Effect of shell thickness on the optical properties in CdSe/CdS/Zn 0.5Cd0.5S/ZnS and CdSe/CdS/ZnxCd 1-xS/ZnS core/multishell nanocrystals

Shasha Xu; Huaibin Shen; Changhua Zhou; Hang Yuan; Changsong Liu; Hongzhe Wang; Lan Ma; Lin Song Li

doi:10.1021/jp204831y

Effect of shell thickness on the optical properties in CdSe/CdS/Zn _0.5Cd_0.5S/ZnS and CdSe/CdS/Zn_xCd _1-xS/ZnS core/multishell nanocrystals

Shasha Xu, Huaibin Shen, Changhua Zhou, Hang Yuan, Changsong Liu, Hongzhe Wang, Lan Ma, Lin Song Li

Research output: Contribution to journal › Article › peer-review

47 Scopus citations

Abstract

The evolution of optical properties of two types of core/multishell nanocrystals (NCs)-type A (CdSe/CdS/Zn_0.5Cd_0.5S/ZnS) and type B (CdSe/CdS/Zn_xCd_1-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.

Original language	English (US)
Pages (from-to)	20876-20881
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	115
Issue number	43
DOIs	https://doi.org/10.1021/jp204831y
State	Published - Nov 3 2011

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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title = "Effect of shell thickness on the optical properties in CdSe/CdS/Zn 0.5Cd0.5S/ZnS and CdSe/CdS/ZnxCd 1-xS/ZnS core/multishell nanocrystals",

abstract = "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.",

author = "Shasha Xu and Huaibin Shen and Changhua Zhou and Hang Yuan and Changsong Liu and Hongzhe Wang and Lan Ma and Li, {Lin Song}",

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T1 - Effect of shell thickness on the optical properties in CdSe/CdS/Zn 0.5Cd0.5S/ZnS and CdSe/CdS/ZnxCd 1-xS/ZnS core/multishell nanocrystals

AU - Xu, Shasha

AU - Shen, Huaibin

AU - Zhou, Changhua

AU - Yuan, Hang

AU - Liu, Changsong

AU - Wang, Hongzhe

AU - Ma, Lan

AU - Li, Lin Song

PY - 2011/11/3

Y1 - 2011/11/3

N2 - 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.

AB - 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.

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Effect of shell thickness on the optical properties in CdSe/CdS/Zn _0.5Cd_0.5S/ZnS and CdSe/CdS/Zn_xCd _1-xS/ZnS core/multishell nanocrystals

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