High Performance Flexible Tactile Sensor Based On MXene

As the largest organ of the human body,the most important function of the skin is its tactile perception ability.This is the most important way for humans to perceive physical and chemical information such as pressure,temperature,humidity and the shape of objects in the external environment.Inspired by skin,the bionic electronic skin was developed by researchers and applied to human-computer interaction,wearable medical devices,intelligent robots and other fields.The most important part of the bionic electronic skin is the tactile sensor with tactile sensing function,therefore,the research on tactile sensor is very important.At present,tactile sensors based on different materials,different device structures and sensing mechanisms have been developed.Some of these tactile sensors have high sensitivity,some have short response time,and others have good flexibility and stretchability,but only having one or two advantages does not meet the needs of practical applications.Therefore,it is of great significance to develop a tactile sensor with low cost,good biocompatibility,simple preparation process and good comprehensive performance.Based on the current research status at home and abroad,this paper proposes a tactile sensor based on Ti₃C₂ MXene film.The film has a layered accordion-like structure.The piezoresistive test proves that the film has good piezoresistance characteristic.On the basis of this experiment,this paper proposes two flexible pressure sensors based on Ti₃C₂ MXene materials in response to the existing problems in the current research on tactile sensors,and our researches are carried out from the aspects of manufacturing process and performance test respectively.In view of the poor comprehensive performance of current tactile sensors,this work designed a Ti₃C₂ MXene/natural microcapsule composite film with interlocking structure by imitating the structure of human skin,and fabricated a high-performance flexible tactile sensor.The sensitivity of the sensor is 9.4 times higher than that of the Ti₃C₂ MXene film tactile sensor,and it has a lower detection limit of only 8 Pa and a cycle stability of up to 5000 times.In addition,the flexible sensor can also be used for joint movement,voice recognition,and pulse detection.In order to solve the problem of the single function of the flexible tactile sensor,we introduced a hydrophilic chitosan material into the Ti₃C₂ MXene material,and successfully fabricated a Ti₃C₂ MXene/chitosan composite film multifunctional tactile sensor.It not only responds well to pressure,has a larger monitoring range,but is also sensitive to humidity.It can accurately distinguish different relative humidity conditions at room temperature,work stably after long-term storage,and has a good long-term stability.Finally,we attached the device to the human body and demonstrated the device's detection of physiological signals of pressure and humidity.