期刊
ANALYTICA CHIMICA ACTA
卷 739, 期 -, 页码 83-88出版社
ELSEVIER
DOI: 10.1016/j.aca.2012.06.025
关键词
Poly (N-isopropylacrylamide) microgels; Color tunable materials; Quartz crystal microbalance; Stimuli responsive polymers; Sensing
资金
- University of Alberta (the Department of Chemistry)
- Natural Science and Engineering Research Council (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Advanced Education & Technology Small Equipment Grants Program (AET/SEGP)
- University of Alberta (the Faculty of Science)
Poly (N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc) microgel-based etalons have been shown to have visible color and unique spectral properties, which both depend on solution temperature and pH. In this investigation, pNIPAm-co-AAc microgel-based etalons were fabricated on the Au electrode of a quartz crystal microbalance (QCM), and the resonant frequency of the QCM monitored as a function of temperature, at pH 3.0. Furthermore, the resonant frequency at either pH 3.0 or 7.0 was monitored while keeping the solution temperature constant at various temperatures. In all cases, when the solution temperature was below the collapse transition for the microgels (similar to 32 degrees C), the resonant frequency at pH 3.0 was lower than at pH 7.0, which we attribute to the film transitioning from a deswollen to swollen state, respectively. It was observed that the magnitude of the resonant frequency change increased as the solution temperature approached the collapse temperature for the microgels. The overall sensitivity to pH was determined to be 1.3 x 10(-8) M[H+]Hz(-1) and a theoretical detection limit of 390 nM was obtained. This sensitivity will be exploited further for future biosensing applications. (C) 2012 Elsevier B.V. All rights reserved.
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