Nano Lett. 2005 Apr;5(4):585-9.

Gold nanoparticles quench fluorescence by phase induced radiative rate suppression.

Dulkeith E, Ringler M, Klar TA, Feldmann J, Muñoz Javier A, Parak WJ.

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Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Germany.

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.

PMID:: 15826091; [PubMed - indexed for MEDLINE]

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