With decreasing size of integrated circuits in wearable electronic devices, the circuit is more susceptible to aging or fracture problem, subsequently decreasing the transmission efficiency of electricity. Micro-healing represents a good approach to solve this problem. Herein, we report a water vapor method to repair microfiber-based electrodes by precise positioning and rapid healing at their original fracture sites. To realize this micro-level conducting healing, we utilize a bimaterial composed of polymeric microfibers as healing agents and electrically conductive species on its surface. This composite electrode shows a high-performance conductivity, great transparency, and ultra-flexibility. The transmittance of our electrode could reach up to 88 and 90% with a sheet resistance of 1 and 2.8 Ω sq⁻¹, respectively, which might be the best performance among Au-based materials as we know. Moreover, after tensile failure, water vapor is introduced to mediate heat transfer for the healing process, and within seconds the network electrode could be healed along with recovering of its resistance. The recovering process could be attributed to the combination of adhesion force and capillary force at this bimaterial interface. Finally, this functional network is fabricated as a wearable pressure/ strain sensing device. It shows excellent stretchability and mechanical durability upon 1000 cycles.

随着可穿戴电子设备中集成电路尺寸的减小，电路更容易老化或断裂，从而降低了电的传输效率。微修复是解决此问题的一种好方法。本文中，我们报告了一种水蒸气方法，可通过精确定位和在其原始断裂部位快速愈合来修复基于微纤维的电极。为了实现这种微观水平的传导愈合，我们利用了由聚合微纤维作为愈合剂和其表面上的导电物质组成的双材料。该复合电极显示出高性能的导电性，高透明度和超柔韧性。我们的电极的透射率可以达到88％和90％，且薄层电阻为1和2.8Ωsq ^-1众所周知，这可能是金基材料中最好的性能。而且，在拉伸失效之后，引入水蒸气以介导热传递以用于愈合过程，并且在几秒钟内网络电极可以随着其电阻的恢复而被治愈。恢复过程可以归因于在该双材料界面处的粘附力和毛细作用力的组合。最终，该功能网络被制造为可穿戴的压力/应变感测设备。它在1000次循环后显示出出色的拉伸性和机械耐久性。