基于MXene柔性压阻传感器研究进展

Research Progress of Flexible Piezoresistive Sensor Based on MXene

柔性压阻传感器因在个人运动和健康监测等方面具有广阔的应用前景,近年来备受关注。MXene具有优异的导电性、亲水性,且易与其他功能材料复合,尤其是脆性结构使其在受力过程中极易产生微/纳裂纹,进而在制备高灵敏度压阻传感器方面极具优势。要实现人体全范围监测,压阻传感器需同时满足大的工作范围和高的灵敏度。然而,MXene微/纳裂纹的快速扩展导致其导电路径迅速遭到破坏,致使其工作范围较小。因此,近些年研究者们主要从构建各种微/纳结构方面不断尝试,使其在传感过程中保持导电路径的连通性或减缓微/纳裂纹的扩展,从而在充分发挥MXene高灵敏度优势的同时大幅拓宽其工作范围。基于此,本文对MXene的制备方法及压阻传感器的传感机理进行了归纳,然后分别从应变式和压力式两个方面对基于MXene的柔性压阻传感器的制备策略进行了综述,并对MXene基柔性压阻传感器的应用进行了总结,最后对其今后的发展趋势进行了展望,以期为制备大工作范围和高灵敏度的压阻传感器提供参考。

In recent years,flexible piezoresistive sensors have attracted tremendous attention due to their broad application prospects in individual motion and health monitoring.As a new two-dimensional material,MXene has excellent electrical conductivity and hydrophilicity,and is easy to compound with other functional materials.In particular,it is easy to produce micro/nano cracks during the press process due to its brittle structure,so it is considered as a promising candidate for the preparation of high sensitivity piezoresistive sensors.To achieve full-range monitoring of the human body,the piezoresistive sensor needs to satisfy both large working range and high sensitivity.However,the rapid expansion of micro/nano cracks in MXene leads to the rapid destruction of its conductive path,resulting in a smaller working range.To solve this problem,many resear-chers have focused on the construction of micro/nano structures in recent years,trying to maintain the connectivity of the conductive path or slow down the micro/nano crack propagation while the sensing process,and simultaneously achieve the high sensitivity and wide operating range of MXene based sensors.In this paper,the preparation methods of MXene and the sensing mechanism of piezoresistive sensor were summarized.Then,the preparation strategies of flexible piezoresistive sensor based on MXene were reviewed from strain type and pressure type.Meanwhile,the application of MXene-based flexible piezoresistive sensor was summarized.Finally,the future development trend of MXene-based flexible piezoresistive sensor was prospected.It is expected to provide a reference for the preparation of piezoresistive sensor with large working range and high sensitivity.