Construction Of High-Performance Flexible Humidity Sensor And Research On Its Sensitive Performance

With the development of society,humidity detection has become an important research topic.Humidity measurement and control play important roles in the fields of environmental monitoring,industrial and agricultural production,food storage,and instrument maintenance.The humidity level in the air is also closely related to daily life and human health.Therefore,exploring and developing high-performance humidity sensors with high sensitivity and excellent long-term stability has important practical significance for realizing accurate humidity monitoring,developing industrial and agricultural production capacity,and improving people’s living standards.This paper is devoted to researching high-performance flexible humidity sensor based on PET substrate to realize the improvement of sensor detection performance,and constructing a4×4 humidity sensor array to detect the humidity distribution on the surface of the object to promote its development in practical applications.The main research contents are as follows:the nanomaterials with excellent humidity sensitive properties were selected through theoretical analysis and pre-experiment.The three flexible humidity sensors based on Mo Se₂/Cu WO₄,Ti₃C₂T_x MXene/g-C₃N₄ and g-C₃N₄/PEO hybrid nanomaterials were fabriceted through drop-coating method and spin-coating method.The humidity test platform was built to study the humidity sensitivity performance of the sensors in terms of dynamic switching response,sensitivity,response/recovery characteristics,repeatability,hysteresis and long-term stability.At the same time,the practical application prospects of humidity sensors were studied through human breathing detection,skin surface humidity detection,fingertip non-contact detection and sensor bending test,and the fabricated humidity sensor was cooperated with STM32 single-chip microcomputer and mobile phone display platform to build the real-time humidity detection system.The microscopic morphology,composition and lattice structure of the humidity-sensitive films were analyzed through the characterization techniques of SEM,TEM,XRD,XPS and FTIR and the complex impedance spectroscopy,bode diagram,equivalent circuit model and water molecule adsorption kinetics model were used to reveal the humidity-sensing mechanism of the film sensor from multiple angles.Finally,a 4×4 humidity sensor array was built on the PI flexible substrate,which can identify the position and shape of objects above the sensor array.The study of humidity sensor array played important roles in improving the performance of the sensor and provided new applications for humidity sensors in the fields of environmental detection,health care,and non-contact detection systems.This paper takes"new device-new material-new application"as the research route,and constructs high-performance flexible humidity sensors,builds humidity-sensing performance detection platform and real-time humidity detection system and explores the humidity-sensing performances of the film sensors based on new nanomaterials.It provides theoretical guidance and experimental basis for the research of new humidity detection devices and the development of humidity detection technology.