光学仪器, 2019, 41 (3): 61, 网络出版: 2019-09-02  

二氧化硅包覆对纳米多孔金增强荧光特性的调制

Tuning of the fluorescence enhancement of nanoporous gold by silica coating
作者单位
上海理工大学光电信息与计算机工程学院, 上海 200093
摘要
为了减弱金属基底对表面增强荧光的淬灭效应, 设计了增强效果更好的荧光增强基底。采用化学生长二氧化硅的方法对纳米多孔金 (NPG)表面进行修饰, 避免荧光分子和 NPG表面直接接触引起的淬灭效应, 在 SiO2@NPG表面分别组装上罗丹明 6G(R6G)和辐射中心波长为 700 nm的量子点 (QD 700)。通过探测分析荧光光谱, 可以得出: 二氧化硅包覆的基底可以使表面增强荧光得到显著的增强, 并且二氧化硅厚度对荧光强度有调节作用; 在基底增强量子点荧光信号的同时, 量子点和 NPG之间还出现非辐射的能量转移现象, 二氧化硅的厚度对能量转移同样有调节作用, 厚度约为 5 nm时能量转移现象最显著。本实验为基于荧光能量转移的检测以及设计更好的荧光增强基底提供了参考。
Abstract
In order to weaken the quenching effect of the metal substrate on surface enhanced fluorescence, a better fluorescent enhanced substrate was designed. In this experiment, the surface of nanoporous gold (NPG) was modified by chemical synthesis of silica, avoiding quenching effects caused by direct contact of fluorescent molecules with NPG surfaces. Rhodamine 6G (R6G) and a quantum dot with a center wavelength of 700 nm (QD 700) were assembled on the surface of SiO2@NPG respectively. The analysis of the corresponding fluorescence spectra shows that coating silica can make the surface enhanced fluorescence enhanced significantly, and the thickness of the silica has a regulatory effect on the fluorescent signal. As for quantum dots (QD), unless fluorescence enhancement of assembled QD, non-radiative energy transfer between the excited QD and NPG was observed with silica coated NPG, and the energy transfer reaches the strongest when the thickness of silica was 5 nm. The experiment provides a new method for detection based on fluorescence energy transfer.

马超, 张玲. 二氧化硅包覆对纳米多孔金增强荧光特性的调制[J]. 光学仪器, 2019, 41(3): 61. MA Chao, ZHANG Ling. Tuning of the fluorescence enhancement of nanoporous gold by silica coating[J]. Optical Instruments, 2019, 41(3): 61.

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