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Vertical ZnO nanoneedles with sharp tips are secondarily grown on tips of primarily grown ZnO micropyramids by a vapour transport process.The field emission (FE) properties exhibit a lower tu-on electric fieM and a higher field enhancement factor as compared with vertical ZnO microrods.This result indicates that ZnO nanoneedles have good optimum shapes for FE due to electron accumulation at sharp tips.