Preparation And Properties Of Self-power,Flexible And Elastic Electronic Skin Based On PVDF

Electronic skin is a new flexible and extensible sensor-based system,which enables the carriers to perceive various physical,chemical and biological signals.It has become one of the hot topics in the field of medicine,intelligent robot and wearable electronic equipment.The preparation process of electronic skin materials is the key to improving sensitivity.At present,the electronic skin system mainly relies on the integration of miniaturized sensitive devices and flexible substrates to imitate the feeling and touch of human skin,particularly requireing that the sensitive devices have flexibility.However,miniaturized mechanical sensing devices are not flexible and cannot be used under large deformation conditions currently.Therefore,the active force-sensitive materials with high flexibility are designed and prepared based on this problem.According to the sensitivity and flexibility of the sensitive system,the high elastic filament sensitive electronic skin system film with a layer-by-layer and a large specific area can be obtained by the spincoating and the electrospinning process,which realizes tactile sensing under large deformation.The output voltage of the three-layer film was 10 times that of the single-layer film by designing the layer-by-layer structure using spincoating,while the number of layers increasing,the output voltage decreases,which indicates that the sensitivity of the three layers is best.The voltage of the film using electrospinning under unit pressure is 1.25 V,while the voltage of the film using electrospinning under unit pressure is 0.8 V,which means the sensitivity of electrospinning is better than the sensitivity of spincoating.Using the electrospinning film,a keyboard pressure sensor was fabricated with an average output voltage of 1.5V.In order to obtain the film stress field in real time,a stress recognition system is designed to realize the function of dynamic refresh imaging,and the relevant experimental parameters can be set to control the acquisition process at the same time.