巯基乙酸稳定的CdSe/ZnS核壳结构量子点的制备与表征  

PREPARATION AND CHARACTERIZATION OF CdSe/ZnS CORE-SHELL QUANTUM DOTS STABILIZED BY THIOGLYCOLLIC ACID

作　　者：郁美娟[1] 刘维学[1] 王德平[1] 黄文[1] 周萘[1] 王璐[2] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]圣戈班研发(上海)有限公司,上海200245

出　　处：《硅酸盐学报》2007年第7期822-827,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50572072);上海市科委纳米专项基金(0452nm059)资助项目

摘　　要：用非均相成核原理,在水溶液中制备CdSe/ZnS核壳结构量子点,并研究合成工艺,包括前驱物的滴加方式和用量、CdSe核的水浴反应时间、CdSe与ZnS的摩尔比等因素对CdSe/ZnS核壳结构量子点荧光性能的影响。用透射电子显微镜和X射线衍射仪测试核壳结构量子点的形貌和结构。用紫外吸收光谱与荧光光谱表征CdSe/ZnS核壳结构量子点的荧光性能。结果表明:ZnS壳层在CdSe核量子点表面外延生长,形成了核壳结构;CdSe/ZnS核壳结构量子点的荧光性能明显高于单一的CdSe量子点;合成的工艺条件会显著影响CdSe/ZnS核壳结构量子点的荧光性能。Based on the heterogeneous nucleation theory, the CdSe/ZnS core/shell quantum dots were prepared in aqueous phase using the co-precipitation method. The influence of various factors, such as injection methods and dosages of precursors, water-bathing reaction duration of CdSe and the initial mole ratio of CdSe to ZnS, on the fluorescence properties of the obtained CdSe/ZnS quantum dots was investigated, The morphology and structure of the samples were characterized by transmission electron microscopy and X-ray diffraction. The photoluminescence properties of the CdSe/ZnS core/shell quantum dots were characterized by ultraviolet-visible absorption spectra and photoluminescence spectra. The results showed that epitaxial ZnS shells grow on the surface of CdSe quantum dots and form CdSe/ZnS core/shell quantum dots. The core/shell quantum dots have superior fluorescence properties in comparison to the CdSe plain core quantum dots. The technical conditions of preparation have a strong influence on the photolu- minescence of the CdSe/ZnS core-shell quantum dots.

关 键 词：量子点 硒化镉/硫化锌核壳结构 水相制备 荧光 

分 类 号：TN304.054[电子电信—物理电子学] O613.5[理学—无机化学]