Ultra-long metal nanowires and their facile fabrication have been long sought after as they promise to offer substantial improvements of performance in numerous applications. However, ultra-long metal ultrafine/nanowires are beyond the capability of current manufacturing techniques, which impose limitations on their size and aspect ratio. Here we show that the limitations imposed by fluid instabilities with thermally drawn nanowires can be alleviated by adding tungsten carbide nanoparticles to the metal core to arrive at wire lengths more than 30 cm with diameters as low as 170 nm. The nanoparticles support thermal drawing in two ways, by increasing the viscosity of the metal and lowering the interfacial energy between the boron silicate and zinc phase. This mechanism of suppressing fluid instability by nanoparticles not only enables a scalable production of ultralong metal nanowires, but also serves for widespread applications in other fluid-related fields.

长期以来，人们一直在寻求超长金属纳米线及其简便的制造方法，因为它们有望在许多应用中显着提高性能。但是，超长金属超细/纳米线超出了当前制造技术的能力，从而对其尺寸和纵横比施加了限制。在这里，我们表明，通过将碳化钨纳米颗粒添加到金属芯中，以达到长度超过30厘米，直径低至170 nm的金属丝，可以缓解由热拉伸纳米线引起的流体不稳定性带来的限制。纳米颗粒通过增加金属的粘度和降低硅酸硼与锌相之间的界面能，以两种方式支持热拉伸。