Fiber-shaped electronics have attracted broad interests due to the surging demand for wearable devices in recent years. It is highly desired if we can design fiber or textile electronics that can respond to room temperature stimulus and be welded. In this work, we developed an efficient and scalable way to fabricate semiliquid metal coated conductive and weldable fibers in large quantity with various designed mechanical properties. The conductive fibers called Cu-Ga-In/fibers consist of natural and synthetic fiber cores, adhesive polymethacrylates coating and semiliquid metal (Cu-Ga-In) coating. Combining the unique mechanical properties of different fiber cores and high conductivity of Cu-Ga-In coating, conductive fibers with large tensile strength, knittability and strong stretchability are fabricated as high strength conductor, heater, and stretchable wire. Besides, Cu-Ga-In coating can realize liquid welding, response to room temperature stimulus and offer unique property of soft-stiffness switching. Finally, we demonstrated the applications of the Cu-Ga-In/fibers as 3D circuits and liquid bridges to reduce the resistance variation caused by the fiber stretching.

近年来，由于对可穿戴设备的需求激增，纤维状电子设备吸引了广泛的兴趣。我们迫切需要设计出能够响应室温刺激并进行焊接的纤维或纺织电子产品。在这项工作中，我们开发了一种有效且可扩展的方法来大量制造具有各种设计的机械性能的半液态金属涂覆的导电和可焊接纤维。称为Cu-Ga-In /纤维的导电纤维由天然和合成纤维芯，聚甲基丙烯酸甲酯胶粘剂涂层和半液态金属（Cu-Ga-In）涂层组成。结合不同纤维芯的独特机械性能和高导电性的Cu-Ga-In涂层，制造出具有高拉伸强度，可编织性和强拉伸性的导电纤维，作为高强度导体，加热器，和可拉伸的金属丝。此外，Cu-Ga-In涂层可以实现液体焊接，响应于室温刺激，并具有软硬度转换的独特性能。最后，我们演示了将Cu-Ga-In /纤维用作3D电路和液桥的应用，以减少由纤维拉伸引起的电阻变化。