核壳结构CdS／ZnS荧光量子点的制备与荧光性能研究  

Preparation and characterization of core/shell structured CdS/ZnS quantum dots

作　　者：蔡晓军[1] 于郭[2] 崔文国[2] 李孝红[1,2] 

机构地区：[1]西南交通大学生命科学与工程学院,四川成都610031 [2]西南交通大学材料学院,材料先进技术教育部重点实验室,四川成都610031

出　　处：《功能材料》2009年第10期1643-1646,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(30570501);教育部博士点基金资助项目(20050613025)

摘　　要：以氧化镉为镉源、硫单质为硫源、油酸为配体、在十八烯体系中合成单分散的CdS纳米颗粒,研究了配体浓度对纳米微粒的生长动力学、颗粒尺寸分布的影响。采用乙基黄原酸锌作为Zn、S源的反应前体,采用逐滴滴加的方法制备了具有核壳结构的CdS/ZnS量子点,吸收光谱和荧光光谱表明CdS/ZnS纳米粒子比单一的CdS纳米粒子具有更优异的发光特性。透射电子显微镜、X射线粉末衍射、X射线光电子能谱、选区电子衍射证明ZnS在CdS表面进行了有效包覆。所制备核壳结构纳米粒子具有较好的尺寸分布,荧光发射峰半高峰宽为18～20nm,荧光量子产率达40%。By using cadmium oxide as the Cd precursor, sulfur powder as the S precursor and oleie acid as the capping agent, an organometallic approach has been exploited to synthesize highly monodispersed CdS quantum dots in non-coordinating solvents octadecene. The effects of oleic acid concentration on the growth kinetics, size and size distribution were examined. Zinc ethylxanthate was used as the precursor to obtain highly luminescent CdS/ZnS core/shell nanocrystals. Compared to CdS nanoparticles, a remarkable emission enhancement for CdS/ ZnS nanoparticles was observed by UV-vis absorption and fluorescence spectra. Characterizations on the morphology, structure and chemical composition of core/shell nanocrystals were performed with X-ray diffraction, transmission electronic microscopy, X-ray photoelectron spectroscopy and select area electron diffraction. Resuits demonstrated that highly luminescent CdS/ZnS nanocrystals have been effectively fabricated. A narrow full-width at half maximum of 18-20nm in the blue spectral region was achieved with the quantum yield approach to 40%.

关 键 词：量子点 有机金属热解法 CDS ZNS 

分 类 号：O472.31[理学—半导体物理]