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Hierarchical‐structure ZnO consisting of ZnO nanoneedles on ZnO nanofibers was fabricated by a two‐step procedure – first electrospinning and then aqueous solution processes. Field emission (FE) property of the needle‐on‐fiber hierarchical‐structure ZnO was tested. The low turn‐on field of the field emission at 4.8 V/μm was obtained with the current density of 10 μA/cm2. The field enhancement factor...
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