Synthesis and characterization of mixed CdS-ZnS nanoparticles in reverse micelles

被引:78
作者
Qi, LM
Ma, JM
Cheng, HM
Zhao, ZG
机构
[1] Department of Chemistry, Peking University
关键词
coated particles; mixed semiconductor nanoparticles; photoluminescence; reverse micelles; ZnS-CdS;
D O I
10.1016/0927-7757(96)03545-5
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three different types of mixed CdS-ZnS semiconductor nanoparticles were synthesized in reverse micelles and were characterized by optical absorption and photoluminescence (PL) spectroscopy. The coprecipitated ZnxCd1-xS nanoparticles, comprised of homogeneously mixed crystals, show a continuously tunable energy gap from single CdS nanoparticles to ZnS nanoparticles. Coating the CdS core particles with a layer of ZnS in reverse micelles leads to ZnS-coated CdS (CdS/ZnS) nanoparticles with a core-shell structure, which show absorption and PL characteristics which differ considerably to those of either the coprecipitated particles or the sum of the separate particles. The intensity of the PL band centered at 630 nm, which arises from the coated CdS/ZnS nanoparticles, shows a maximum at a Zn/Cd molar ratio of about 1:1 on increasing the Zn/Cd ratio when the total concentration of CdS and ZnS is kept constant. CdS-coated ZnS (ZnS/CdS) nanoparticles synthesized in reverse micelles have absorption spectra similar to those of the coated CdS/ZnS nanoparticles but show no significant luminescence activation.
引用
收藏
页码:195 / 202
页数:8
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