Synthesis, Characterization And Optical Properties F Cdse-Based Core Shell Quantum Dots And Dse@MS(M=Cd, Zn)-Au Heterotructures

Nearly monodispersed CdSe@CdS and CdSe@CdS@ZnS quantum dots were synthesizedthrough high-temperature decompisition and Successive Ionic Layer Adsorption and Reaction（SILAR） method, CdSe@CdSt-Au heterostructures were obtained through the reduction ofthe precursor Au(Au³⁺&Au⁺) by dodecanamine in CdSe@CdS toluene solution under roomtemperature. The structure and optical properties were characterized by Transmission ElectronMicroscope （TEM）, High Resolution Transmission Electron Microscopy （HRTEM）,Ultraviolet–visible Absorption Spectroscopy （UV-VIS）, Photoluminescence spectum（PL）,Photoluminescence Lifetime （PL-Lifetime） methods. Photoluminescence effect of quantumdots quenched after the formation of the heterostuctures, which can be attributed thetransferring of electron from semiconductor quantum dots to gold nanoparticles. Thisphenomena was studied in band therory and electronic properties of solids. This transferringeffect of photogenerating electron was adjusted through modulating the size of CdSe core andthe thickness of the shell. The variation trend of photoluminescence spectra caused by theformation of the heterostructure could fit well with the nonlinear Stern-Volmer equation.These results mentioned above established the foundation for understanding the interaction ofsemiconductor-gold nanoparticles and controlling the related phisicochemical properties.This kind of core@shell nanostructures decorated with noble metal nanoparticles notonly enriched the family of nanomaterials, but also offered numerous opportunities to avariety of potential applications, and built up the foundation for specific rational designing ofother heterostructures.