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.
参考文献
| [1] | Vasa P;Singh BP;Ayyub P .Coherence properties of the photoluminescence from CdS-ZnO nanocomposite thin films[J].Journal of Physics. Condensed Matter,2005(1):189-197. |
| [2] | 蔡晓军,于郭,崔文国,李孝红.核壳结构CdS/ZnS荧光量子点的制备与荧光性能研究[J].功能材料,2009(10):1643-1646. |
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