Template Deformation‐Tailored ZnO Nanorod/Nanowire Arrays: Full Growth Control and Optimization of Field‐Emission

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. Deformation‐tailored colloidal crystal templates and electrodeposition are combined to facilely growth and fully control ZnO nanorod/nanowire arrays at the centimeter scale; control is exerted over their density, uniformity, and tapering. A low turn‐on electric field of 1.8 V µm−1, a high field‐enhancement factor of 5 750, and an emitting current density of up to 2.5 mA cm−2 are obtained.