Template Deformation‐Tailored ZnO Nanorod/Nanowire Arrays: Full Growth Control and Optimization of Field‐Emission |
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Authors: | Haibo Zeng Xijin Xu Yoshio Bando Ujjal K Gautam Tianyou Zhai Xiaosheng Fang Baodan Liu Dmitri Golberg |
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Affiliation: | World Premier International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1‐1, Tsukuba, Ibaraki 305‐0044 (Japan) |
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Abstract: | Here, a facile and effective route toward full control of vertical ZnO nanorod (NR)/nanowire (NW) arrays in centimeter‐scale areas and considerable improvement of field‐emission (FE) performance is reported. Controlled deformation of colloidal crystal monolayer templates is introduced by heating near glass‐transition temperature. The NR/NW density, uniformity, and tapering were all adjusted through selection of template size and deformation, and electrolyte composition. In line with the adjustments, the field‐emission performance of the arrays is significantly improved. A low turn‐on electric field of 1.8 V µm?1, a field‐enhancement factor of up to 5 750, and an emitting current density of up to 2.5 mA cm?2 were obtained. These improved parameters would benefit their potential application in cold‐cathode‐based electronics. |
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Keywords: | Colloidal crystal templates Electrodeposition Field emission Nanowire arrays Zinc oxide |
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