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Superquenching of coumarin 153 by gold nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
27008 43993 2012 7 PDF Available
Title
Superquenching of coumarin 153 by gold nanoparticles
Abstract

Superquenching of the laser dye, coumarin 153 (C153), by 16–59 nm gold nanoparticles (AuNPs) is reported from the steady state and time-resolved fluorometric investigations. Quenching of the steady state fluorescence of C153 and its fluorescence lifetime reveals energy transfer from the probe to AuNP in the photoexcited state. The Stern–Volmer constants (KSV, 107–109 mol−1 dm3) determined from the quenching of the donor lifetime in the presence of AuNPs of varying sizes are orders of magnitude higher than those for the normal photochemical quenching processes. The quenching efficiency increases with an increase in the size of the nanoparticles. The importance of the work lies in providing a new and simple system to be exploited for developing biosensor with high degree of sensitivity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Super-efficient quenching of C153 by AuNPs of varying dimensions demonstrated. ► Stern–Volmer constant values are orders higher than the normal quenching processes. ► Quenching efficiency increases with an increase in the particle size of the AuNPs. ► Efficient energy transfer and intense absorption of AuNPs impart superquenching.

Keywords
Gold nanoparticle; Coumarin 153; Quenching efficiency; Energy transfer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 242, 15 August 2012, Pages 44–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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