Bright and water-soluble near IR-Emitting CdSe/CdTe/ZnSe Type-II/Type-I nanocrystals, tuning the efficiency and stability by growth

被引：114

作者：

Blackman, Bridgette ^{[1
]}

Battaglia, David ^{[2
]}

Peng, Xiaogang ^{[1
]}

机构：

[1] Univ Arkansas, Dept Chem & Biochem, Fayetteville, AR 72701 USA

[2] NN Labs LLC, Fayetteville, AR 72703 USA

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 15期

关键词：

D O I：

10.1021/cm8000688

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：

Highly photoluminescent CdSe/CdTe/ZnSe type-II/type-I composite nanocrystals, both dot- and peanut-shaped, were prepared via the modified successive ionic layer adsorption and reaction (SILAR) techniques, straight SILAR for peanut-shaped ones and SILAR coupled with thermal-cycling (SILAR-TC) for dotshaped ones. The CdSe/CdTe type-II heterojunction offered the nanocrystals with near-infrared emission and the CdTe/ZnSe type-I heterojunction helped to confine the photogenerated charges away from the ligands and solution environment. This structural feature makes the photoluminescence quantum yield of the CdSe/CdTe/ZnSe core/shell/shell type-II/type-I dots that have a uniformly grown ZnSe shell retain as high as 60% after replacing the original amine ligands with mercaptopropionic acid (MPA). Conversely, the emission of the corresponding CdSe/CdTe core/shell dots (CdSe/CdTe/ZnSe composite peanuts) was completely (almost completely) quenched by the same ligand treatment. The emission properties of the MPA-coated CdSe/CdTe/ZnSe core/shell/shell dots were stable in water in the buffer solutions with their pH in a range between about 5 and 9.

引用

页码：4847 / 4853

页数：7

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