| Well aligned ZnO nanowires were synthesized by thermal evaporation method using c-oriented ZnO thin films as substrate without any catalysts or additives. The synthesized nanowires have two typical average diameters: 60 nm in majority and 120 nm in minority. The ZnO nanowires are about 4 mm in length and well aligned along the normal direction of the substrate. Most of the ZnO nanowires are single crystalline with a hexagonal structure and grow along the [001] direction. Photoluminescence spectrum shows that the ZnO nanowires have a single strong ultraviolet emission at 380 nm, indicating that the ZnO nanowire arrays can be used in optoelectronic devices. |
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