Octapod-Shaped Colloidal Nanocrystals of Cadmium Chalcogenides via "One-Pot" Cation Exchange and Seeded Growth

被引：164

作者：

Deka, Sasanka ^{[1
]}

Miszta, Karol ^{[1
]}

Dorfs, Dirk ^{[1
]}

Genovese, Alessandro ^{[1
]}

Bertoni, Giovanni ^{[1
]}

Manna, Liberato ^{[1
]}

机构：

[1] Ist Italiano Tecnol, I-16163 Genoa, Italy

来源：

NANO LETTERS | 2010年 / 10卷 / 09期

关键词：

Quantum dot; semiconductor; heterostructure; tetrapod; octapod; multipod; INORGANIC NANOCRYSTALS; IONIC NANOCRYSTALS; NANORODS; AMPLIFICATION; ALLOY; ROD;

D O I：

10.1021/nl102539a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The growth behavior of cadmium chalcogenides (CdE = CdS, CdSe, and CdTe) on sphalerite Cu2-xSe nanocrystals (size range 10-15 nm) is studied. Due to the capability of Cu2-xSe to undergo a fast and quantitative cation exchange reaction in the presence of excessive Cd2+ ions, no Cu2-xSe/CdE heterostructures are obtained and instead. branched CdSe/CdE nanocrystals are built which consist of a sphalerite CdSe core and wurtzite CdE arms. While CdTe growth yields multiarmed structures with overall tetrahedral symmetry, CdS and CdSe arm growth leads to octapod-shaped nanocrystals. These results differ significantly from literature findings about the growth of CdE on sphalerite CdSe particles, which until now had always yielded tetrapod-shaped nanocrystals.

引用

页码：3770 / 3776

页数：7

共 33 条

[21] Anisotropic optical emission of single CdSe/CdS tetrapod heterostructures: Evidence for a wavefunction symmetry breaking [J].