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| HAL : hal-00529667, version 1 |
| DOI : 10.1021/jp9044572 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Physical Chemistry C 113, 41 (2009) 17669-17677 |
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| How Gold Particles Suppress Concentration Quenching of Fluorophores Encapsulated in Silica Beads |
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Matteo Martini 1Pascal Perriat 1 |
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| (01/09/2009) |
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| Increasing the luminescence of silica particles encapsulating fluorescein by increasing fluorescein concentration is a promising strategy which is unfortunately limited by the phenomenon of self-quenching. In this paper, we demonstrate that this quenching can be almost entirely suppressed by the presence of gold inclusions within silica. Precisely, in core(gold)/shell(polysiloxane) particles incorporating fluorescein molecules, the quantum yield attains 80% of that of isolated fluorescein for an interdye distance of 3 nm whereas it is less than 15% in the absence of gold. From systematic measurements of quantum yield and lifetime, we proved that, contrary to all literature expectations, the reduction of self-quenching does not originate from the enhancement of the radiative decay rate but from a dramatic decrease of the nonradiative one: the presence of metal inclusions impeding energy transfers to fluorescein H-type dimers that act as traps for light. |
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| 1 : | Matériaux, ingénierie et sciences (MATEIS) |
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CNRS : UMR5510 – Institut National des Sciences Appliquées (INSA) - Lyon |
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| 2 : | Physics Department |
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University of Trento |
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| 3 : | Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM) |
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CNRS : UMR8531 – École normale supérieure de Cachan - ENS Cachan |
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| 4 : | Laboratoire de Physico-Chimie des Matériaux Luminescents (LPCML) |
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CNRS : UMR5620 – Université Claude Bernard - Lyon I |
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| Domaine | : | Chimie/Chimie théorique et/ou physique |
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| plasmon – spaser – fluorescence lifetime – energy transfer |
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| hal-00529667, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00529667 | |
| oai:hal.archives-ouvertes.fr:hal-00529667 | |
| Contributeur : Robert Bernard Pansu | |
| Soumis le : Mardi 26 Octobre 2010, 11:57:29 | |
| Dernière modification le : Mardi 26 Octobre 2010, 11:57:29 | |
