Abstract
Paper-based wearable sensors are becoming popular in flexible electronic devices, owing to their good degradability, high permeability, low cost, and scalable production. However, the strong water absorption of the paper limits its application in wearable strain sensors. Herein, a hydrophobic and breathable paper/MXene/sizing agent (PMS) flexible strain sensor is reported by facile successive dip coating methods. The MXene layer endows the composite with high sensing performance while the sizing agent layer ensures its hydrophobicity. This PMS sensing film demonstrated high sensitivity (gauge factor, GF = 161) in the bending angle of 0-120° and excellent durability of 100,000 cycles in bending deformation of 30°. Benefiting from the paper substrate and the biomass sizing agent, this sensor exhibits superior hydrophobicity (contact angle, CA = 133.4°), good air permeability (154.08 mm/s), and high degradability. For the proof of concept, human movement detection and wearable Morse code wireless transmission systems under water conditions are demonstrated. This work presents an appropriate strategy for building comfortable and versatile paper-based wearable electronics.
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