Metallic nanowires find widespread applicability, and a variety of synthesis techniques are available. Among these, template assisted deposition offers flexibility in terms of material and dimensional control. Here, we demonstrate a galvanic displacement process in combination with a nanoporous anodic aluminum oxide (AAO) template to fabricate copper nanowires. The AAO template was fabricated by anodizing aluminum in oxalic acid. Pore diameter and length could be readily controlled by adjusting the anodization parameters. Barrier layer thinning and chemical pore widening were then employed to open the pores at the bottom to expose the underlying aluminum metal. The synthesized AAO was used for the growth of copper nanowires by employing a chemical reduction reaction. This involved the dissolution of the aluminum metal and deposition of copper from the solution to form nanowires. The nanowires were then released from the template by etching and sonication and used as an electrode for electrochemical denitrification. The galvanic displacement demonstrated in this work offers a single step process for growing nanowires and can be readily adapted for a variety of metals and alloys using AAO.

中文翻译：

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阳极氧化铝模板辅助使用电化学置换过程的电化学脱氮合成铜纳米线

金属纳米线发现了广泛的适用性，并且可以使用多种合成技术。其中，模板辅助沉积在材料和尺寸控制方面提供了灵活性。在这里，我们展示了与纳米多孔阳极氧化铝（AAO）模板相结合的电流置换过程，以制造铜纳米线。AAO模板是通过在草酸中对铝进行阳极氧化制成的。孔的直径和长度可以通过调节阳极氧化参数来容易地控制。然后采用阻挡层变薄和化学扩孔来打开底部的孔，以露出下面的铝金属。通过化学还原反应将合成的AAO用于铜纳米线的生长。这涉及铝金属的溶解和溶液中铜的沉积以形成纳米线。然后通过蚀刻和超声处理将纳米线从模板中释放出来，并用作电化学反硝化的电极。在这项工作中证明的电流位移提供了用于生长纳米线的单步过程，并且可以使用AAO轻松适应各种金属和合金。