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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2022

Surface Plasmon Tunability of Core-Shell Au@Mo(6) Nanoparticles by Shell Thickness Modification

Résumé

Plasmon resonances of noble metal nanoparticles are used to enhance light-matter interactions in the nanoworld. The nanoparticles’ optical response depends strongly on the dielectric permittivity of the surrounding medium. We show that the plasmon resonance energy of core-shell Au@Mo(6) nanoparticles can be tuned from 2.4 to 1.6 eV by varying the thickness of their Mo(6) cluster shells between zero and 70 nm, when the core diameter is fixed at 100 nm. We probe their plasmonic response by performing nanometer-resolution plasmon mapping on individual nanoparticles, using electron energy-loss spectroscopy inside a transmission electron microscope. Our experimental results are corroborated by numerical simulations performed using boundary element methods. The simulations predict a similar dependency for the extinction energy, showing that this effect could also be observed by light-optical experiments outside the electron microscope, although limited by the size distribution of the nanoparticles in solution and the substantial scattering effects.

Domaines

Chimie
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Dates et versions

hal-03594187 , version 1 (02-03-2022)

Identifiants

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Flavien Sciortino, Ovidiu Cretu, Vasilios Karanikolas, Fabien Grasset, Stéphane Cordier, et al.. Surface Plasmon Tunability of Core-Shell Au@Mo(6) Nanoparticles by Shell Thickness Modification. Journal of Physical Chemistry Letters, 2022, 13 (9), pp.2150-2157. ⟨10.1021/acs.jpclett.1c03853⟩. ⟨hal-03594187⟩
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