Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA.
Department of Biomedical Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA.
Adv Mater. 2024 Jun;36(25):e2400082. doi: 10.1002/adma.202400082. Epub 2024 Apr 8.
Soft and stretchable conductors with high electrical conductivity and tissue-like mechanical properties are crucial for both on-skin and implantable electronic devices. Liquid metal-based conductors hold great promise due to their metallic conductivity and minimal stiffness. However, the surface oxidation of liquid metal particles in polymeric matrices poses a challenge in forming a continuous pathway for highly conductive elastic composites. Here, it is reported a printable composite material based on liquid metal and conducting polymer that undergoes a self-assembly process, achieving high conductivity (2089 S cm) in the bottom surface while maintaining an insulated top surface, high stretchability (>800%), and a modulus akin to human skin tissue. This material is further applied to fabricate skin-interfaced strain sensors and electromyogram sensors through 3D printing.
具有高导电性和类组织机械性能的柔软可拉伸导体对于表皮和可植入电子设备都至关重要。基于液态金属的导体由于其金属导电性和最小的刚性而具有很大的应用前景。然而，在聚合物基体中液态金属颗粒的表面氧化使得形成高导电性弹性复合材料的连续通路成为挑战。在此，报道了一种基于液态金属和导电聚合物的可打印复合材料，该复合材料经历了自组装过程，在底面实现了高导电性（2089 S cm），同时保持了绝缘的顶面，高拉伸性（>800%），以及类似于人体皮肤组织的模量。该材料进一步通过 3D 打印应用于制造皮肤界面应变传感器和肌电图传感器。
