Gold Nanoparticles Quench Fluorescence by Phase Induced Radiative Rate Suppression
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- 23 February 2005
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (4) , 585-589
- https://doi.org/10.1021/nl0480969
Abstract
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.Keywords
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