Probing Elasticity at the Nanoscale: Terahertz Acoustic Vibration of Small Metal Nanoparticles - Archive ouverte HAL Access content directly
Journal Articles Nano Letters Year : 2010

Probing Elasticity at the Nanoscale: Terahertz Acoustic Vibration of Small Metal Nanoparticles

Vincent Juvé
Aurelien Crut
Paolo Maioli
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Natalia del Fatti
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Fabrice Vallée
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Abstract

The acoustic response of surface-controlled metal (Pt) nanoparticles is investigated in the small size range, between 1.3 and 3 nm (i.e., 75-950 atoms), using time-resolved spectroscopy. Acoustic vibration of the nanoparticles is demonstrated, with frequencies ranging from 1.1 to 2.6 THz, opening the way to the development of THz acoustic resonators. The frequencies, measured with a noncontact optical method, are in excellent agreement with the prediction of a macroscopic approach based on the continuous elastic model, together with the bulk material elastic constants. This demonstrates the validity of this model at the nanoscale and the weak impact of size reduction on the elastic properties of a material, even for nanoparticles formed by less than 100 atoms.
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hal-00677045 , version 1 (07-03-2012)

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Vincent Juvé, Aurelien Crut, Paolo Maioli, Michel Pellarin, Michel Broyer, et al.. Probing Elasticity at the Nanoscale: Terahertz Acoustic Vibration of Small Metal Nanoparticles. Nano Letters, 2010, 10 (5), pp.1853-1858. ⟨10.1021/nl100604r⟩. ⟨hal-00677045⟩
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