Gold nanoparticles quench fluorescence by phase induced radiative rate suppression.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 15826091.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
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.
Medical subject headings
- Carbocyanines
- DNA, Single-Stranded
- Fluorescent Dyes
- Gold
- Nanostructures