Size dependence of acoustic and optical vibrational modes of CdSe nanocrystals in glasses

The size dependence of resonant Raman scattering from acoustic and optical vibrational modes in CdSe nanocrystals (size less than 10 nm) embedded in a glassy matrix has been investigated. In the low-frequency Raman scattering range (< 100 cm −1) a fine structure due to the confinement of acoustic...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1996-05, Vol.197 (2), p.238-246
Main Authors: Saviot, L., Champagnon, B., Duval, E., Kudriavtsev, I.A., Ekimov, A.I.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Phonon states and bands, normal modes, and phonon dispersion
Phonons and vibrations in crystal lattices
Physics
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Summary:The size dependence of resonant Raman scattering from acoustic and optical vibrational modes in CdSe nanocrystals (size less than 10 nm) embedded in a glassy matrix has been investigated. In the low-frequency Raman scattering range (< 100 cm −1) a fine structure due to the confinement of acoustic modes is observed. The Raman line corresponding to the interaction with the optical modes (new 210 cm −1) shifts and widens with a decreasing of the particle size. These experimental results can be described by a single model based on the size dependence of the eigenvibration modes of spherical particles in a matrix.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(96)00164-0