Among various building components, intrinsically stretchable conductors present a class of enabling materials for soft forms of devices with inherent deformability 14. The compliant mechanical properties allow the intimate and stable integration of functional devices with the human body for a broad range of emerging fields, including health monitoring systems 5, 6, 7, 8, robotic prosthetics 9, 10, and human–machine interfaces 11, 12, 13. The rapid expansion and evolution of wearable technology have stimulated the growth of stretchable electronics 1, 2, 3, 4. The solution-based technique reported here is the enabler for the facile patterning of liquid metal features at low cost, which may find a broad range of applications in emerging fields of epidermal sensors, wearable heaters, advanced prosthetics, and soft robotics. The practical suitability is demonstrated by the heterogeneous integration of light-emitting diode (LED) chips with liquid metal interconnects for a stretchable and wearable LED array. The as-prepared liquid metal feature exhibits high resolution (100 μm), excellent electrical conductivity (4.15 × 10 4S cm −1), ultrahigh stretchability (1000% tensile strain), and mechanical durability. The entire process is carried out under ambient conditions and is generally compatible with various elastomeric substrates. In this study, we report a fully solution-based process to generate patterned features of the liquid metal conductor. The widespread implementations of liquid metal towards functional sensors and circuits are currently hindered by the lack of a facile and scalable patterning approach. Liquid metal represents a highly conductive and inherently deformable conductor for the development of stretchable electronics.
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