Ti_(3)C_(2)MXene柔性应力/应变传感器的制备及应用研究进展

Research Progress on Preparation and Application of Flexible Stress/Strain Sensors Based on Two-Dimensional Ti_(3)C_(2)MXene

碳化钛迈科烯(Ti_(3)C_(2)MXene)是一种新型碳化物二维材料,具有手风琴的片层结构,受到拉伸或压缩会产生滑动或堆叠,使其内部导电路径和长度发生改变,直接影响输出电信号的变化。因此,Ti_(3)C_(2)MXene可以作为传感材料,检测应力/应变。与弹性基底复合,该材料可以制备柔性传感器,检测人体的运动与健康信号。本综述阐述了Ti_(3)C_(2)MXene作为应力/应变传感器的工作原理;归纳了近期Ti_(3)C_(2)MXene柔性传感器的制备方法并分为6类:静电纺丝法、过滤法/涂层法、浸渍法、丝网印刷法、冷冻干燥法、冷冻解冻法;对比讨论了这6种制备方法的关键指标:弹性基底、测量参数、最低测试极限、循环次数、测量范围、反应时间和应变灵敏度因数;列举了该传感器的常见应用场景。展望了Ti_(3)C_(2)MXene柔性传感器良好的发展前景,总结了当前亟待解决的问题。

Ti_(3)C_(2)MXene is a novel two-dimensional carbide with an accordion-like lamellar structure.The flakes of Ti_(3)C_(2)MXene can slide or stack under tension or compression,which can change the number and length of internal conductive paths and directly affect the output electrical signals.Thus,Ti_(3)C_(2)MXene can be used as sensing materials to measure the change of stress/strain.Combined with the elastic substrates,this material is used to make flexible sensors to monitor the motions and health signals of human-beings.This paper described the working principle of flexible stress/strain sensors made by Ti_(3)C_(2)MXene composites.Recent methods to prepare the sensors were reviewed,i.e.,electrospinning,filtration/coating,impregnation,screen printing,freeze drying,and freeze thawing.The key factors of the methods,i.e.,flexible substrate,sensing parameters,sensor structure,detection limit,cycle times,sensing rage,responsive time and gauge factor,were represented.Some applications of the MXene-based sensors were discussed.Finally,the promising development of Ti_(3)C_(2)MXene flexible sensors was outlooked and the problems to be solved were summarized.