Preparation and Optic Properties of Water-Soluble ZnO Quantum Dots

Chem. J. Chinese Universities

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Preparation and Optic Properties of Water-Soluble ZnO Quantum Dots

ZHUANG Jia¹*, CHI Yan-Hua², LIU Meng²

1. Department of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China;
2. Department of Chemistry, Southwest University of Science and Technology, Mianyang 621002, China

Received:2007-02-12 Revised:1900-01-01 Online:2007-12-10 Published:2007-12-10
Contact: ZHUANG Jia

Abstract

Abstract: SiO₂/ZnO water-soluble quantum dots were prepared by modification of (3-mercaptopropyl)tri-ethoxysilicane. The emission spectral peak of exciton fluorescence was raised by about 4 times in comparison with that of the quantum dots obtained by direct SiO₂ deposit on ZnO without modification. The introduction of hydrosulfide group(HS—) on ZnO, renders the quantum dots good water solubility, unique fluorescent stability and anti-congregation even at higher NaCl concentration. The water soluble blue SiO₂/ZnO quantum dots were also prepared by this method with some modification of the reaction conditions. The photogenic wavelength of this blue quantum dots was found to be 420 nm. The emission spectra were very symmetrical without obvious red tail. The full widths half maximum were only 46 nm.

Key words: ZnO, Water-soluble quantum dot, Surface coating, Optic property

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ZHUANG Jia¹*, CHI Yan-Hua², LIU Meng². Preparation and Optic Properties of Water-Soluble ZnO Quantum Dots[J]. Chem. J. Chinese Universities, doi: .

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Preparation and Optic Properties of Water-Soluble ZnO Quantum Dots

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