Hydrogel is an ideal choice as wearable sensors for human motion detection. However, low electrical sensitivity, narrow strain detection range and lack of self-healing performance still limit the further application and service life of hydrogel sensors. Herein, we report a self-healing ionic hydrogel based on copolymers of acrylic acid (AA) and acrylamide (AM), in which Fe³⁺ and tetramethylammonium chloride (TMAC) can bind with carboxylate through complex crosslinking and electrostatic interaction, respectively. Attribute to its supramolecular forces (including electrostatic interactions, hydrogen bonds) and complex cross-linking structure, the stretchable hydrogel has electrical-mechanical dual self-healing properties, that possess excellent mechanical properties (tensile strength at ∼320 kPa and strain at break ∼1600%), dual self-healing ability (∼87.5% self-healing efficiency in mechanical and instantaneous self-healing in electrical), ultra-high electrical sensitivity (GF = 18.26), and an extensive monitoring range (0.1–300% in strain and 8.15–31.56 kPa in pressure). This hydrogel shows great potential in wearable sensors for human motion detection.

水凝胶是人体运动检测的可穿戴传感器的理想选择。然而，低电灵敏度、狭窄的应变检测范围和缺乏自愈性能仍然限制了水凝胶传感器的进一步应用和使用寿命。在此，我们报道了一种基于丙烯酸 (AA) 和丙烯酰胺 (AM) 共聚物的自修复离子水凝胶，其中 Fe ³⁺和四甲基氯化铵 (TMAC) 可以分别通过复杂的交联和静电相互作用与羧酸盐结合。由于其超分子力（包括静电相互作用、氢键）和复杂的交联结构，可拉伸水凝胶具有机电双重自愈性能，具有优异的机械性能（拉伸强度在 ∼320 kPa 和断裂应变∼ 1600%）、双重自愈能力（机械自愈效率约为 87.5%，电气瞬间自愈效率）、超高电灵敏度（GF = 18.26）和广泛的监测范围（0.1-300% in应变和 8.15–31.56 kPa 的压力）。这种水凝胶在用于人体运动检测的可穿戴传感器中显示出巨大的潜力。