Synthesis of ZnSe/CdS/ZnSe Nanobarbells Showing Photoinduced Charge Separation

被引:63
|
作者
Kirsanova, Maria
Nemchinov, Alexander
Hewa-Kasakarage, Nishshanka N.
Schmall, Nicholas
Zamkov, Mikhail [1 ]
机构
[1] Bowling Green State Univ, Ctr Photochem Sci, Bowling Green, OH 43403 USA
关键词
QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; HETEROSTRUCTURES; RECOMBINATION; NANORODS;
D O I
10.1021/cm901615n
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
We report on it colloidal synthesis of barbell-shaped nanocrystals comprising a type II hetero-junction of ZnSe and US domains and showing compelling evidence of photoinduced charge separation at the interface of ZnSe and US materials. The nanobarbells were fabricated in a two-step procedure by growing ZnSe caps onto polar facets of US nanorods. Under present synthetic conditions, minimal growth of ZnSe shell in the lateral direction and focusing of the barbell length distribution were observed. Formation of epitaxial interfaces between nearly lattice-matched ZnSe and US crystal phases was primarily evidenced by the observation of "spatially indirect" fluorescence and long radiative lifetimes corresponding to the decay of charge transfer states.
引用
收藏
页码:4305 / 4309
页数:5
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