核壳结构CdS:Mn/ZnS纳米晶的制备与光学性能研究  

Synthesis and optical properties of CdS∶Mn/ZnS core/shell nanocrystals

作　　者：翟辉[1] 曹立新[1] 柳伟[1] 苏革[1] 

机构地区：[1]中国海洋大学材料科学与工程研究院,山东青岛266100

出　　处：《功能材料》2011年第10期1898-1901,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50672089);2008年教育部新世纪人才支持计划资助项目(NCET-08-0511);山东省优秀中青年科学家奖励基金资助项目(BS2010CL049)

摘　　要：以3-巯基丙酸为稳定剂,采用共沉淀法在水相中合成了CdS∶Mn掺杂纳米晶,然后进一步将ZnS包覆于CdS∶Mn纳米晶表面,制备了CdS∶Mn/ZnS核壳结构纳米晶。利用X射线衍射(XRD),透射电子显微镜(TEM)和紫外-可见吸收光谱(UV-Vis)对纳米晶的结构、形貌和光学性质进行了表征,发现制备的纳米晶具有优秀的单分散性,确认合成了CdS∶Mn/ZnS核壳结构纳米晶。通过荧光光谱(PL)研究了纳米晶的发光性质和光稳定性,结果表明包覆壳层后纳米晶的发光强度显著提高,最高可达8倍,且Mn2+离子的发光峰峰位置随着ZnS壳层数的增加而红移。此外,核壳纳米晶的光稳定性大大提高。With 3-mercaptopropionic acid as stabilizer,CdS∶Mn nanocrystals were synthesized by a co-precipitation technique in aqueous phase,and then CdS∶Mn/ZnS core/shell nanocrystals were prepared by ZnS epitaxial coated on the surface of CdS∶Mn nanocrystals.The crystal structure,morphology and optical property of the nanocrystals were characterized by X-ray diffraction,transmission electron microscopy and UV-Vis absorption spectroscopy.The results showed that nanocrystals were nearly monodisperse and confirmed that ZnS was grown on the surface of CdS∶Mn nanocrystals.Luminescence and photostability of the nanocrystals were researched with photoluminescence emission spectroscopy.Luminescence intensity of the core/shell nanocrystals was significantly enhanced up to eight times,and the Mn2＋ photoluminescence peak was gradually red-shifted as the ZnS shell increased.Furthermore,a strongly improved photostability of the optical properties was observed.

关 键 词：CdS∶Mn/ZnS 纳米晶 核壳结构 MN掺杂 

分 类 号：O611.4[理学—无机化学]