Citation: Yu ZHANG, Xin WANG, Ming MA, De Gang FU, Ning GU, Ju Zheng LIU, Zu Hong LU, Ling XU, Jun XU, Kun Ji CHEN. Size Dependence of First-order Hyperpolarizability of CdS Nanoparticles Studied by Hyper-Rayleigh Scattering[J]. Chinese Chemical Letters, ;2003, 14(9): 948-951.
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The second-order optical nonlinearity of CdS nanoparticles with different diameters of 28.0, 30.0, 31.5, 50.0, and 91.0 Å was studied by hyper-Rayleigh scattering technique.Results show that the first-order hyperpolarizability β value per CdS particle decreases as size is reduced to diameter of 31.5 Å; however, as CdS size further decreases, this trend is reversed and β value increases.Substantially, the normalized β value per CdS formula unit, β0, exhibits systematic enhancement with decreasing size.This phenomenon is interpreted in terms of a so-called surface contribution mechanism.
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