Nano Archive

Synthesis and optical properties of type IICdTe/CdS core/shell quantum dots in aqueous solution via successive ion layer adsorption and reaction

Zeng, Qinghui and Kong, Xianggui and Sun, Yajuan and Zhang, Youlin and Tu, Langping and Zhao, Jialong and Zhang, Hong (2008) Synthesis and optical properties of type IICdTe/CdS core/shell quantum dots in aqueous solution via successive ion layer adsorption and reaction. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (23). pp. 8587-8593.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp711395f

Abstract

3-Mercaptopropionic acid stabilized CdTe/CdS core/shell quantum dots (QDs) were prepared in an aqueous solution following the synthetic route of successive ion layer adsorption and reaction. The photoluminescence quantum yield of the CdTe QDs could reach 40%, from 8% of the bare core, via the control of the shell thickness. The CdTe/CdS QDs exhibited also a significant red shift of emission and excitation peaks when the shell layer grew. The experiments revealed that the CdTe/CdS QDs evolved from type I to type II core/shell structures with the increase of the shell thickness, and the evolution process is affected by the core size, shell thickness, surface quality of the core and shell, as unraveled by steady-state and time-resolved spectroscopy. The lack of photoluminescence lifetime lengthening was ascribed to the surface influence of the shell.

Item Type:Article
Subjects:Physical Science > Nano objects
Physical Science > Quantum phenomena
Material Science > Nanochemistry
ID Code:6061
Deposited By:IoN
Deposited On:05 Aug 2009 15:34
Last Modified:05 Aug 2009 15:34

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