CdS/ZnS包覆结构纳米微粒的微乳液合成及光学特性

PREPARATION OF COATED CdS/ZnS NANOPARTICLE IN MICROEMULSION AND THEIR OPTICAL PROPERTIES

利用微乳液法合成ＣｄＳ纳米微粒， 并对其进行表面修饰， 得到具有ＣｄＳ／ＺｎＳ包覆结构的纳米微粒， 以吸收光谱与透射电镜表征其粒度与包覆结构， 得到ＣｄＳ内核的直径为５ｎｍ ，ＣｄＳ／ＺｎＳ包覆结构总粒径为８～１０ｎｍ ， 吸收阈值及发射峰的蓝移起因于量子限域效应． 并观测到ＺｎＳ的包覆可减弱ＣｄＳ纳米微粒的表面态发射、增强带边发射、并使带边发射进一步蓝移．

It is reported in this paper that CdS nanopatricle was synthesized in microemulsion, and the surface of CdS nanoparticle was decorated by depositing a layer of ZnS, then formed CdS/ZnS coated structrue nanoparticle. The size and the coated structure was characterized by absorption spectra and TEM.The diameter of CdS core is 5nm. The total diameter of CdS/ZnS coated structure is 8～10nm. The blue shift of λ threshold and PL peak is caused by quantum size effect. The coating of ZnS can reduce the emission of surface traps of CdS nanoparticle and enhance the emission of band edge and lead it blue shift more.