POIY(L-lactide) stabilized gold nanoparticles based QCM sensor for low humidity detection

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题名:	POIY(L-lactide) stabilized gold nanoparticles based QCM sensor for low humidity detection
作者:	Sun, Yi-Lu Chen, Yi-Zhen Wu, Ren-Jang Chavali, Murthy Huang, Yu-Ching Su, Pi-Guey Lin, Chu-Chieh
贡献者:	化學系
关键词:	low humidity sensor poly(L-lactide) gold nanoparticles QCM association constant
日期:	2007
上传时间:	2009-11-09 10:01:24 (UTC+8)
摘要:	A quartz crystal (QC) microbalance coated with poly(L-lactide) stabilized gold nanoparticles (PLLA-Au-NP) was reported as a low humidity sensor. Enhancement of humidity sensitivity due to the high surface area of gold nanoparticles was demonstrated by comparison with those of a bulk gold electrode (blank) and a PLLA-coated film. These electrodes were investigated to measure the humidity between 275 and 2408 ppm(v),. The adsorption/desorption behavior was also examined at a humidity of 1163 ppm,. The sensitivities of the blank, PLLA and PLLA-Au-NP films were 0.090, 0.052 and 0.886 Hz/ppm(v), respectively, at a humidity level of 319 ppm, indicating the highest sensitivity of the PLLA-Au-NP film. In the plot between sensor response (frequency shift) of the PLLA-Au-NP film and humidity in the range of 275-847 ppmv, a nearly linear slope (sensitivity) of 0.480 Hz/ppmv was obtained with a correlation coefficient (R-2) of 0.9769. Based on the Langmuir adsorption isotherm assumption, the association constants of water vapor molecules with the blank, PLLA and PLLA-Au-NP films were estimated to be 11263.42, 7870.98 and 13354.68, respectively, thus explaining the relatively high sensitivity of PLLA-Au-NP film with the larger association constant. (C) 2007 Elsevier B.V. All rights reserved.
關聯:	SENSORS AND ACTUATORS B-CHEMICAL Volume: 126 Issue: 2 Pages: 441-446
显示于类别:	[化學系所] 期刊論文

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