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• W3178806148 abstract "Abstract Plasmonic nanostructures, of which gold nanoparticles are the most elementary example, owe their unique properties to localized surface plasmons (LSP), the modes of free electron oscillation. LSP alter significantly electromagnetic field in the nanostructure neighborhood (i.e., near-field), which can modify the electric dipole transition rates in organic emitters. This study aims at investigating the influence of Au@SiO 2 core–shell nanoparticles on the photophysics of porphyrins covalently attached to the nanoparticles surface. Guided by theoretical predictions, three sets of gold nanoparticles of different sizes were coated with a silica layer of similar thickness. The outer silica surface was functionalized with either free-base meso -tetraphenylporphyrin or its zinc complex. Absorption and emission bands of porphyrin overlap in energy with a gold nanoparticle LSP resonance that provides the field enhancement. Silica separates the emitters from the gold surface, while the gold core size tunes the energy of the LSP resonance. The signatures of weak-coupling regime have been observed. Apart from modified emission profiles and shortened S 1 lifetimes, Q band part intensity of the excitation spectra significantly increased with respect to the Soret band. The results were explained using classical transfer matrix simulations and electronic states kinetics, taking into account the photophysical properties of each chromophore. The calculations could reasonably well predict and explain the experimental outcomes. The discrepancies between the two were discussed." @default.
• W3178806148 created "2021-07-19" @default.
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• W3178806148 date "2021-08-04" @default.
• W3178806148 modified "2023-10-18" @default.
• W3178806148 title "Spectral and photophysical modifications of porphyrins attached to core–shell nanoparticles. Theory and experiment" @default.
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• W3178806148 doi "https://doi.org/10.1088/2050-6120/ac1400" @default.
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• W3178806148 hasPublicationYear "2021" @default.
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