A biocompatible, flexible, yet robust conductive composite hydrogel (CCH) for wearable pressure/strain sensors has been achieved by an all-solution-based approach. The CCH is rationally constructed by in situ polymerization of aniline (An) monomers in the polyvinyl alcohol (PVA) matrix, followed by the cross-linking of PVA with glutaraldehyde (GA) as the cross-linker. The unique multiple synergetic networks in the CCH including strong chemical covalent bonds and abundance of weak physical cross-links, i.e., hydrogen bondings and electrostatic interactions, impart excellent mechanical strength (a fracture tensile strength of 1200 kPa), superior compressibility (ε = 80%@400 kPa), outstanding stretchability (a fracture strain of 670%), high sensitivity (0.62 kPa^–1 at a pressure range of 0–1.0 kPa for pressure sensing and a gauge factor of 3.4 at a strain range of 0–300% for strain sensing, respectively), and prominent fatigue resistance (1500 cycling). As the flexible wearable sensor, the CCH is able to monitor different types of human motion and diagnostically distinguish speaking. As a proof of concept, a sensing device has been designed for the real-time detection of 2D distribution of weight or pressure, suggesting its promising potentials for electronic skin, human–machine interaction, and soft robot applications.

中文翻译：

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具有多个协同网络的可溶液加工导电复合水凝胶用于可穿戴压力/应变传感器

一种用于可穿戴压力/应变传感器的生物相容、灵活且坚固的导电复合水凝胶 (CCH) 已通过基于解决方案的方法实现。CCH是通过苯胺（An）单体在聚乙烯醇（PVA）基质中原位聚合，然后用戊二醛（GA）作为交联剂交联PVA而合理构建的。CCH 中独特的多重协同网络，包括强化学共价键和大量弱物理交联，即氢键和静电相互作用，赋予优异的机械强度（断裂拉伸强度为 1200 kPa），优异的压缩性（ε = 80 %@400 kPa)、出色的拉伸性（断裂应变为 670%）、高灵敏度（0.62 kPa ^–1在 0-1.0 kPa 的压力范围内进行压力传感，应变系数为 3.4，应变范围分别为 0-300% 时用于应变传感），以及突出的抗疲劳性（1500 次循环）。作为灵活的可穿戴传感器，CCH 能够监测不同类型的人体运动并在诊断上区分说话。作为概念证明，设计了一种用于实时检测重量或压力的 2D 分布的传感设备，表明其在电子皮肤、人机交互和软机器人应用方面具有广阔的潜力。