Copper nanowire networks are considered a promising alternative to indium tin oxide as transparent conductors. The fast degradation of copper in ambient conditions, however, largely overshadows their practical applications. Here, we develop the synthesis of ultrathin Cu@Au core–shell nanowires using trioctylphosphine as a strong binding ligand to prevent galvanic replacement reactions. The epitaxial overgrowth of a gold shell with a few atomic layers on the surface of copper nanowires can greatly enhance their resistance to heat (80 °C), humidity (80%) and air for at least 700 h, while their optical and electrical performance remained similar to the original high-performance copper (e.g., sheet resistance 35 Ω sq^–1 at transmittance of ∼89% with a haze factor <3%). The precise engineering of core–shell nanostructures demonstrated in this study offers huge potential to further explore the applications of copper nanowires in flexible and stretchable electronic and optoelectronic devices.

中文翻译：

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超薄外延Cu @ Au核-壳纳米线，用于稳定的透明导体

铜纳米线网络被认为是铟锡氧化物作为透明导体的一种有前途的替代方法。然而，铜在环境条件下的快速降解大大掩盖了它们的实际应用。在这里，我们开发了使用三辛基膦作为强结合配体的超薄Cu @ Au核壳纳米线的合成方法，以防止电流取代反应。铜纳米线表面上具有几个原子层的金壳的外延过度生长可以极大地增强其在至少700 h的耐热性（80°C），湿度（80％）和空气的抵抗力，同时具有良好的光电性能仍然类似于原始的高性能铜（例如，薄层电阻35Ωsq ^–1透过率约为89％，雾度系数<3％）。这项研究表明，核-壳纳米结构的精确工程设计为进一步探索铜纳米线在柔性和可拉伸电子和光电设备中的应用提供了巨大的潜力。