Abstract
The epitaxial growth of ZnO nanosheets and nanoneedles from a Zn/ZnO core/shellstructure is verified by an experiment in which the ZnO nanoneedles andnanosheets are synthesized in air within an ultra-low temperature range from 250 to400 °C by thermal oxidation of Zn films made up of hexagonal nanodiscs or nanoprisms. Thehexagonal Zn structures are oxidized to form a Zn/ZnO core/shell structure withan epitaxial relationship; ZnO nanoneedles and nanosheets are found to growepitaxially from the ZnO shell, along sixfold symmetric directions, showing the same lattice orientation as the Zn core. The stability differenceamong different facets of hexagonal Zn crystal structures plays a key role in the formationof ZnO nanosheets, nanoneedles and the Zn/ZnO core/shell structure, as well as ZnOhollow structures. A vapor–solid mechanism is suggested to explain the epitaxial growthprocess of the ZnO products. Photoluminescence properties of the ZnO nanostructures arealso explored.
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