Study On Preparation And Health Monitoring Of MXene/Ink Composites

The new two-dimensional material MXene,because of its unique lamellar structure and excellent electrical performance,is brilliant in the field of sensor.Sensors made of MXene conductive film or MXene composite conductive material are widely used in intelligent monitoring,human-computer interaction and other aspects.In this paper,a new MXene/ink conductive sensing material is reported,which can be used for composite material damage detection and human health monitoring.Ti3C2Tx-MXene material was prepared by selective etching of Ti3AlC2 with HCl+LiF solution,because its surface contains a large number of oxygen-containing active functional groups,is very soluble in water and organic solvents,and has good biocompatibility.The prepared Mxene was combined with the ink to design a new conductive sensing material,and a low percolation threshold was obtained.The mass fraction of MXene in the ink was only 3.6 wt%.When the mass fraction of MXene reaches 9 wt%,a stable interconnected conductive network channel can be formed.The MXene/ink nanosensor material has excellent conductive properties,which are inseparable from the uniform dispersion of MXene in the ink.Considering the factors such as viscosity,adhesion,curing time,etc.,the ratio of MXene to ink mass fraction is 1:1,and 40 microns is selected as the coating layer thickness index to obtain the MXene/ink conductive sensing material with the best comprehensive performance.The MXene/ink conductive sensing material was arranged on the surface of the glass fiber composite board by spray printing technology,and the sensitivity(GF)116.6(strain:0-0.477%)and 554.3(strain:0.477%-1.37%)were obtained.The linearity between the resistance change rate and strain was 0.992 and 0.996,respectively.The excellent strain sensor had more than 5000 cycles stability under 1%strain condition.The MXene/ink conductive sensing materials were arranged on the nylon fabric surface by spray printing technology,and the sensitivity(GF)of 27.2(strain:0-25%)and 170.9(strain:25%-29.7%)were obtained.The linearity between the resistance change rate and strain was 0.967 and 0.986,respectively,and the excellent flexible sensor had more than 3000 cycles stability under 20%strain condition.It can accurately monitor human limb behavior and physiological signals such as finger bending,elbow bending and blood pressure measurement.