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Urchin-like multi-dimensional ZnO nanowhisker clusters with or without void at the center of the structures have been constructed by a simple aqueous solution route to directly oxidize metallic Zn powder in concentrated NaOH solution with pre-existence of the zincate ions under various temperature conditions in a closed Teflon reactor. The morphology, size and structure of the ZnO nanowhiskers obtained...
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