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Proceedings Paper

Fluorescence enhancement using silver-gold nanocomposite substrates
Author(s): Sharmistha Dutta Choudhury; Ramachandram Badugu; Krishanu Ray; Prasanna Sai Vanam; Joseph R. Lakowicz
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Paper Abstract

Metal-enhanced fluorescence (MEF) is a newly emerging phenomenon in which the near-field interactions of fluorophores with the plasmons in metallic nanostructures can lead to substantial fluorescence enhancements. In the present study, we have investigated the use of silver-gold nanocomposite (Ag-Au-NC) structures, prepared by the galvanic replacement reaction of silver with gold, as plasmonic substrates for MEF. We have observed significant enhancement in the fluorescence intensities and decrease in the fluorescence lifetimes of two commonly used dyes, ATTO655 and Cy5, using the fabricated Ag-Au-NC substrates. Interestingly, the fluorescence enhancement depends on the amount of residual silver present in the substrates after the galvanic replacement reaction. Our results show that the galvanic replacement reaction is a very facile and powerful route to prepare Ag-Au-NC substrates that can be suitable for various MEF based applications.

Paper Details

Date Published: 6 February 2012
PDF: 8 pages
Proc. SPIE 8234, Plasmonics in Biology and Medicine IX, 82340B (6 February 2012); doi: 10.1117/12.924603
Show Author Affiliations
Sharmistha Dutta Choudhury, Univ. of Maryland at Baltimore (United States)
Ramachandram Badugu, Univ. of Maryland at Baltimore (United States)
Krishanu Ray, Univ. of Maryland at Baltimore (United States)
Prasanna Sai Vanam, Univ. of Maryland at Baltimore (United States)
Joseph R. Lakowicz, Univ. of Maryland at Baltimore (United States)

Published in SPIE Proceedings Vol. 8234:
Plasmonics in Biology and Medicine IX
Tuan Vo-Dinh; Joseph R. Lakowicz, Editor(s)

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