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Ultrathin ZnO nanoneedles were grown on GaN substrate by the low temperature aqueous solution method. FESEM results demonstrated that the ZnO nanoneedles stem and a tip have a diameter of 100–200nm and 10–30nm and length (stem) 300–500nm and (tip) 200–600nm respectively. Structural analysis showed that ZnO nanoneedles are single crystalline with wurtzite hexagonal phase and grown along the c-axis...
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