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The ultralong ZnO nanowires have been obtained by using ZnO and graphite as the mixture source via the catalyst-free vapor–solid (VS) process at 917 °C. The ZnO nanowires are over 100 μm in length and ∼100–300 nm in diameter with uniform hexagonal cross section. The single ultralong ZnO nanowire grows on the top of one ZnO nanotower with the length of ∼5 μm and the diameter of ∼600 nm. The formation...
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