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摘要

Development of sophisticated stretchable circuits requires new materials with stable conductivity over large strains, and low-resistance interfaces between soft and conventional (rigid) electronic components. To address this, the authors introduce biphasic Ga-In, a printable conductor with high conductivity (2.06×10~6Sm~(-1)), extreme stretchability (＞l,000%), negligible resistance change when strained, cyclic stability (consistent performance over 1,500 cycles) and a reliable interface with rigid electronics. A scalable transfer-printing process is employed to create various stretchable PCB assemblies that maintain their performance when stretched, including a multilayer LED display, an amplifier circuit and a signal conditioning board for wearable sensing applications. The compatibility of biphasic Ga-In with scalable manufacturing methods, robust interfaces with off-the-shelf electronic components and electrical/mechanical cyclic stability enable direct conversion of established circuit board assemblies to soft and stretchable forms. (Nature Materials, Feb. 18, 2021).