中文摘要：

在非配位溶剂中合成了高质量的CdS纳米晶核,并利用Cu^2＋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Cu^2＋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Cu^2＋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.

英文摘要：

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.