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Proceedings Paper

Enhanced chemical fluorescence-based sensing using metallic nano-composites
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Paper Abstract

It has been recently shown that the favorable effects of enhanced fluorescent intensities, reduced lifetimes (increased probe photostabilities), enhanced and localized rates of multiphoton excitation, and modified rates of energy transfer can occur for fluorophores or biological species of interest, in close proximity to noble metallic nano-structures and surfaces. Subsequently, nano-metal-enhanced fluorescence (NanoMEF) is yielding enormous opportunities for enhanced fluorescence sensing and imaging in microfluidics, lab-on-a-chip, clinical diagnostics, and cellular applications. NanoMEF is a through-space phenomenon relying on interaction of fluorophores with metallic nanoparticles in the presence of excitation light. MEF can be utilized to produce nanometer-size sensors, which display enhanced spectral properties, whie still potentially maintaining a probes free space-sensing functionalities. In this presentation we report our recent findings on the effects of silver nano-particles on the spectral properties of two representative fluorescent probes for pH and Ca2+ measurements. We demonstrate that quantum efficiencies of probes are greatly enhanced providing more reliable chemical sensing capabilities. Our findings promise a new class of potential sensors, which we believe could constitute a new breed of composite nanosensors based on metal-enhanced fluorescence and their applications in miniaturized systems.

Paper Details

Date Published: 1 July 2004
PDF: 10 pages
Proc. SPIE 5318, Advanced Biomedical and Clinical Diagnostic Systems II, (1 July 2004); doi: 10.1117/12.536415
Show Author Affiliations
Henryk Szmacinski, Microcosm, Inc. (United States)
Vincent Pugh, Microcosm, Inc. (United States)
Wayne E. Moore, Microcosm, Inc. (United States)
Chris D. Geddes, Univ. of Maryland Biotechnology Institute (United States)
Univ. of Maryland School of Medicine (United States)
Kadir Aslan, Univ. of Maryland Biotechnology Institute (United States)
Joseph R. Lakowicz, Univ. of Maryland School of Medicine (United States)

Published in SPIE Proceedings Vol. 5318:
Advanced Biomedical and Clinical Diagnostic Systems II
Gerald E. Cohn; Warren S. Grundfest; David A. Benaron; Tuan Vo-Dinh, Editor(s)

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