Preparation And Performance Of A Novel Silver Nanowires/MXene Based Flexible Strain Sensor

With the intelligent development of electronic devices,wearable electronic devices are gradually coming into people’s view.Metallo-carbon nitride（MXene）is a new type of two-dimensional layered material,which combines metal-like conductivity and excellent hydrophilicity,and has a wide range of application prospects in electrocatalysis,capacitors,batteries,etc.The lamellar structure of MXene helps to reduce the contact resistance and surface roughness of AgNWs,and the combination of MXene and AgNWs,combining the advantages of the above two materials,is important for optimize the performance of flexible sensors is of great significance.In this thesis,two flexible strain sensors with different structures and functions were prepared by combining AgNWs and Ti₃C₂T_x-MXene as sensitive materials with flexible substrate materials polydimethylsiloxane（PDMS）and triblock copolymer poly（styrene-ethylene-butene-styrene）（SEBS）,respectively,and the effects of materials and structures on sensor performance were systematically investigated.The specific studies are as follows.1.A flexible pressure sensor was prepared by the template sacrifice method.Using PDMS as the flexible substrate material,AgNWs and Ti₃C₂T_x-MXene conductive fillers were attached to the inner wall of PDMS sponge through ultrasonic soaking and drying processes to form a conductive pathway,and assembled with electrodes to prepare the AgNWs/MXene/PDMS flexible pressure sensor,and its performance was characterized.The test results show that the prepared pressure sensor can reach a sensitivity of 7.9 under 50%strain and can maintain stable sensing performance for more than 1000 cycles.2.A flexible tensile sensor was prepared by dip-coating method.Using SEBS as the flexible substrate material,SEBS was completely dissolved in cyclohexane and the solvent was evaporated at room temperature to form a SEBS film.The conductive filler was then added to the SEBS/cyclohexane mixture,stirred well,and coated on both sides of the SEBS film prepared in advance.The prepared stretch sensor was tested to stretch up to 500%of the original length,and had an ultra-high sensitivity and high linearity of up to 124.9 in the interval of 0-100%,and could maintain a stable sensing efficiency within 200 cycles.