【摘要】 离子导电水凝胶由于其在生物相容性、导电性和灵活性方面的独特优势,已成为可穿戴式人体运动检测传感器的最有希望的替代品之一.然而,目前的水凝胶电子器件仍然面临着不可重复使用性和单一信号检测功能的限制.在此,我们通过模拟生物体的网络结构和离子传导机制,制备了基于聚乙烯醇、海藻酸纤维和胶原蛋白的离子导电水凝胶,用于人体运动和电生理信号的双模式信号采集.通过海藻酸纤维和胶原蛋白的协同调节,水凝胶表现出类似皮肤的机械性能,具有低模量、高韧性和抗疲劳性,从而可以最大限度地提高水凝胶可穿戴传感器的穿着舒适度和运动检测能力.此外,具有与生物体相似离子传输行为的水凝胶导体可以用作表皮电极,收集包含重要人体生理信息的表皮电位.通过对可穿戴设备的合理设计和组装,水凝胶不仅可以连续、准确地识别全身运动信号,还可以采集肌电图、心电图等不同电生理信号.值得注意的是,这种基于非共价交联结构的水凝胶是完全可回收的,可以任意重组为新的电子器件,同时保持原有功能,提高水凝胶的可重复使用性,减少电子浪费.更多还原

【Abstract】 Ionic conductive hydrogels have emerged as one of the most promising alternatives to wearable sensors for human motion detecting,owing to their unique advantages in biocompatibility,conductivity and flexibility.However,the current hydrogel electronics still face the limitations of nonreusability and single-signal detection capability.Here,an ionic conductive hydrogel based on polyvinyl alcohol,sodium alginate fibers,and collagen was prepared by simulating the network structure and ion conduction mechanism of organisms for dual-mode signal acquisition of human motion and electrophysiological signals.Through the synergistic regulation of sodium alginate fibers and collagen,the hydrogels exhibit skin-like mechanical properties with low modulus,high toughness,and fatigue resistance to maximize the wearing comfort and motion detection capabilities of hydrogel wearable sensors.Furthermore,the hydrogel conductors with ion-transporting behavior close to organisms can be used as epidermal electrodes to collect the epidermis biopotential containing important human physiological information.As a result,through the rational design and assembly of wearable devices,hydrogels can be used to not only continuously and accurately identify whole-body motion signals,but also collect different electrophysiological signals such as electromyogram and electrocardiogram signals.Notably,the hydrogel based on the non-covalent cross-linked structure is completely recyclable,which can be arbitrarily reconstituted into new electronic devices while retaining the original function,improving the reusability of the hydrogels and reducing electronic waste.更多还原