The mass load effect on the resonant acoustic frequencies of colloidal semiconductor nanoplatelets

Resonant acoustic modes of ultrathin CdS and CdSe colloidal nanoplatelets (NPLs) with varying thicknesses were probed using low frequency Raman scattering. The spectra are dominated by an intense band ascribed to the thickness breathing mode of the 2D nanostructures. The measured Raman frequencies s...

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Bibliographic Details
Published in:Nanoscale 2016-07, Vol.8 (27), p.13251-13256
Main Authors: Girard, Adrien, Saviot, Lucien, Pedetti, Silvia, Tessier, Mickaël D, Margueritat, Jérémie, Gehan, Hélène, Mahler, Benoit, Dubertret, Benoit, Mermet, Alain
Format: Article
Language:English
Subjects:
Cadmium selenides
Chemical Sciences
Colloids
Deviation
Ligands
Loads (forces)
Material chemistry
Nanostructure
Optics
Physics
Raman scattering
Semiconductors
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Summary:Resonant acoustic modes of ultrathin CdS and CdSe colloidal nanoplatelets (NPLs) with varying thicknesses were probed using low frequency Raman scattering. The spectra are dominated by an intense band ascribed to the thickness breathing mode of the 2D nanostructures. The measured Raman frequencies show strong deviations with respect to the values expected for simple bare plates, all the more so as the thickness is reduced. The deviation is shown to arise from the additional mass of the organic ligands that are bound to the free surfaces of the nanoplatelets. The calculated eigen frequencies of vibrating platelets weighed down by the mass of the organic ligands are in very good agreement with the observed experimental behaviours. This finding opens up a new possibility of nanomechanical sensing such as nanobalances. Downshift of nanoplatelets resonance frequencies due to ligand mass loads.
ISSN:2040-3364
2040-3372
DOI:10.1039/c5nr07383a