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Journal Articles Nanoscale Year : 2014

Plasmonic bipyramids for fluorescence enhancement and protection against photobleaching

Abstract

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.
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Dates and versions

hal-01984809 , version 1 (17-01-2019)

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J. Navarro, F. Lerouge, G. Micouin, C. Cepraga, A. Favier, et al.. Plasmonic bipyramids for fluorescence enhancement and protection against photobleaching. Nanoscale, 2014, 6 (10), pp.5138. ⟨10.1039/c3nr06425e⟩. ⟨hal-01984809⟩
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