17 April 2000 Hyper-Rayleigh scattering of CdS nanoparticles with different surfaces in solution
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Proceedings Volume 3937, Micro- and Nano-photonic Materials and Devices; (2000) https://doi.org/10.1117/12.382803
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Abstract
Large third-order susceptibilities, (chi) (3) or (gamma) , have been observed for II-VI semiconductor nanoparticles. However, there are only few studies on the second-order susceptibilities because it is usually believed that the centrosymmetry or near-centrosymmetry of the particles eliminate the (beta) to zero or very small vale, Here the Hyper-Rayleigh scattering (HRS) technique is used to measure the second-order NLO response of nanoscale CdS Colloids with different surfaces in solution, which are denoted by CdS/Cd2+, CdS/S2-, CdS/SC(NH2)2 CdS/AOT- and CdS/Py. The result shows that the 'per particle' (beta) values for CdS nanoparticles are very large. And the (beta) values are different for CdS nanoparticles with different surfaces. Time dependent experiment show that the HRS signal deceases remarkably as time goes by. Further studies reveal that it has mutli-photon fluorescence (MPF) emission under the radiation of 1064 nm for newly made samples, but for aged stable sample the MPF is rather weak. All these experiments show that the HRS and MPF signals are very sensitive to the changes of the nanoparticle surface or the nanoparticle/solution interface. They also give the evidences proving that the surface termination of the crystalline lattice that creates a condition of non- centrosymmetry is contributing to the large (beta) values for CdS nanoparticles.
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Xin Wang, Yu Zhang, Yaochun Shen, Ming Li, DeGang Fu, Zu-Hong Lu, Yiping Cui, "Hyper-Rayleigh scattering of CdS nanoparticles with different surfaces in solution", Proc. SPIE 3937, Micro- and Nano-photonic Materials and Devices, (17 April 2000); doi: 10.1117/12.382803; https://doi.org/10.1117/12.382803
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