水溶性的CdSe/ZnS纳米微粒的合成及表征  

Synthesis and Characterization of Water-Soluble CdSe/ZnS Core-shell Nanoparticles

作　　者：谢颖[1] 徐静娟[1] 于俊生[1] 陈洪渊[1] 

机构地区：[1]南京大学化学系,南京210093

出　　处：《无机化学学报》2004年第6期663-667,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20275016)

摘　　要：用L鄄半胱氨酸(Cys)作为稳定剂,合成了水溶性的CdSe/ZnS核壳结构的半导体纳米微粒。吸收光谱和荧光光谱表明,CdSe/ZnS纳米微粒比单一的CdSe纳米粒子具有更优异的发光特性。透射电子显微镜(TEM)、ED和XPS表征了CdSe/ZnS纳米微粒的结构、分散性及形貌。红外光谱证实半胱氨酸分子中的硫原子和氧原子参加了与纳米粒子表面的金属离子的配位作用。The water-soluble CdSe/ZnS core-shell nanoparticles have been synthesized by using L-cysteine hydrochloride as stabilizer. The optical properties of CdSe nanoclusters and the influence of ZnS shell on the CdSe core were studied by UV-Vis absorption and fluorescence spectroscopy. A remarkable emission enhancement with a factor of 3.5 for CdSe/ZnS core-shell nanoparticles in the intensity was observed compared to the CdSe nanoparticles. The maximum emission wavelength of CdSe/ZnS nanoparticles had a slight redshift. The absorption spectrum of CdSe/ZnS core-shell structure showed a small redshift as compared to the CdSe core. TEM, ED and XPS were used to characterize the size, shape and composition of CdSe/ZnS nanoclusters. Results of FT-IR show that sulfur and oxygen atoms in L-cysteine molecules took part in coordination with metal ions on the surface of the nanoparticles. There also existed amino-group on the surface of the core-shell nanoparticles. The above results demonstrate that the CdSe/ZnS nanoparticles are with a high degree of size-distribution and monodispersity in addition to the superior chemical stability and good optical characteristics.

关 键 词：CDSE ZNS 纳米微粒 合成方法 表征 光催化材料 发光材料 

分 类 号：TN104.3[电子电信—物理电子学] TB383[一般工业技术—材料科学与工程]