Stretchable electronic circuits are critical for soft robots, wearable technologies and biomedical applications. 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 need, we introduce biphasic Ga–In, a printable conductor with high conductivity (2.06 × 10⁶ S m⁻¹), extreme stretchability (>1,000%), negligible resistance change when strained, cyclic stability (consistent performance over 1,500 cycles) and a reliable interface with rigid electronics. We employ a scalable transfer-printing process to create various stretchable circuit board assemblies that maintain their performance when stretched, including a multilayer light-emitting diode 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.

可拉伸电子电路对于软机器人、可穿戴技术和生物医学应用至关重要。复杂的可拉伸电路的开发需要在大应变下具有稳定导电性的新材料，以及软和传统（刚性）电子元件之间的低电阻界面。为了满足这一需求，我们引入了双相 Ga-In，一种具有高电导率 (2.06 × 10 ⁶  S m ^{-1 ) 的可印刷导体})、极高的拉伸性 (>1,000%)、应变时可忽略不计的电阻变化、循环稳定性（超过 1,500 次循环的稳定性能）以及与刚性电子设备的可靠接口。我们采用可扩展的转移印刷工艺来制造各种可拉伸的电路板组件，这些组件在拉伸时仍能保持其性能，包括用于可穿戴传感应用的多层发光二极管显示器、放大器电路和信号调理板。双相 Ga-In 与可扩展制造方法的兼容性、与现成电子元件的坚固接口以及电气/机械循环稳定性使已建立的电路板组件能够直接转换为柔软和可拉伸的形式。