Hyper-Rayleigh Scattering and Fluorescence of CdS-ZnS Nanoparticle Composites

摘要

Hyper-Rayleigh scattering (HRS) or incoherent second-order light scattering technique has been used to investigate the second-order optical nonlinearities of nanoparticles and seems sensitive to nanoparticle aggregation.In the present work,CdS and ZnS nanoparticle colloids are prepared by the method of colloidal chemistry.From absortpion spectra their average diameters are determined to be 5.0 nm for CdS AND 2.5 nm for ZnS.Composite CdS-ZnS colloids are obtained by mixing the two colloids at different concentration ratio.The formation of the composites is confirmed by fluorescence measurement.