Preparation of plasmonic platforms of silver wires on gold mirrors and their application to surface enhanced fluorescence

Tanya Shtoyko, Sangram Raut, Ryan M. Rich, Randy J. Sronce, Rafal Fudala, Rachel N. Mason, Irina Akopova, Zygmunt Gryczynski, Ignacy Gryczynski

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In this report we describe a preparation of silver wires (SWs) on gold mirrors and its application to surface enhanced fluorescence (SEF) using a new methodology. Silica protected gold mirrors were drop-coated with a solution of silver triangular nanoprisms. The triangular nanoprisms were slowly air-dried to get silver wires that self-assembled on the gold mirrors. Fluorescence enhancement was studied using methyl azadioxatriangulenium chloride (Me-ADOTA·Cl) dye in PVA spin-coated on a clean glass coverslip. New Plasmonic Platforms (PPs) were assembled by placing a mirror with SWs in contact with a glass coverslip spin-coated with a uniform Me-ADOTA·Cl film. It was shown that surface enhanced fluorescence is a real phenomenon, not just an enhancement of the fluorescence signal due to an accumulation of the fluorophore on rough nanostructure surfaces. The average fluorescence enhancement was found to be about 15-fold. The lifetime of Me-ADOTA·Cl dye was significantly reduced (∼4 times) in the presence of SWs. Moreover, fluorescence enhancement and lifetime did not show any dependence on the excitation light polarization.

Original languageEnglish
Pages (from-to)18780-18787
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number21
DOIs
StatePublished - 12 Nov 2014

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Keywords

  • fluorescence lifetime imaging
  • metal-enhanced fluorescence
  • photonics
  • plasmonic platform

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