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標題: POIY(L-lactide) stabilized gold nanoparticles based QCM sensor for low humidity detection
作者: Sun, Y.L.
Chen, Y.Z.
Wu, R.J.
Chavali, M.
Huang, Y.C.
Su, P.G.
Lin, C.C.
關鍵字: low humidity sensor
gold nanoparticles
association constant
quartz-crystal microbalance
期刊/報告no:: Sensors and Actuators B-Chemical, Volume 126, Issue 2, Page(s) 441-446.
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.
ISSN: 0925-4005
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