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Issue 19, 2017
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Environmental effects on the natural vibrations of nanoplatelets: a high pressure study

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Abstract

Resonant acoustic modes from ultrathin CdS colloidal nanoplatelets (NPLs) are probed under high pressure using low frequency Raman spectroscopy. In particular we focus on the characterization of the recently evidenced mass load effect that is responsible for a significant downshift of the NPL breathing frequency due to the inert mass of organic ligands. We show that a key parameter in the observation of the mass effect is whether the surrounding medium is able to support THz acoustic wave propagation, at a frequency close to that of the inorganic vibrating core. At low pressures, surface organic molecules show a single particle-like behavior and a strong mass effect is observed. Upon pressure loading the ligands are compacted together with the surrounding medium and slowly turned into a solid medium that supports THz acoustic phonons. We observe a continuous transition towards a fully embedded NPL with a frequency close to that of a freely vibrating slab and a progressive loss of the mass effect. The quality factor of the detected vibration significantly decreases as a result of the appearance of a “phonon-like” behavior of the environment at the origin of damping and energy dissipation.

Graphical abstract: Environmental effects on the natural vibrations of nanoplatelets: a high pressure study

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Publication details

The article was received on 31 Jan 2017, accepted on 11 Apr 2017 and first published on 12 Apr 2017


Article type: Paper
DOI: 10.1039/C7NR00731K
Citation: Nanoscale, 2017,9, 6551-6557
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    Environmental effects on the natural vibrations of nanoplatelets: a high pressure study

    A. Girard, J. Margueritat, L. Saviot, D. Machon, B. Mahler, M. D. Tessier, S. Pedetti, B. Dubertret, H. Géhan, E. Jeanneau, R. Vera and A. Mermet, Nanoscale, 2017, 9, 6551
    DOI: 10.1039/C7NR00731K

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