柔性传感器要求具有良好的拉伸性能、柔韧性和足够的灵敏度，以监测和传输运动中微小的应变变化。通过聚乙烯醇（PVA）和MXene合成了MXene/PVA复合水凝胶。扫描电子显微镜显示MXene在复合水凝胶中均匀分散。傅里叶变换红外光谱验证了MXene和聚合物之间的强氢键相互作用。制备的MXene/PVA复合水凝胶具有796%的有限拉伸应变和高达48.66 kJ/m³的断裂能，表明其具有优异的力学性能。MXene/PVA复合水凝胶的电阻变化率与拉伸应变呈良好的线性响应（400%~800%），响应时间为0.3 s。这些优点使其能够实时监测人体的随机运动，如吞咽喉咙、弯曲手指、屈伸膝盖等。

Flexible sensors require good tensile properties, flexibility, and sufficient sensitivity to monitor and transmit small strain changes in motion. MXene/PVA composite hydrogel was synthesized by polyvinyl alcohol (PVA) and MXene. Scanning electron microscopy showed that MXene was uniformly dispersed in the composite hydrogel. Fourier transform infrared spectroscopy verified the strong hydrogen bonding interactions between MXene and the polymer. The prepared MXene/PVA composite hydrogels exhibited a finite tensile strain of 796% and an energy of rupture of up to 48.66 kJ/m³, suggesting excellent mechanical properties. The electrical resistance change rate of the MXene/PVA composite hydrogels showed a good linear response to the tensile strain (400%~800%), with a response time of 0.3 s. These advantages make it possible to monitor random movements of the human body in real time, such as swallowing the throat, bending the fingers, flexing and extending the knees.