MXene Flexible Pressure Sensor Jet Printing Production And Performance Research

Flexible pressure sensors has been widely applied in medical and health,human-computer interaction,environmental monitoring and other related areas based on its function as a key way and means to monitor and transmit pressure signals.At present,there exist such disadvantages as complex manufacturing processes,long cycle times,high costs,and low sensitivity.Therefore,The main challenge and complex issue for sensor research are focused on improving the performance indicators of pressure sensors such as high sensitivity and high adaptability.In this regard,this paper proposes a piezoresistive flexible pressure sensor with MXene（Metal carbides or metal nitrides with two-dimensional layered structure）as the active layer with the adoption of jet printing technology and it involves the following works:（1）The working theory of the piezoresistive flexible pressure sensor is analyzed by taking the piezoresistive effect as the starting point.The piezoresistive function relationship equation of the flexible pressure sensor with MXene as the active material is derived,and a significant analysis to establish a mathematical model with statistical significance is conducted.In addition,correctness of the piezoresistance relationship is tested through experiments with the mathematical model,and the influence law between pressure and deformation,resistance value and deformation,and resistance value and pressure parameters are finally obtained.（2）With the adoption of the HF etching method to make MXene functional ink,then prepare and characterize the sensor active layer material,and the surface morphology of the sample is analyzed.The spray printing experiment of the active layer of the sensor with the MXene solution as the printing material was accomplished on the piezoelectric on-demand experimental platform.The process parameters of jet printing during the experiment（including jet printing frequency,platform moving speed,printing layer number,voltage amplitude,back pressure,printing distance,heating temperature）and its influence on the printing effect are systematically studied for the determination of the ideal process parameters for stable printing:the jet printing frequency is 600 Hz,the platform moving speed is 15 mm/s,and the number of jet printing layers is 20.（3）After investigating the pressure performance with a flexible pressure sensor test platform,the test results shows that the MXene flexible piezoresistive pressure sensor based on the piezoelectric on-demand printing process has a sensitivity of1.44×10^-1k Pa^-1and hysteresis of 14.09%,the cyclic stability can reach 300 times,and the response time and recovery time are respectively 82 ms and 110 ms.In addition,the sensor has been proved that the device can be applied in the areas of medical health monitoring and wearable electronics.through practical application experiments such as throat swallowing test and finger bending test.