表面修饰层厚度对Fe:ZnSe纳米晶光学性能的影响  

Influence of Thickness of Surface Passivation Layer on the Optical Properties of Fe:ZnSe Nanocrystals

作　　者：谢瑞士[1] 刘凌云[1] 李园利[1] 肖定全[1] 朱建国[1] 

机构地区：[1]四川大学,四川成都610064

出　　处：《稀有金属材料与工程》2011年第S2期472-475,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(60890203)

摘　　要：利用硫代乙醇酸作为稳定剂在水相中合成了Fe:ZnSe/ZnS核/壳结构半导体纳米晶,研究了表面修饰层(壳层)厚度对产物光学性能的影响。XRD和UV-Vis吸收谱表明,合成的半导体纳米晶为核壳纳米晶,呈立方闪锌矿结构。TEM结果表明,产物分散性较好,尺寸均一,呈球形。PL结果表明,适当厚度的ZnS壳层能有效钝化Fe:ZnSe纳米晶表面的非辐射复合位点,当壳层过厚时,ZnS壳层产生的非辐射复合缺陷会导致PL强度下降。Fe:ZnSe/ZnS core/shell nanocrystals were synthesized via aqueous synthesis using thioglycolic acid (TGA) as the stabilizer. The effect of thickness of surface passivation layer (shell) on the optical properties of as-synthesized samples was investigated. X-ray diffraction (XRD) results and UV-visible (UV-Vis) absorption spectra show that the as-prepared products are core-shell nanocrystals with cubic sphalerite structure. Transmission electron microscope (TEM) result indicates that spherical-shaped Fe:ZnSe/ZnS semiconductor nanocrystals exhibit a uniform size distribution. PL results demonstrate that nonradiative recombination sites of the Fe:ZnSe nanocrystals surface can be effectively passivated by appropriate thickness of ZnS shell; however, when the shell is too thick (exceed the critical value), nonradiative recombination defects generated by ZnS shell will lead to PL intensity of as-synthesized products decreased.

关 键 词：Fe:ZnSe 纳米晶 无机表面修饰 光学性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]