Chen Shuwen, Fan Shicheng, Qi Jiaming, Xiong Ze, Qiao Zheng, Wu Zixiong, Yeo Joo Chuan, Lim Chwee Teck
Institute for Health Innovation and Technology (iHealthtech), National University of Singapore, Singapore, 119276, Singapore.
Department of Biomedical Engineering, National University of Singapore, Singapore, 117583, Singapore.
Adv Mater. 2023 Feb;35(5):e2208569. doi: 10.1002/adma.202208569. Epub 2022 Dec 15.
Human-interfaced electronic systems require strain-resilient circuits. However, present integrated stretchable electronics easily suffer from electrical deterioration and face challenges in forming robust multilayered soft-rigid hybrid configurations. Here, a bilayer liquid-solid conductor (b-LSC) with amphiphilic properties is introduced to reliably interface with both rigid electronics and elastomeric substrates. The top liquid metal can self-solder its interface with rigid electronics at a resistance 30% lower than the traditional tin-soldered rigid interface. The bottom polar composite comprising liquid metal particles and polymers can not only reliably interface with elastomers but also help the b-LSC heal after breakage. The b-LSC can be scalably fabricated by printing and subsequent peeling strategies, showing ultra-high strain-insensitive conductivity (maximum 22 532 S cm ), extreme stretchability (2260%), and negligible resistance change under ultra-high strain (0.34 times increase under 1000% strain). It can act as stretchable vertical interconnect access for connecting multilayered layouts and can be scalably and universally fabricated on various substrates with a resolution of ≈200 µm. It is demonstrated that it can construct stretchable sensor arrays, multi-layered stretchable displays, highly integrated haptic user-interactive optoelectric E-skins, visualized heaters, robot touch sensing systems, and wireless powering for wearable electronics.
人机交互电子系统需要具备应变弹性的电路。然而，目前的集成可拉伸电子器件很容易出现电气性能恶化的情况，并且在形成坚固的多层软硬混合结构方面面临挑战。在此，引入了一种具有两亲性的双层液固导体（b-LSC），以可靠地连接刚性电子器件和弹性体基板。顶部的液态金属能够以比传统锡焊刚性界面低30%的电阻自焊接其与刚性电子器件的界面。底部由液态金属颗粒和聚合物组成的极性复合材料不仅能够可靠地与弹性体连接，还能帮助b-LSC在断裂后自愈。b-LSC可以通过印刷和后续剥离策略进行规模化制造，展现出超高的应变不敏感导电性（最大22532 S/cm）、极高的拉伸性（2260%）以及在超高应变下可忽略不计的电阻变化（在1000%应变下增加0.34倍）。它可以作为可拉伸垂直互连通道来连接多层布局，并且能够以约200 µm的分辨率在各种基板上进行规模化和通用制造。结果表明，它可以构建可拉伸传感器阵列、多层可拉伸显示器、高度集成的触觉用户交互光电电子皮肤、可视化加热器、机器人触摸传感系统以及用于可穿戴电子设备的无线供电。
