Plasmonic bipyramids for fluorescence enhancement and protection against photobleaching

A great number of studies focus their interest on the photophysical properties of fluorescent hybrid gold nanoparticles for potential applications in biotechnologies such as imaging and/or treatment. Spherical gold nanoparticles are known to quench a chromophore fluorescent signal, when moieties are...

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Bibliographic Details
Published in:Nanoscale 2014-01, Vol.6 (1), p.5138-5145
Main Authors: Navarro, J. R. G, Lerouge, F, Micouin, G, Cepraga, C, Favier, A, Charreyre, M. T, Blanchard, N. P, Lermé, J, Chaput, F, Focsan, M, Kamada, K, Baldeck, P. L, Parola, S
Format: Article
Language:English
Subjects:
Anisotropy
Chemical Sciences
Dyes
Electric fields
Fluorescence
Gold
Material chemistry
Nanoparticles
Nanostructure
Recovery
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Summary:A great number of studies focus their interest on the photophysical properties of fluorescent hybrid gold nanoparticles for potential applications in biotechnologies such as imaging and/or treatment. Spherical gold nanoparticles are known to quench a chromophore fluorescent signal, when moieties are located in their close vicinity. The use of a polymer spacer on such a system allowed only partial recovery of the dye emission by controlling the surface to dye distance. Gold-based anisotropic sharp nanostructures appear to exhibit more interesting features due to the strong electric field generated at their edges and tips. In this paper, a complete study of hybrid fluorescent bipyramidal-like gold nanostructures is presented. We describe the chemical synthesis of gold bipyramids functionalized with fluorescent water-soluble polymers and their photophysics both in solution and on a single object. We show that the use of a bipyramidal shape instead of a spherical one leads to total recovery of the fluorescence and even to an enhancement of the emission of the dyes by a factor of 1.4. Gold nanobipyramids functionalized with luminescent water-soluble polymers exhibit good fluorescence enhancement and high photostability.
ISSN:2040-3364
2040-3372
DOI:10.1039/c3nr06425e