【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.更多还原

【Abstract】 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 Cu2+ 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,transmission 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 Cu2+ dopant in CdS leads the surface-state related emission peak shifting to longer wavelength.The surface-state related emission of CdS ∶ Cu nanocrystal can also be adjusted consecutively from 570nm to 620nm by tuning the doping concentration of Cu2+ ions from 2% to 6%.The overcoating of CdS shell can increase the stability of surface-state related emission of CdS ∶ Cu nanocrystals.更多还原