Abstract Superplastic nanomolding (SPNM), a method to directly form nanostructures in metal surface through contact deformation by using a hard mold, provides a toolbox to mold essentially any metals on the nanoscale. Here, by superimposing an ultra-low frequency micro-vibration to the molding pressure, it is interesting to find that the molding efficiency can be drastically increased. Specifically, the length of molded Ag nanowires increased by 20% when a micro-vibration (with a frequency as low as 100 Hz) is exerted. The speeding growth of the Ag nanowires during SPNM is attributed to the interfacial friction reduction and material softening induced by vibration according to the experimental results. Based on the thermal activation theory, a theoretical model is developed, which predicts that the micro-vibration accelerated deformation increases as the vibration frequency, agreeing with experiments well. These findings are expected to facilitate the wide application of SPNM in the quick fabrication of metal nanostructures.

中文翻译：

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超低频微振动辅助超塑性纳米成型对金属纳米线加速生长的观察

摘要 超塑性纳米成型 (SPNM) 是一种通过使用硬模具通过接触变形直接在金属表面形成纳米结构的方法，它提供了一种工具箱，可以在纳米尺度上成型任何金属。在这里，通过将超低频微振动叠加到成型压力上，有趣的是发现成型效率可以显着提高。具体而言，当施加微振动（频率低至 100 Hz）时，模制银纳米线的长度增加了 20%。根据实验结果，SPNM 过程中银纳米线的快速生长归因于振动引起的界面摩擦减少和材料软化。基于热活化理论，建立了理论模型，预测微振动加速变形随着振动频率的增加而增加，与实验吻合较好。这些发现有望促进 SPNM 在金属纳米结构的快速制造中的广泛应用。