复合结构纳米晶CdS:Cu/CdS的制备及光学特性  

Preparation and Optical Properties of CdS:Cu/CdS Nanocrystals

作　　者：蔡柯[1] 王洪哲[1] 申怀彬[1] 陶小军[1] 李林松[1] 杜祖亮[1] 

机构地区：[1]河南大学特种功能材料教育部重点实验室,开封475004

出　　处：《无机材料学报》2009年第2期247-250,共4页Journal of Inorganic Materials

基　　金：国家自然科学基金(90306010;20771035);教育部新世纪优秀人才计划(NCET-04-0653);国家重点基础研究计划(2007CB616911)

摘　　要：在非配位溶剂中合成了高质量的CdS纳米晶核,并利用Cu2+离子对其进行掺杂,制备了CdS∶Cu纳米晶.通过进一步采用连续离子层吸附反应的方法对CdS∶Cu纳米晶进行表面修饰,得到CdS∶Cu/CdS复合结构纳米晶.利用X射线衍射(XRD),透射电镜(TEM),紫外可见吸收光谱(UV-Vis)和荧光光谱(PL)对其结构、形貌以及光学性质进行了表征和分析,结果表明:所制备的复合结构CdS∶Cu/CdS纳米晶为立方闪锌矿结构;与CdS纳米晶核相比,掺杂Cu2+可以使其表面态发光发生红移;在CdS∶Cu纳米晶中,通过改变掺杂Cu2+的浓度,可以实现表面态发光在570和620nm之间的连续调节.与未经包覆的CdS∶Cu纳米晶相比,包覆层CdS增强了纳米晶CdS∶Cu的稳定性.CdS cores were successfully synthesized in noncoordinating solvents. The composite structure of core/shell CdS ： Cu/CdS nanocrystals was obtained through the modification of as-prepared Cu^2＋ ions doped CdS cores using successive ion layer adsorption and reaction （SILAR） technique. The crystal structures, shapes and optical properties of as-synthesized nanocrystals were characterized by X-ray diffraction, transmis- sion electron microscope, UV-Vis absorption and photoluminescence spectroscope. The results show that the crystal structure of as-prepared CdS ： Cu/CdS nanocrystal is zinc blende. Compared with pure CdS nanocrystals, the Cu^2＋ dopant in CdS leads the surface-state related emission peak shifting to longer wavelength. The sur- face-state related emission of CdS ： Cu nanocrystal can also be adjusted consecutively from 570nm to 620nm by tuning the doping concentration of Cu^2＋ ions from 2% to 6%. The overcoating of CdS shell can increase the stability of surface-state related emission of CdS ： Cu nanocrystals.

关 键 词：CdS∶Cu/CdS 纳米晶 掺杂 

分 类 号：TN304[电子电信—物理电子学]