Fe3+-Coordination mediated synergistic dual-network conductive hydrogel as a sensitive and highly-stretchable strain sensor with adjustable mechanical properties

exhibits highly linear sensitivity, a wide working region (gauge factor = 0.48 at 0-400% strain) and excellent durability (300 cycles). A strain sensor based on this hydrogel can detect not only large movements such as bending fingers and wrists but also delicate movements such as swallowing and a pulse, indicating its enormous potential in wearable devices, human health monitoring, electronic skin, human-machine interactions and so on.