水溶性ZnS量子点的共沉淀法制备、表征及其光学性能

摘要

以硫化钠和乙酸锌为反应物,3-巯基丙酸为表面包覆剂,利用共沉淀法制备了水溶性ZnS量子点。并采用X射线衍射仪、透射电子显微镜和荧光分光光度计等对样品的结构、形貌、粒径和光学性能进行了表征。结果表明：所得样品为ZnS立方型闪锌矿结构,量子点的形状呈不规则球形,粒径主要集中在4.8nm左右;样品在585～590nm之间出现了黄色荧光发射波峰。同时,利用红外光谱对ZnS量子点的合成机理进行了初步分析。%The water-soluble ZnS quantum dots were prepared by co-precipitation method with sodium sulfide and zinc acetate as reactants and 3-Mercaptopropionic acid（MPA） as surface coated agent.The microstructure,morphology,size and optical properties of the products were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,and fluorescence spectrophotometer（PL）.The results show that the products were irregular spherical cubic zinc blender ZnS with sizes around 4.8 nm and the emission maximized between 585 nm and 590 nm.The synthesis mechanism of ZnS quantum dots was studied by infrared spectroscopy（IR）.