Resonant Raman study of phonons in high-quality colloidal CdTe nanoparticles

Dzhagan, V.; Valakh, M. Ya.; Kolny-Olesiak, J.; Lokteva, I.; Zahn, D. R. T.
June 2009
Applied Physics Letters;6/15/2009, Vol. 94 Issue 24, p243101
Academic Journal
We report on a resonant Raman scattering study of colloidal CdTe nanoparticles (NPs). The perfect crystallinity and narrow size distribution of the NPs allowed at least three additional spectral features near the main longitudinal optical phonon peak to be resolved at 50 K. We assign these features to scattering by transverse (145 cm-1) and surface (159 cm-1) optical phonon modes as well as to a combined optical-acoustic phonon mode(s) (180–200 cm-1). Both the transverse and combined optical-acoustic phonon modes were not reported previously for CdTe NPs.


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