Abstract
We report a signi cant enhancement of the eld emission properties of ZnO nanowires by converting them to ZnO nanocones. The conversion of the morphology was realized by simple chemical etching of ZnO nanowires in an aqueous solution of HCl, while the initial areal density of nanowires was not a ected by the conversion. The eld emission measurements of ZnO nanowires and nanocones reveal that the eld enhancement factor is increased from 1105 (nanowires) to 3703 (nanocones), indicating that the tapered cone-like morphology is more e cient for eld emitters.
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