1,4 - 二甲氧基 - 2,3 - 二甲基蒽 - 9,10 - 二酮在等离子体银纳米颗粒上的光谱研究
Spectroscopic studies of 1,4-dimethoxy-2,3-dimethylanthracene-9,10-dione on plasmonic silver nanoparticles.
作者信息
Kavitha S R, Umadevi M, Vanelle P, Terme T, Khoumeri O, Sridhar B
机构信息
Department of Physics, Mother Teresa Women's University, Kodaikanal 624 101, Tamil Nadu, India.
Department of Physics, Mother Teresa Women's University, Kodaikanal 624 101, Tamil Nadu, India.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Dec 10;133:472-9. doi: 10.1016/j.saa.2014.06.007. Epub 2014 Jun 14.
Silver nanoparticles (Ag NPs) of different sizes from 7nm to 22nm have been prepared by simple Dirk and Charles chemical method and characterized using UV-vis spectroscopy and high resolution transmission electron microscopy (HRTEM). Fluorescence quenching of 1,4-dimethoxy-2,3-dimethylanthracene-9,10-dione (DMDMAD) by silver nanoparticles has been investigated by fluorescence spectroscopy to understand the role of quenching mechanism. Furthermore, the intensity of DMDMAD fluorescence emission peak decreases with decrease in the size of the Ag NPs. The fluorescence quenching rate constant and association constant for above system were determined using Stern-Volmer and Benesi-Hildebrand plots. The mechanism of DMDMAD fluorescence quenched by Ag NPs was discussed according to the Stern-Volmer equation. It has been observed that the quenching due to Ag NPs proceeds via dynamic quenching process. The distance between DMDMAD (donor) to Ag NPs (acceptor) and the critical energy transfer distance were estimated based on the Förster Resonance Energy Transfer (FRET) theory.
通过简单的德克和查尔斯化学方法制备了尺寸从7纳米到22纳米不等的银纳米颗粒（Ag NPs），并使用紫外可见光谱和高分辨率透射电子显微镜（HRTEM）对其进行了表征。通过荧光光谱研究了银纳米颗粒对1,4 - 二甲氧基 - 2,3 - 二甲基蒽 - 9,10 - 二酮（DMDMAD）的荧光猝灭，以了解猝灭机制的作用。此外，DMDMAD荧光发射峰的强度随着Ag NPs尺寸的减小而降低。使用斯特恩 - 沃尔默和贝内西 - 希尔德布兰德图确定了上述体系的荧光猝灭速率常数和缔合常数。根据斯特恩 - 沃尔默方程讨论了Ag NPs猝灭DMDMAD荧光的机制。已经观察到，Ag NPs引起的猝灭是通过动态猝灭过程进行的。基于福斯特共振能量转移（FRET）理论估计了DMDMAD（供体）到Ag NPs（受体）之间的距离以及临界能量转移距离。
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