The Study On The Preparation And Application Of MXene-based High-Performance Pressure Sensor

Sensors can sense the surrounding information and convert it into the desired signal form,providing us with physical,chemical and biological information about our surroundings.Among the various types of sensors,flexible pressure sensors that can convert pressure changes into electronic signals have attracted tremendous attention for their various potential applications in personal health monitoring,disease diagnosis,human motion detection,and intelligent electronic skin（E-skin）.However,the preparation of pressure sensors with high flexibility,lightweight,breathability,favorable biocompatibility,and excellent sensing performance for comfortable and comprehensive human physiological movement monitoring is still a great challenge and highly desired.Herein,we elaborately designed and fabricated a biocompatible and breathable MXene-based piezoresistive sensor with high sensitivity,considering both structural design and raw materials selection.The device is elaborately assembled from a porous polyvinylidene fluoride（PVDF）nanofiber film impregnated with conductive MXene nanosheets（MXene/PVDF）as the sensitive layer,and a porous PVDF nanofiber film with magnetron sputtered Ag interdigital electrode（Ag/PVDF）as the electrode layer,with polyimide（PI）introduced in between as the insulation layer.The conductive MXene/PVDF nanofiber membrane and the Ag/PVDF interdigital electrode nanofiber membrane enable the sensor to demonstrate excellent flexibility,reliable breathability,and favorable biocompatibility.Remarkably,benefitting from the insulation layer,the sensitivity of the sensor is further enhanced(up to 1970.65 k Pa^-1),which is about 13 times that without the insulation layer.Moreover,the sensor also exhibits other excellent characteristics such as rapid response/recovery time（10/20 ms）and excellent cycling stability（10000 cycles）.These superior performances lay a foundation for the application of comprehensive human motion monitoring and pressure spatial distribution detection.Our study provides an effective strategy for fabricating flexible pressure sensors with good comprehensive properties in the field of intelligent wearable electronics.