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標題: In situ prepared polypyrrole for low humidity QCM sensor and related theoretical calculation
作者: Sun, Y.L.
Wu, R.J.
Huang, Y.C.
Su, P.G.
Chavali, M.
Chen, Y.Z.
Lin, C.C.
關鍵字: low humidity sensor;polypyrrole;QCM;photo-polymerization;association;constant;quartz-crystal microbalance;polymer solar-cells;composite-material;conducting polymers;gas sensors;films
Project: Talanta
期刊/報告no:: Talanta, Volume 73, Issue 5, Page(s) 857-861.
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.
ISSN: 0039-9140
DOI: 10.1016/j.talanta.2007.05.002
Appears in Collections:化學系所

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