Rational Design for Efficiently Improving the Sensitivity of Ti3C2 MXene-Based Waterborne Polyurethane Composites toward High- Performance Wearable Electronics

摘要

Surface structure modulation provides a feasible strategy for designing highly sensitive electronics. Herein, a "casting-permeat-ing-curing" method is proposed to fabricate high-performance composites using Ti3C2 MXene, modified carbon black (MCB), and waterborne polyurethane (WPU). The Ti3C2@MCB/WPU composite not only presents large stretchability (>400%) and robust strength (similar to 20.6 MPa) but also possesses superior conductivity, which results from the excellent interfacial interaction between Ti3C2@MCB and WPU. Most importantly, the interconnected conductive network with adjustable junctions constructed by hybrid conductive nanomaterials endows the composite with high sensitivity (gauge factor = 78.75). Therefore, the Ti3C2@MCB/WPU composite-based strain sensor features a wide sensing range (0-120 degrees), low detection limit (similar to 0.1 degrees), a short response time (similar to 142 ms), and excellent stability (similar to 1000 cycle fatigue tests). Benefiting from the above features, human motions, including pulse, phonation, and joint movement, are successfully and accurately detected by utilizing composite-based strain sensing. The findings demonstrate that the composite with versatilities exhibits wide potential in the fields of wearable electronics, smart robots, and human-machine interfaces.

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