Title

Fluorescence Lifetime Enhancement Of Organic Chromophores Attached To Gold Nanoparticles

Abstract

We present for the first time experimental evidence of fluorescence lifetime enhancement of organic chromophores attached to metal nanospheres via radiative decay engineering. The hybrid system (HS) was a modified "diconjugated" molecular probe, 4-acetaimdo-4′- maleimidylstilbene-2,2′-dithiol (AMDT), covalently bound to the surface of 5-nm-diameter Au nanospheres by its two sulfur atoms, at a distance d < 1 nm and with its molecular axis parallel to the surface of the nanoparticle surface. We measured a fluorescence lifetime increase of a factor of 2 at room temperature (τ AMDT = (4.32±0.10) ns and τ HS = (8.73±0.23) ns) and a factor of 3.4 at 4.2 K (τ AMDT = (2.64±0.07) ns and τ HS = (7.96±0.14) ns). We also found that the fluorescence quantum yield of this hybrid system is not reduced, proof of a weak energy transfer between the molecular probe and the nanoparticle. These results demonstrate that a molecular dipole oriented parallel to the metal surface tends to be reduced by the coupling with its image. © 2005 American Chemical Society.

Publication Date

5-19-2005

Publication Title

Journal of Physical Chemistry B

Volume

109

Issue

19

Number of Pages

9499-9504

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp050803e

Socpus ID

19944370509 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/19944370509

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