Increasing the Enhancement Factor in Plasmon-Enhanced Fluorescence with Shell-Isolated Nanoparticles

Three central experimental variables are looked at to increase the observed enhancement factor in plasmon-enhanced fluorescence: nanoparticle size, nanoparticle aggregation, and the sample temperature. The rise in emission intensity is demonstrated here in carefully chosen experimental conditions. F...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2016-09, Vol.120 (37), p.20530-20535
Main Authors: Camacho, S. A, Aoki, P. H. B, Albella, P, Oliveira, Osvaldo N, Constantino, C. J. L, Aroca, R. F
Format: Article
Language:English
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Summary:Three central experimental variables are looked at to increase the observed enhancement factor in plasmon-enhanced fluorescence: nanoparticle size, nanoparticle aggregation, and the sample temperature. The rise in emission intensity is demonstrated here in carefully chosen experimental conditions. First, it is shown that shell-isolated nanoparticles of gold (Au-SHINs) with a core of 100 nm produce a higher enhancement factor than smaller Au-SHINs (with a core of 40 nm) in solution and on Langmuir–Blodgett (LB) films. The enhancement factor is further increased by aggregation of the Au-SHINs in solution, and the findings are supported by finite-difference time-domain (FDTD) computations. Second, the enhancement factor (110-fold) of plasmon-enhanced fluorescence achieved with large Au-SHINs on an LB film of eosin decyl ester (EOSDEC) increases dramatically at low temperatures (170 fold). High enhancement factors are underpinned by a close matching of the plasmon extinction and fluorescence emission.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.5b09215