Gold nanoparticles quench fluorescence by phase induced radiative rate suppression
Gold nanoparticles quench fluorescence by phase induced radiative rate suppression
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DOI：
10.1021/nl0480969
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发表时间：
2005-04-01
期刊：
影响因子：
10.8
通讯作者：
Parak, WJ
中科院分区：
文献类型：
--
作者：
Dulkeith, E;Ringler, M;Parak, WJ
通过ssDNA间隔物连接到金纳米颗粒的Cy 5分子的荧光量子产率被测量为Cy 5-纳米颗粒距离在2和16 nm之间。每个纳米颗粒不同数量的ssDNA允许微调距离。辐射和非辐射分子衰变率随距离的变化，确定使用时间分辨光致发光光谱。值得注意的是，距离依赖的量子效率几乎完全由辐射率决定。
The fluorescence quantum yield of Cy5 molecules attached to gold nanoparticles via ssDNA spacers is measured for Cy5-nanoparticle distances between 2 and 16 nm. Different numbers of ssDNA per nanoparticle allow to fine-tune the distance. The change of the radiative and nonradiative molecular decay rates with distance is determined using time-resolved photoluminescence spectroscopy. Remarkably, the distance dependent quantum efficiency is almost exclusively governed by the radiative rate.