Journal
LUMINESCENCE
Volume 31, Issue 3, Pages 654-659Publisher
WILEY-BLACKWELL
DOI: 10.1002/bio.3007
Keywords
ZnO nanoparticles; caffeic acid; fluorescence quenching; FTIR; TEM; DLS
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The binding of ZnO nanoparticles (NPs) and caffeic acid (CFA) was investigated using fluorescence quenching, UV/vis absorption spectrscopy, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS) at different temperatures. The study results indicated fluorescence quenching between ZnONPs and CFA rationalized in terms of a static quenching mechanism or the formation of non-fluorescent CFA-ZnO. From fluorescence quenching spectral analysis, the binding constant (K-a), number of binding sites (n) and thermodynamic properties were determined. Values of the quenching (K-SV) and binding (K-a) constants decrease with increasing temperature and the number of binding sites n=2. The thermodynamic parameters determined using Van't Hoff equation indicated that binding occurs spontaneously involving the hydrogen bond, and van der Waal's forces played a major role in the reaction of ZnONPs with CFA. The FTIR, TEM and DLS measurements also indicated differences in the structure, morphology and size of CFA, ZnONPs and their corresponding CFA-ZnO. Copyright (c) 2015 John Wiley & Sons, Ltd.
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