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Article Dans Une Revue Journal of Physical Chemistry C Année : 2013

Tuning the optical coupling between molecular dyes and metal nanoparticles by the templated silica mineralization of J-aggregates

Erik Dujardin

Résumé

Supramolecular porphyrin aggregates are used as a template for the higher-order assembly of fluorophore–dielectric–metal hybrid nanostructures in which the optical properties of the molecules are modulated by the finely tuned coupling to localized plasmons. First, J-aggregates are encapsulated inside a dielectric silica shell of well-controlled thickness, which reinforces mechanically the template and serves as a precise optical coupling spacer. The silicified J-aggregates are then decorated with gold or silver nanoparticles. UV–visible and fluorescence spectroscopies show that the presence of metal nanoparticles induces a marked enhancement of the J-aggregate fluorescence when the silica thickness is tuned to 7–12 nm, whereas a significant quenching is measured when the dielectric thickness is sub-2 nm. Interestingly, the enhancement is maximized when oxidized silver nanoparticles are placed very close to the J-aggregates.

Domaines

Chimie
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Dates et versions

hal-01798014 , version 1 (23-05-2018)

Identifiants

Citer

Kargal L. Gurunatha, Erik Dujardin. Tuning the optical coupling between molecular dyes and metal nanoparticles by the templated silica mineralization of J-aggregates. Journal of Physical Chemistry C, 2013, 117 (7), pp.3489-3496. ⟨10.1021/jp311911f⟩. ⟨hal-01798014⟩
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