Conductive polymer hydrogels have received enormous attention because of their promising applications in healthcare monitoring, soft robots, and wearable electronics. Development of hydrogel sensor with strong mechanical properties, excellent sensing capabilities, self-healing and adhesive properties is highly desirable and still remains a critical challenge. Herein, we report a borax crosslinked flexible hydrogel based on polyvinyl alcohol (PVA), sodium alginate (SA), and tannic acid (TA) modify barium titanate (BT) nanoparticles (T@BT) via a facile one-pot method. The crosslinking network was formed by dynamic reversible borate ester bond and TA-enabled interactions including hydrogen bonds and coordination bonds, which endowed the hydrogel with excellent self-healing and mechanical properties. Meanwhile, the combination of functional catechol groups in TA with the significantly improved cohesion of the hydrogel enabled the hydrogel to exhibit strong and residue-free adhesion to a variety of inorganic and organic materials. The adhesion strength to wood was up to 67.5 kPa. Furthermore, the addition of the T@BT not only rendered the hydrogel highly conductive (1.91 S/m) and sensitive for sensing, but also synergistically enhanced the toughness (587.1 KJ/m³) of the hydrogel. This work provides new ideas for the preparation of multifunctional conductive hydrogels.

导电聚合物水凝胶因其在医疗保健监测、软机器人和可穿戴电子产品中的应用前景而受到广泛关注。开发具有强大机械性能、出色传感能力、自修复和粘合性能的水凝胶传感器是非常可取的，并且仍然是一个关键挑战。在此，我们报告了一种基于聚乙烯醇 (PVA)、海藻酸钠 (SA) 和单宁酸 (TA) 的硼砂交联柔性水凝胶，通过简便的一锅法改性钛酸钡 (BT) 纳米粒子 (T@BT)。交联网络是由动态可逆硼酸酯键和包括氢键和配位键在内的 TA 相互作用形成的，赋予水凝胶优异的自修复和机械性能。同时，TA 中的功能性儿茶酚基团与显着改善的水凝胶内聚力相结合，使水凝胶能够对各种无机和有机材料表现出强而无残留的粘附力。对木材的粘合强度高达 67.5 kPa。此外，添加 T@BT 不仅使水凝胶具有高导电性 (1.91 S/m) 和传感敏感，而且还协同增强了韧性 (587.1 KJ/m)³）水凝胶。该工作为多功能导电水凝胶的制备提供了新思路。