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Journal Articles Nano Letters Year : 2011

Acoustic Vibrations of Metal-Dielectric Core-Shell Nanoparticles

Denis Mongin
  • Function : Author
  • PersonId : 902249
Vincent Juvé
Paolo Maioli
Aurélien Crut
Natalia del Fatti
  • Function : Author
  • PersonId : 865435
Fabrice Vallée
  • Function : Author
  • PersonId : 902251

Abstract

The acoustic vibrations of metal nanoparticles encapsulated in a dielectric shell (Ag@SiO2) were investigated using a time-resolved femtosecond technique. The measured vibration periods significantly differ from those predicted for the bare metal cores and, depending on the relative core and shell sizes, were found to be either larger or smaller than them. These results show that the vibration of the whole core-shell particle is excited and detected. Moreover, vibrational periods are in excellent agreement with the predictions of a model based on continuum thermoelasticity. However, such agreement is obtained only if a good mechanical contact of the metal and dielectric parts of the core-shell particle is assumed, providing a unique way to probe this contact in multimaterial or hybrid nano-objects.
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Dates and versions

hal-00676435 , version 1 (05-03-2012)

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Denis Mongin, Vincent Juvé, Paolo Maioli, Aurélien Crut, Natalia del Fatti, et al.. Acoustic Vibrations of Metal-Dielectric Core-Shell Nanoparticles. Nano Letters, 2011, 11 (7), pp.3016-3021. ⟨10.1021/nl201672k⟩. ⟨hal-00676435⟩
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