Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance upgrade on Thursday 4th of May 2017 from 8.00am to 9.00am (BST).

During this time our websites will be offline temporarily. If you have any questions please use the feedback button on this page. We apologise for any inconvenience this might cause and thank you for your patience.



Environment effect on the natural vibrations of nanoplatelets: a high pressure study

Abstract

Resonant acoustic modes from ultrathin CdS colloidal nanoplates (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 [Girard et al Nanoscale, 2016, 8, 13251-13256] that is responsible for a significant downshift of the NPLs breathing frequency due to the inert mass of the 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 and slowly turn 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.

Back to tab navigation
Please wait while Download options loads

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, Accepted Manuscript
  •   Request permissions

    Environment effect on the natural vibrations of nanoplatelets: a high pressure study

    A. Girard, J. Margueritat, L. SAVIOT, D. Machon, B. Mahler, M. Tessier, S. Pedetti, B. Dubertret, H. Gehan, E. Jeanneau, R. VERA and A. Mermet, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR00731K

Search articles by author