Preparation of Cu–Zn/ZnO core–shell nanocomposite by surface modification and precipitation process in aqueous solution and its photoluminescence properties

A novel core–shell structure material, Cu–Zn/ZnO, was prepared by a surface modification precipitation process in aqueous solution at low temperature. A nucleation and crystal growth model for this structure was proposed. The resultant nanocomposites were characterized by X-ray diffraction, transmis...

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Bibliographic Details
Published in:Materials research bulletin 2006-11, Vol.41 (11), p.2154-2160
Main Authors: Yang, Nan, Yang, Haibin, Qu, Yuqiu, Fan, Yuzun, Chang, Lianxia, Zhu, Hongyang, Li, Minghui, Zou, Guangtian
Format: Article
Language:English
Subjects:
A. Nanostructure
A. Oxides
AQUEOUS SOLUTIONS
B. Chemical synthesis
CHEMICAL PREPARATION
COMPOSITE MATERIALS
COPPER
CRYSTAL DEFECTS
CRYSTAL GROWTH
D. Luminescence
FIELD EMISSION
LAYERS
MATERIALS SCIENCE
NANOSTRUCTURES
PHOTOLUMINESCENCE
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SHELLS
TRANSMISSION ELECTRON MICROSCOPY
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION
ZINC OXIDES
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Summary:A novel core–shell structure material, Cu–Zn/ZnO, was prepared by a surface modification precipitation process in aqueous solution at low temperature. A nucleation and crystal growth model for this structure was proposed. The resultant nanocomposites were characterized by X-ray diffraction, transmission electron microscope, field emission scanning electron microscope and photoluminescence spectroscope. Results showed that 20–50 nm thick ZnO shell was obtained on the surface of Cu–Zn nanopowders directly in the aqueous solution at 40 °C during the precipitation process and as-synthesized materials have a strong ultraviolet luminescence peak around 379–390 nm, but no usual defect-related emissions in visible range. The quantum confinement effect of ZnO nanocrystals, the presence of Cu and Zn atoms and absence of defects in ZnO layer are believed responsible for the characteristics of the photoluminescence spectra.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2006.03.033