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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Transparent plasmonic nanocontainers protect organic fluorophores against photobleaching
Nano Letters, Volume 11, No. 5, Year 2011
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Description
Numerous research efforts are investigating the possibility of using light interactions with metallic nanoparticles to improve the fluorescence properties of nearby molecules. Few investigations have considered the encapsulation of molecules in metallic nanocavities. In this paper, we present the optical properties of new hybrid nanoparticles consisting of gold nanoshells and fluorescent organic dyes in their liquid cores. Microspectroscopy on single nanoparticle demonstrates that the extinction spectra are in good agreement with Mie's theory. Finite difference time domain (FDTD) calculations reveal that excitation and emission radiations are efficiently transmitted through the thin gold nanoshells. Thus, they can be considered as transparent plasmonic nanocontainers for photoactive cores. In agreement with FDTD calculations, measurements show that fluorophores encapsulated in gold nanoshells keep their brightness, but they show fluorescence lifetimes 1 order of magnitude shorter. As a salient consequence, the photoresistance of encapsulated organic dyes is also improved by an order of magnitude. This unusual ultraviolet photoresistance results from the reduced probability of triplet-singlet conversion that eventually exposes dyes to singlet oxygen photodegradation. © 2011 American Chemical Society.
Authors & Co-Authors
Zaiba, Soraya
France, Grenoble
Laboratoire Interdisciplinaire de Physique
Algeria, Algiers
Université Des Sciences et de la Technologie Houari Boumediene
Algeria, Boumerdes
Université de Boumerdes
Lerouge, Frédéric
France, Lyon
École Normale Supérieure de Lyon
Craciun, Ana Maria
France, Grenoble
Laboratoire Interdisciplinaire de Physique
Romania, Cluj Napoca
Universitatea Babeș-bolyai
Focsan, Monica
France, Grenoble
Laboratoire Interdisciplinaire de Physique
Romania, Cluj Napoca
Universitatea Babeș-bolyai
Lermé, Jean L.
France, Villeurbanne
Université Claude Bernard Lyon 1
Gallavardin, Thibault
France, Lyon
École Normale Supérieure de Lyon
Maury, Olivier
France, Lyon
École Normale Supérieure de Lyon
Andraud, Chantal
France, Lyon
École Normale Supérieure de Lyon
Parola, Stephane
France, Lyon
École Normale Supérieure de Lyon
Baldeck, Patrice Lilian
France, Grenoble
Laboratoire Interdisciplinaire de Physique
Statistics
Citations: 53
Authors: 10
Affiliations: 6
Identifiers
Doi:
10.1021/nl2004847
ISSN:
15306984
e-ISSN:
15306992
Research Areas
Environmental