 143, 0.219 and 0.427, respectively. For 1 wt.% Ppy, the highest sensitivity was obtained. The slope and correlation coefficients (R-2) for 1 wt.% Ppy at the ranges of 14.7-898.6 ppm(v) were 0.0646 and 0.9909, respectively. A series of molecular simulations have been carried out to calculate bond energy for the water molecule interaction with Ppy, which was found to be similar to 3 kcal/mol indicating the existence of hydrogen bonding during the sorption process. Based on Langmuir isotherm adsorption assumption, for 0.1 and 1 wt.% Ppy films, the association constants were 2606.30 and 5792.98, respectively. This larger association constant for 1 wt.% Ppy film explains higher sensitivity. (c) 2007 Published by Elsevier B.V. |
| Relation: | TALANTA Volume: 73 Issue: 5 Pages: 857-861 |
| Appears in Collections: | [Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles
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