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Large size needle-like ZnO microrods with diameters around 100μm and length of up to 2.5mm have been achieved by a simple method of thermal evaporation of ZnO powder discs in the open air. Metallic catalysts and vacuum condition are not necessary. Both the micro-sized and nano-sized ZnO rods were grown vertically at different sites of the substrate. The as-synthesized microrods and nanorods are pure...
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