Multimetallic nanowires with long-range atomic ordering hold the promise of unique physicochemical properties in many applications. Here we demonstrate the synthesis and study the stability of Cu₃Au intermetallic nanowires. The synthesis is achieved by using Cu@Au core-shell nanowires as precursors. With appropriate Cu/Au stoichiometry, the Cu@Au core-shell nanowires are transformed into fully ordered Cu₃Au nanowires under thermal annealing. Thermally-driven atom diffusion accounts for this transformation as revealed by X-ray diffraction and electron microscopy studies. The twin boundaries abundant in the Cu@Au core-shell nanowires facilitate the ordering process. The resulting Cu₃Au intermetallic nanowires have uniform and accurate atomic positioning in the crystal lattice, which enhances the nobility of Cu. No obvious copper oxides are observed in fully ordered Cu₃Au nanowires after annealing in air at 200 °C, a temperature that is much higher than those observed in Cu@Au core-shell and pure Cu nanowires. This work opens up an opportunity for further research into the development and applications of intermetallic nanowires.

具有长距离原子序的多金属纳米线在许多应用中都具有独特的物理化学性质的希望。在这里，我们证明了合成和研究Cu ₃ Au金属间纳米线的稳定性。合成是通过使用Cu @ Au核壳纳米线作为前体来实现的。通过适当的Cu / Au化学计量，Cu @ Au核壳纳米线在热退火下转变为完全有序的Cu ₃ Au纳米线。X射线衍射和电子显微镜研究表明，热驱动原子扩散可解释这种转变。Cu @ Au核壳纳米线中丰富的孪生边界促进了有序化过程。生成的Cu ₃金间金属纳米线在晶格中具有均匀且精确的原子定位，从而增强了铜的贵金属。在空气中于200°C退火后，在完全有序的Cu ₃ Au纳米线中未观察到明显的氧化铜，该温度远高于在Cu @ Au核壳和纯Cu纳米线中观察到的温度。这项工作为进一步研究金属间纳米线的开发和应用提供了机会。