Phase-separated porous nanocomposite with ultralow percolation threshold for wireless bioelectronics.
Phase-separated porous nanocomposite with ultralow percolation threshold for wireless bioelectronics.
复制标题
DOI：
10.1038/s41565-024-01658-6
复制
发表时间：
2024-04
影响因子：
38.3
通讯作者：
Yadong Xu;Zhilu Ye;Ganggang Zhao;Qihui Fei;Zehua Chen;Jiahong Li;Minye Yang;Yichong Ren;Benton Berigan;Yun Ling;Xiaoyan Qian;Lin Shi;Ilker Ozden;Jingwei Xie;Wei Gao;Pai-Yen Chen;Zheng Yan
中科院分区：
文献类型：
--
作者：
Yadong Xu;Zhilu Ye;Ganggang Zhao;Qihui Fei;Zehua Chen;Jiahong Li;Minye Yang;Yichong Ren;Benton Berigan;Yun Ling;Xiaoyan Qian;Lin Shi;Ilker Ozden;Jingwei Xie;Wei Gao;Pai-Yen Chen;Zheng Yan
在可穿戴设备、生物医学植入物和软机器人中实现可拉伸生物电子学的全部潜力需要导电弹性复合材料，这种复合材料本质上是柔软的、高导电性的和应变弹性的。然而，现有的复合材料通常会由于应变下导电路径的中断而损害电气耐久性和性能，并且严重依赖于高含量的导电填料。在这里，我们提出了一种原位相分离方法，促进了微尺度银纳米线的组装，并在孔隙表面上创建了自组织的渗透网络。所得的纳米复合材料具有高导电性、应变不敏感性和耐疲劳性，同时最大限度地减少了填料的使用。它们的弹性源于多尺度多孔聚合物基质，可以消散应力，而刚性导电填料可以适应应变引起的几何变化。值得注意的是，多孔微结构的存在使渗透阈值（Vc= 0.00062）降低了48倍，即使在超过600%的应变下也能抑制电降解。理论计算的结果与实验结果在数量上是一致的。通过将这些纳米复合材料与近场通信技术相结合，我们已经展示了可拉伸的无线电源和数据传输解决方案，这些解决方案对于皮肤界面和植入式生物电子学都是理想的。该系统可以实现无电池无线供电，并感应一系列汗液生物标志物，即使在50%的压力下，性能变化也小于10%。最终，我们的策略为各种应用提供了广泛的材料选择。
Realizing the full potential of stretchable bioelectronics in wearables, biomedical implants and soft robotics necessitates conductive elastic composites that are intrinsically soft, highly conductive and strain resilient. However, existing composites usually compromise electrical durability and performance due to disrupted conductive paths under strain and rely heavily on a high content of conductive filler. Here we present an in situ phase-separation method that facilitates microscale silver nanowire assembly and creates self-organized percolation networks on pore surfaces. The resultant nanocomposites are highly conductive, strain insensitive and fatigue tolerant, while minimizing filler usage. Their resilience is rooted in multiscale porous polymer matrices that dissipate stress and rigid conductive fillers adapting to strain-induced geometry changes. Notably, the presence of porous microstructures reduces the percolation threshold (Vc= 0.00062) by 48-fold and suppresses electrical degradation even under strains exceeding 600%. Theoretical calculations yield results that are quantitatively consistent with experimental findings. By pairing these nanocomposites with near-field communication technologies, we have demonstrated stretchable wireless power and data transmission solutions that are ideal for both skin-interfaced and implanted bioelectronics. The systems enable battery-free wireless powering and sensing of a range of sweat biomarkers—with less than 10% performance variation even at 50% strain. Ultimately, our strategy offers expansive material options for diverse applications.