Effect of Shell Thickness on the Optical Properties in CdSe/CdS/Zn0.5Cd0.5S/ZnS and CdSe/CdS/ZnxCd1-xS/ZnS Core/Multishell Nanocrystals

被引：42

作者：

Xu, Shasha ^{[1
]}

Shen, Huaibin ^{[1
]}

Zhou, Changhua ^{[1
]}

Yuan, Hang ^{[2
]}

Liu, Changsong ^{[1
]}

Wang, Hongzhe ^{[1
]}

Ma, Lan ^{[2
]}

Li, Lin Song ^{[1
]}

机构：

[1] Henan Univ, Key Lab Special Funct Mat, Minist Educ, Kaifeng 475004, Peoples R China

[2] Tsinghua Univ, Div Life Sci, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 43期

基金：

中国国家自然科学基金;

关键词：

LIGHT-EMITTING-DIODES; QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; SIZE; LUMINESCENCE; TIME; CDTE;

D O I：

10.1021/jp204831y

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：

The evolution of optical properties of two types of core/multishell nanocrystals (NCs)-type A (CdSe/CdS/Zn0.5Cd0.5S/ZnS) and type B (CdSe/CdS/ZnxCd1-xS/ZnS)-with an increase of shell thickness from 3.5 to 15.5 monolayers (MLs) has been studied. When the shell thickness was 9.5 MLs and more, the stability would be greatly improved and the quantum yields (QYs) almost did not change during the process of purification. Even after phase transfer experiment, the QYs of the water-soluble NCs were still kept 70-99% of their initial level. The as-prepared water-soluble NCs with 9.5 MLs and more also exhibited high stability in varying physiological conditions under PBS buffer and continuous UV radiation. For type B core/multishell NCs, due to a consecutive change of lattice parameters from core to shells, there were almost no defects induced between the CdSe core and ZnS shell. As a result, they had higher QYs and stability than type A core/multishell NCs at the same test condition.

引用

页码：20876 / 20881

页数：6

共 41 条

[41] Formation of water-soluble gold and silver nanocrystals using a phase transfer method based on surface-bound interactions
Zhou, Changhua
Xu, Weiwei
Lou, Shiyun
Zhang, Zhijun
Li, Lin Song
Chen, Jianmin
[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2010, 355 (1-3) : 139 - 145

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