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基于改性表面增强拉曼散射(SERS)基底的金属增强荧光寿命成像与光谱分析

Metal-Enhanced Fluorescence Lifetime Imaging and Spectroscopy on a Modified SERS Substrate.

作者信息

Ray Krishanu, Lakowicz Joseph R

机构信息

Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 West Lombard Street, Baltimore, MD, 21201, USA.

出版信息

J Phys Chem C Nanomater Interfaces. 2013 Aug 1;117(30). doi: 10.1021/jp404590j.

Abstract

In this paper, we developed a metal-enhanced fluorescence (MEF) substrate by modification of the commercially available surface enhanced Raman spectroscopy (SERS) substrate that may meet the reproducibility and sensitivity challenge of MEF. In spite of many studies and interest on MEF from a number of research groups, application to real-world situations and its commercial use remain challenging mainly due to the difficulties in fabricating reproducible MEF substrates. Specifically, one of the challenges is achieving a standardized MEF substrate for reproducible fluorescence intensity enhancement and/or changes in lifetime. The gold standard klarite substrates for SERS were coated with a thin layer of silver nanoparticles for MEF studies. To test the newly developed MEF substrates, a monolayer of streptavidin conjugated Alexa-647 was assembled on biotinylated-glass or MEF substrates. We observed over 50-fold increase in the fluorescence intensity from a monolayer of streptavidin conjugated Alexa-647 on the biotinylated MEF substrate compared to the same on glass substrate. A significant reduction in the lifetime and increased photostability of Alexa-647 on MEF substrate was observed. Fluorescence lifetime imaging was performed on the monolayer of dye assembled on the modified SERS substrates. We expect this study will serve as a platform to encourage the future use of a standardized MEF substrate for a plethora of sensing applications.

摘要

在本文中,我们通过对市售表面增强拉曼光谱(SERS)底物进行改性,开发出一种金属增强荧光(MEF)底物,其可能满足MEF的重现性和灵敏度挑战。尽管许多研究小组对MEF进行了大量研究并颇感兴趣,但由于制造可重现的MEF底物存在困难,将其应用于实际情况及其商业用途仍然具有挑战性。具体而言,挑战之一是获得用于可重现荧光强度增强和/或寿命变化的标准化MEF底物。用于SERS的金标准klarite底物涂有一层用于MEF研究的银纳米颗粒薄层。为了测试新开发的MEF底物,在生物素化玻璃或MEF底物上组装了单层链霉亲和素偶联的Alexa-647。我们观察到,与在玻璃底物上相比,生物素化MEF底物上单层链霉亲和素偶联的Alexa-647的荧光强度增加了50倍以上。观察到Alexa-647在MEF底物上的寿命显著缩短且光稳定性增强。对组装在改性SERS底物上的染料单层进行了荧光寿命成像。我们期望这项研究将成为一个平台,鼓励未来将标准化的MEF底物用于大量传感应用。

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