银粒子的表面修饰及荧光表面增强效应  

Fluorescence Surface-Enhancement Effect of Ag-SiO_2 Core-Shell Nanoparticles

作　　者：庄严[1] 周群[1] 李晓伟[1] 董文明[1] 郑军伟[1] 

机构地区：[1]苏州大学化学化工学院,苏州市十梓街1号215006

出　　处：《光谱实验室》2005年第4期881-884,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：国家自然科学基金资助项目(No.20073028;20473056)

摘　　要：采用表面化学修饰制备了Ag-SiO2核-壳纳米粒子,发现SiO2包裹壳层形状随其厚度而改变,包裹初期SiO2壳层依托银核的形状生长,随着壳层厚度增加则趋于热力学稳定的球状。银纳米粒子的表面等离子体共振可由SiO2包裹壳层厚度调变,银核吸收谱峰随壳层厚度增大而红移。Ag-SiO2核-壳纳米粒子可极大增强罗丹明6G的荧光强度,且表面增强效应与壳层的厚度密切相关。Ag-SiO2 core-shell nanoparticles were prepared by surface modification of silver nanoparticles. It was found that the shape of the shell varied with its thickness. In the early stage, the SiO2 shell grows according to the shape of the silver particles, then tends to grow into a thermodynamic stable geometry. The surface plasmon resonance of the silver core can be altered by the thickness of the SiO2 shell, which shows a red shift of the absorption band of the silver core with increasing of the shell thickness. The fluorescence of Rhodamine 6G is largely enhanced in the presence of the Ag-SiO2 nanoparticles, largely depending on the thickness of the SiO2 shell.

关 键 词：表面增强荧光光谱 纳米粒子 核-壳结构 罗丹明6G 

分 类 号：O657.39[理学—分析化学] O657.32[理学—化学]