Flexible sensors have shown great potential in remote health monitoring, body movements track, electronic skin, human-machine interfaces, and soft robotics. Hydrogels possess exceptional stretchability, flexibility and biocompatibility that render them appealing candidates for wearable flexible sensors. Among them, considerable efforts have been devoted to developing conductive hydrogels to achieve multifunctional wearable sensing through using functional groups/additives/nanofillers to modify the hydrogel network in recent years. This review summarizes recent advances of applications of hydrogels in flexible wearable sensors, such as sweat sampling and flexible electrodes, strain/pressure sensors and touch panels, focuses on the multifunctional conductive hydrogels-based flexible wearable sensors with self-healing, self-adhesion, or anti-freezing capabilities. A brief introduction to representative synthesis methods and strategies of conductive hydrogels is also presented. In the end, we also provide a personal perspective on the future development, and address the remaining challenges in the commercialization of conductive hydrogels-based multifunctional flexible wearable sensors.

柔性传感器在远程健康监控，人体运动跟踪，电子皮肤，人机界面和软机器人方面显示出巨大潜力。水凝胶具有出色的可拉伸性，柔韧性和生物相容性，使其成为可穿戴柔性传感器的理想之选。其中，近年来，通过使用官能团/添加剂/纳米填料修饰水凝胶网络，致力于开发导电水凝胶以实现多功能可穿戴传感。这篇综述总结了水凝胶在柔性可穿戴式传感器（例如汗液采样和柔性电极，应变/压力传感器和触摸面板）中的最新应用进展，重点介绍了具有自修复，自粘力，基于导电性，基于水凝胶的多功能柔性可穿戴式传感器，或防冻功能。还简要介绍了代表性的导电水凝胶的合成方法和策略。最后，我们还提供了有关未来发展的个人观点，并解决了基于导电水凝胶的多功能柔性可穿戴传感器在商业化方面的剩余挑战。