Abstract
Conductive hydrogels have attracted tremendous attention due to their excellent softness and stretchability as wearable strain sensing devices. However, most of hydrogel-based strain sensors suffered from poor self-recoverability and fatigue resistance, resulting in significant decrease of strain sensitivity after recycling. Here, a soft and flexible wearable strain sensor is prepared by using an ionic conductive hydrogel with latex particles as physical cross-linking centers. The dynamic physical cross-linking structure can effectively dissipate energy through disruption and reconstruction of molecular segments, thereby imparting excellent stretchability, self-recoverability and fatigue resistance. In addition, the hydrogel exhibits excellent strain-sensitive resistance changes, which enables it to be assembled as a wearable sensor to monitor human motions. As a result, the hydrogel strain sensor can provide precise feedback for a wide range of human activities, including large-scale joint bending and tiny phonating. Therefore, the tough ionic conductive hydrogel would be widely applied in electronic skin, medical monitoring and artificial intelligence.
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