Humidity Sensors With Fast Response Based On MXene-Ti₃C₂T_x And MXene-Ti₃C₂T_x/Ag

Humidity is a physical quantity indicating the degree of dryness in the atmosph ere.People have specific requirements for humidity and temperature in many aspect s of production and life.Monitoring and controlling humidity are of great significan ce of industrial manufacturing,agricultural planting,semiconductor,cargo transport ation,textile and other aspects.With the development of science and technology,pe ople have higher requirements for humidity monitoring.It is necessary to use many new materials to develop and fabricate humidity sensors with high sensitivity,fast r esponse,wide range of humidity measurement and long-term stability.In recent yea rs,with the development of two-dimensional nanomaterials and technology,researc hers pay more attention to two-dimensional nanomaterials and composite materials.As a new two-dimensional material,MXene-Ti3C2 Tx is rich in hydrophilic function al groups-OH and-F during the preparation of materials.A large number of hydrophilic functional groups enable MXene-Ti3C2 Tx to be a high performance humidity sensitive material.In this paper,a new two-dimensional material and its M Xene-Ti3C2Tx/Ag composites were used to prepare humidity-sensitive thin films,a nd their material characterization and humidity-sensitive properties were tested.The main contents of this paper are as follows:1.Based on the new two-dimensional material MXene-Ti3C2 Tx,a humidity se nsor with fast response and high sensitivity was prepared.Humidity sensitive films were prepared by dropping MXene-Ti3C2 Tx dispersions with different concentratio ns of isopropanol.TEM,FTIR,XRD and contact angle are commonly used to characterize the materials.The results show that there are a large number of hydrophilic functional groups of the surface of the humidity sensitive film,which is a good material for preparing humidity sensors.The response recovery time of the humidity sensor based on MXene-Ti3C2 Tx is 127 ms and 384 ms respectively.Usin g the fast response characteristics of the sensor,we fabricated a humidity sensor arr ay of the PCB board and applied the sensor to non-contact gesture recognition.2.A humidity sensor with high sensitivity was fabricated based on MXene-Ti3C2 Tx composite Ag nanoparticles.By doping Ag nanoparticle dispersions with diffe rent volumes of the same volume of MXene-Ti3C2 Tx dispersions,different concentr ations of MXene-Ti3C2Tx/Ag composites were formed.The humidity sensitive film was also prepared by dropping coating.The humidity-sensitive properties of MXen e-Ti3C2 Tx and MXene-Ti3C2Tx/Ag composites were tested,characterized and com pared.The results showed that MXene-Ti3C2Tx/Ag composites exhibited stronger h umidity-sensitive properties.3.A high sensitive humidity sensor was fabricated based on the hydrophilic tre atment of MXene-Ti3C2 Tx thin film using common surface treatment technology in laboratory.The MXene-Ti3C2 Tx films were treated with Plasma and UV/O3 respect ively to improve their hydrophilic properties...