Nano Archive

Reduction of self-quenching in fluorescent silica-coated silver nanoparticles

Viger, Mathieu L. and Live, Ludovic S. and Therrien, Olivier D. and Boudreau, Denis (2008) Reduction of self-quenching in fluorescent silica-coated silver nanoparticles. PLASMONICS, 3 (1). pp. 33-40. ISSN 1557-1955 (Print) 1557-1963 (Online)

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Official URL: http://www.springerlink.com/content/a8t713t8tw5061...

Abstract

This paper reports the development of spherical Ag@SiO2 nanocomposites in which fluorescein isothiocyanate molecules have been incorporated using a silane coupling agent and a straightforward microemulsion-based synthesis procedure. The photophysical characteristics of core-shell and coreless nanostructures with similar silica shell thickness and fluorophore densities are measured and compared, and show unequivocally that the presence of the silver core decreases the fluorophore lifetime by a factor as high as 4 and that the steady-state fluorescence intensity is increased by a factor as high as 3. The relationship between the enhancement in fluorescence yield and the influence of the silver core on resonance energy transfer processes was examined by fluorescence lifetime and anisotropy measurements. These Ag@SiO2 core-shell nanoparticles provide higher detectability and lower self-quenching, whereas the faster recycling time offers more robustness toward photobleaching.

Item Type:Article
Uncontrolled Keywords:self-quenching; fluorescence; core-shell; nanoshell; metal-enhanced
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanofabrication processes and tools
Physical Science > Photonics
ID Code:1496
Deposited By:Farnush Anwar
Deposited On:11 Dec 2008 20:01
Last Modified:11 Dec 2008 20:01

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