Construction And Performance Of Flexible Tensile Strain Sensors Based On FeNWs

Among them,the qusetion that special requirements of fully satisfying the hand and foot movements of the robot can not quickly achieve intelligence and human-computer interactiont was solved the flexible strain sensing technology,which has great research significance and engineering application value.However,the current mainstream research on flexible strain sensors based on silver nanowires,copper nanowires and carbon nanotubes still has the problems of not being able to take into account high sensitivity,large range,small hysteresis and low cost manufacturing.the sensitivity based on magnetic nanowire materials was expected to improve this situation through related research and analysis,and the idea of Fe NWs was proposed in the field of sensing.This article takes Fe NWs flexible tensile strain sensor as the research object.It was passed indepth study of sensitive units,optimization of construction process,design of sensing structure,a combination of theory and experiment,which are used to explore the performance of the sensor and break through.The current difficulties provide new solutions for improving the status quo.The research contents of this article are as follows:1.In view of the current technical difficulties in obtaining Fe NWs that were easy to disperse and have a high aspect ratio,using the characteristics of Fe NWs with high saturation magnetization,the high-quality Fe NWs were synthesized by innovatively adopting magnetron construction assisted in-situ reduction method.And systematically studied the influence of different influencing factors on the size of Fe NWs,optimized the synthesis parameters,and provided the best core sensitive elements for the construction of subsequent sensors.2.In view of the problems of high process requirements and complex structure in the current construction,a sandwich structure flexible tensile strain sensor is constructed by a simple and easy-to-operate method.And from the perspective of macro and micro analysis respectively,the methods of electron tunneling and percolation theory are used to establish the sensor model of the sensor.The model shows that the surface density of Fe NWs has a great influence on the output resistance,and the relationship between the length of the tensile change and the output resistance is theoretically obtained.3.According to the above micro-mechanism,the performance of Fe NWs flexible tensile strain sensors with different areal densities was explored,build an experimental platform,and their electrical and mechanical properties were tested.The experiment showed that as the strain increases,the different areal densities of Fe NWs are flexible The resistance value of the sensor increases;the greater the area density of Fe NWs,the higher the sensitivity and the lower the linearity.Among them,the flexible tensile strain sensor with two layers of Fe NWs coating has the best sensing performance: it has a nonlinear errorlower 2.1%,higher sensitivity 53,57% strain range in a wider working range,good repeatability and stability,which showing good electrical properties and strength mechanical properties.Through the circuit design and the test of the host computer,a demonstration system was constructed to speed up the application process of human-computer interaction,and the sensing application of Fe NWs flexible tensile strain sensor was initially obtained.