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Preparation of Core-Shell Structure CdS/ZnS Nanoparticles and Their Optical Properties
Zhou Jianan,Li Dongmei,Sang Wenbin,Fan Zengyi,Wang Hui
Author NameAffiliationE-mail
Zhou Jianan School of Materials Science and Engineering, Shanghai University, Shanghai 201800  
Li Dongmei School of Materials Science and Engineering, Shanghai University, Shanghai 201800 dmli@mail.shu.edu.cn  
Sang Wenbin School of Materials Science and Engineering, Shanghai University, Shanghai 201800  
Fan Zengyi School of Materials Science and Engineering, Shanghai University, Shanghai 201800  
Wang Hui School of Materials Science and Engineering, Shanghai University, Shanghai 201800  
Abstract:
CdS and CdS/ZnS core-shell structure nano particles were synthesized in micro emulsion, and characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM), UV absorption spectra and PL. The average diameter of CdS was about 3.3 nm, and CdS/ZnS core-shell structure was confirmed by XRD and UV. Considering the optical properties of CdS/ZnS core-shell structure nanoparticles which have different ZnS shell thickness, the UV absorption edge of CdS/ZnS becomes as lightred-shift with the thickness of ZnS layer increasing, and the absorption of shortwave band is strongly enhanced at the same time. The PL spectra indicate that ZnS shell layer can greatly eliminate surface defects of CdS nanoparticles and make its band-edge directed recombination increased, and the luminous efficiency of CdS is improved greatly when it has appropriate shell thickness.
Key words:  CdS, ZnS, Core-shell structure, Nanoparticles, Luminous efficiency
FundProject:
核壳结构CdS/ZnS纳米微粒的制备与光学特性
周建安,李冬梅*,桑文斌,范曾轶,王慧
摘要:
用微乳液法制备CdS纳米微粒,以ZnS对其进行表面修饰,得到具有核壳结构的CdS/ZnS纳米微粒.采用X射线衍射(XRD)、透射电镜(TEM)表征其结构、粒度和形貌,紫外-可见吸收光谱(UV)、光致发光光谱(PL)表征其光学特性.制得的CdS近似呈球形,直径为3.3 nm;以XRD和UV证实了CdS/ZnS核壳结构的实现.研究了不同ZnS壳层厚度对CdS纳米微粒光学性能的影响, UV谱表明随着壳层厚度的增加纳米微粒的吸收带边有轻微的红移,同时短波吸收增强; PL谱表明壳层ZnS的包覆可减少CdS纳米微粒的表面缺陷,带边直接复合发光的几率增大,具有合适的壳层厚度时发光效率大大提高.
关键词:  CdS  ZnS  核壳结构  纳米微粒  发光效率
DOI:10.1088/1674-0068/17/5/637-640
分类号: