Metal-enhanced fluorescence using aggregated silver nanoparticles

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• 作者：Bihua Xia ; Fang He ; Lidong Li
• 关键词：Fluorescence ; Self-assembly ; Nanoparticles ; Silver ; Aggregation ; Metal-enhanced fluorescence
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：5 March, 2014
• 年：2014
• 卷：444
• 期：Complete
• 页码：9-14
• 全文大小：2091 K

文摘

A simple strategy to prepare aggregated Ag nanoparticle composites in solution by self-assembly is developed. Sodium citrate is used as the reduction agent to produce negatively charged Ag nanoparticles which are then aggregated using cationic polyacrylamide (PAM) to form self-assembled Ag-PAM microcomposites. In these microcomposites, the degree of aggregation of Ag nanoparticles can be controlled by changing the Ag/PAM ratio. This special structural feature can be applied in the study of metal-enhanced fluorescence. Confocal laser scanning microscopy and time-resolved fluorescence measurements are used to examine the fluorescence enhancement phenomenon of the Ag-PAM microcomposites. The microcomposites considerably enhanced the fluorescence intensity of fluorescein isothiocyanate isomer (FITC).