Study On The Preparation And Application Of MXene Microwrinkles

Microwrinkles is a structure in microscale due to structural instability.Microwrinkles are often used in the fields of optical,electronic sensor devices,special wetting coatings,etc.because of their good structural periodicity,mechanical stretchability,and tribological properties.The rapid,simple and controllable preparation of functional microwrinkles is increasingly favored by researchers.Graphene-like materials?MXene?generally have excellent electrical conductivity,excellent electromagnetic shielding performance and large specific surface area,and are often used in the fields of high-performance supercapacitors,batteries,catalysts,etc.This paper will combine the special structural properties of microwrinkles and the excellent material properties of MXene to try to prepare a functional microwrinkles with certain sensing response properties.The MXene material used in the experiment is titanium aluminum carbide?Ti₃AlC₂?,and LiF+HCl was used as etchant to obtain layered Ti₃C₂T_x.The crystal structure of the etched sample changes significantly,and the Al element in the material after etched is significantly reduced,and the F element appears.Then the layered Ti₃C₂T_x was delaminated in water by ultrasonication to obtain dispersion of sheet Ti₃C₂T_x.The prepared sheet Ti₃C₂T_x disperses well in water.The“strip”shape microwrinkles were prepared by spraying dispersion of Ti₃C₂T_x onto a PDMS polymer film in the state of uniaxial stretch.The morphology of microwrinkles can be changed by controlling the stretched length of PDMS film,and the results show that as the PDMS film becomes longer,the microwrinkles becomes smaller.The experiment results generally correspond to the simulation results simulated by the finite element software ANSYS.The prepared microwrinkles can be used as the sensing base of strain sensor,and the sensor has a good responsivity to finger bending.The“ridge”shape microwrinkles were prepared also by spraying dispersion of Ti₃C₂T_x onto a PU polymer film in the state of blown stretched.The morphology of the microwrinkles can be changed by controlling the blown height of PU film and the amount of Ti₃C₂T_x dispersion.As the PU film is blown higher and the amount of Ti₃C₂T_x dispersion is increased,the wavelength of the microwrinkles is more smaller and the amplitude is more higher.The experiment results of the microwrinkles generally correspond to the finite element simulation.The microwrinkles can be used in the field of flexible pressure sensor,and the detect range of the prepared sensor is 0.005-0.6 N,possessing relative broad detect range,and the sensor is comparably stable.The sensor can also detect sound within certain frequency and intensity range in the detection of sound.