Aqueous Synthesis of Zinc Blende CdTe/CdS Magic-Core/Thick-Shell Tetrahedral-Shaped Nanocrystals with Emission Tunable to Near-Infrared

被引：106

作者：

Deng, Zhengtao ^{[1
]}

Schulz, Olaf ^{[2
]}

Lin, Su ^{[1
]}

Ding, Baoquan ^{[1
]}

Liu, Xiaowei ^{[1
]}

Wei, XiXi ^{[1
]}

Ros, Robert ^{[2
]}

Yan, Hao ^{[1
]}

Liu, Yan ^{[1
]}

机构：

[1] Arizona State Univ, Dept Chem & Biochem, Biodesign Inst, Tempe, AZ 85287 USA

[2] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 16期

基金：

美国国家科学基金会;

关键词：

COLLOIDAL QUANTUM DOTS; BLINKING;

D O I：

10.1021/ja101476b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We demonstrate the synthesis of near-IR-emitting zinc blende CdTe/CdS tetrahedral-shaped nanocrystals with a magic-sized (similar to 0.8 nm radius) CdTe core and a thick CdS shell (up to 5 nm). These high-quality water-soluble nanocrystals were obtained by a simple but reliable aqueous method at low temperature. During the growth of the shell over the magic core, the core/shell nanocrystals change from type I to type II, as revealed by their enormous photoluminescence (PL) emission peak shift (from 480 to 820 nm) and significant increase in PL lifetime (from similar to 1 to similar to 245 ns). These thick-shell nanocrystals have a high PL quantum yield, high photostability, compact size (hydrodynamic diameter less than 11.0 nm), and reduced blinking behavior. The magic-core/thick-shell nanocrystals may represent an important step toward the synthesis and application of next-generation colloidal nanocrystals from solar cell conversion to intracellular imaging.

引用

页码：5592 / +

页数：3

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