Study On The Fabrication And Application Of Sensing Materials And Microstructures Based On MXene

MXene has received a lot of attention with its excellent properties.As a kind of two dimensional materials,it can be used in many fields,such as high-performance batteries,electromagnetic interference shielding and biomedicine.Ti₃C₂T_x is the most widely used MXene material because of its easy preparation and excellent performance.However,these materials have the disadvantages of easy oxidation and sensitivity limitation,which is not conducive to their application under special conditions.In this paper,a series of paper chips with near-infrared response and microwrinkles pressure sensors with detection ability for micro pressure were prepared by blending modification and microstructure processing of Ti₃C₂T_x,which is based on the excellent photothermal conversion ability and conductivity of Ti₃C₂T_x.This paper is mainly developed from the following two aspects:（1）Using ethylene glycol and choline chloride as hydrogen bond donors and acceptors,a green and environment-friendly deep eutectic solvent（DES）was prepared by blending method.DES was mixed with Ti₃C₂T_x.XRD and XPS tests confirmed that DES formed a passive film successfully on the surface of Ti₃C₂T_x and DES-Ti₃C₂T_x with certain antioxidant ability was obtained.By mixing the above DES-Ti₃C₂T_x with clay,a pencil lead with good writing performance on any substrate was prepared.The best process of preparing pencil lead was also discussed,and paper chips were prepared by direct-writing.Depending on the excellent photothermal conversion performance of Ti₃C₂T_x and the ionic conductivity of DES,the paper-based sensor has sensitive response and stability to near infrared light.The sensing performance of paper chip was tested by electrochemical workstation and infrared camera,the maximum current change rate of the paper-based sensor with the width of 3 mm reachs204%,and the maximum surface temperature reachs 183.4℃.（2）The thin metal film is sputtered on the surface of the PDMS substrate under tensile state,and then the pre-strain in the flexible substrate is slowly released.Due to the mismatch between the modulus of the flexible substrate and the hard film,the micron-scale periodic wrinkle structure was generated.The wavelength and amplitude of microwrinkles can be controlled by adjusting the degree of prestrain and magnetron sputtering time.With the increase of prestrain degree,the wavelength of microwrinkles decreases and the amplitude increases.With the increase of sputtering time,the wavelength and amplitude of microwrinkles increase.A piezoresistive pressure sensor is obtained by spraying Ti₃C₂T_x on the surface of microwrinkles and assembling face to face.Finally,its pressure response performance was tested by electrochemical workstation and small tension machine,this sensor has sensitive and stable response to micro-pressure,and the minimum detection limit is 50 Pa and the maximum detectable limit is 1000 Pa,and it has good stability（100 cycles）.In the future it can be used in the detection of physiological signals of human body.