Size effects on Raman spectra of small CdSe nanoparticles in polymer films

Abstract

The results of a resonant Raman scattering (RRS) study of polymer-stabilized colloidal CdSe nanoparticles (NPs) are reported. The size-selective nature of the RRS is demonstrated by analysing the NP ensembles with different average size and size distribution Δd using a set of excitation wavelengths. The effect of size selection on the estimation of and Δd values from the RRS spectra is discussed, as well as some peculiarities of RRS on surface optical phonons. From the experimentally observed small variation of the I2LO/ILO ratio for 2-5 nm NPs a minor effect of on the electron-phonon coupling strength in this range is supposed. © IOP Publishing Ltd.