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Article Dans Une Revue Journal of Physical Chemistry C Année : 2021

Probing Plasmon-Induced Chemical Mechanisms by Free-Radical Nanophotopolymerization

Résumé

Localized surface plasmon-induced photopolymerization of free-radical acrylate monomers is an efficient, smart, and versatile method for preparing metal/polymer hybrid nanoparticles (NPs) with accurate control of the thickness and spatial distribution of the polymer on the NP surface. Despite a growing number of practical demonstrations, the mechanism leading to polymerization of the acrylate monomer by localized surface plasmon resonance (LSPR) is still controversial. It could be related to either a photochemical mechanism enhanced by electromagnetic hot spots (enhanced near field) or thermoplasmonic (photothermal heating) or electrochemical (via hot-carrier injection) mechanisms, as proposed in different studies. After developing a high-resolution characterization method based on transmission electron microscopy and by tuning the photopolymer composition and the irradiation conditions, the LSPR-induced physicochemical mechanism is revealed. We demonstrate that the photochemical pathway is the main mechanism under the mild irradiation conditions chosen for this process. In a more general way, photopolymerization proves to be a powerful tool to investigate the coupling between metal nanostructures and organic moieties.

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hal-03205875 , version 1 (22-04-2021)

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Farid Kameche, Wajdi Heni, Siham Telitel, Loïc Vidal, Sylvie Marguet, et al.. Probing Plasmon-Induced Chemical Mechanisms by Free-Radical Nanophotopolymerization. Journal of Physical Chemistry C, 2021, 125 (16), pp.8719-8731. ⟨10.1021/acs.jpcc.1c01693⟩. ⟨hal-03205875⟩
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