Large-Scale and Rapid Synthesis of Ultralong ZnO Nanowire Films via Anodization

In this Study, we report a facile and rapid synthesis strategy for preparing ultralong ZnO nanowire (NW) arrays by anodizing zinc foil at room temperature in a slightly basic solution, followed by annealing treatment. Detailed structure and composition characterizations are presented, including scanning electron microscopy, energy-dispersive X-ray spectrometry, transmission electron microscopy, and X-ray diffraction. We also explore the effects of temperature, applied voltage, and pretreatment on the anodization process. Oil the optimized conditions, dense NW film can be achieved, resulting in the enhanced optical absorption. More importantly, the as-prepared ZnO NWs have exhibited reasonable electronic properties. The zinc anodization technique, which does not involve complex chemicals and steps, is a low-cost and high-efficiency approach to large-scale synthesis of ultralong ZnO NW film, Suggesting the great potential in dye-sensitized solar cells and gas sensors.