Tactile Sensor And Artificial Skin Based On Graphene Film

Bionic electronic skin with full flexibility and wearability is an important medium for intelligent robot to communicate with the outside environment.It is an electronic or electronic system that uses sensor technology,microelectromechanical technology and new materials to mimic human skin perception and adjustment functions.As the most important part of biomimetic electronic skin,tactile sensors are mainly used to imitate the tactile perception of human skin.It is of great significance to the research of intelligent robots and bionic electronic skin.However,the limitations of the existing tactile bionic electronic skin in sensitivity affect the performance of the electronic skin performance.To solve this problem,we presented a new flexible tactile sensor based on graphene film and a flexible electronic skin based on the sensor,which has the advantages of high sensitivity,fast response time and multiscale measurement range.Firstly,we discussed the background,research significance of the flexible tactile bionic skin and investigated the development status of flexible tactile sensors and electronic skin at home and abroad in this paper.On the basis,we proposed a new flexible tactile sensor based on graphene film and its array of tactile tactile bionics.Secondly,we measured the piezoresistive properties and studied the micro principle of the piezoresistive properties of graphene film and analyzed the factors that affects the piezoresistive properties of this film,which provided a theoretical basis for the preparation of graphene films with high sensitive piezoresistive properties.Then,we designed the micro nano structure of the flexible tactile sensor based on the functional characteristics of the human skin tactile receptor,selected and prepared the flexible material and sensitive film of the sensor in accordance with the requirements of this project,which we prepared the samples of the sensor.Thirdly,Then we designed the micro pressure experimental measurement platform and analyzed the static and dynamic performance of the new tactile sensor.Finally,we designed the array of the tactile sensor unit and analyzed the performance of the array of tactile bionic skin by experiments.The experimental results show that the change of the resistance value of the graphene film is linearly related to the applied pressure and the characteristics of the PET(Polyethylene Terephthalate)have an effect on the piezoresistive properties of graphene,which the softer of the PET film,the more conducive to the enhancement of the sensitivity of the graphene film,and the size of the graphene film has little effect on the sensitivity..We exhibited that the flexible tactile sensor in this paper has excellent performance,such as the small size of5 mm ? 7mm ? 1mm,the range of 0-600 k Pa pressure measurement and the minimum precision of 40 Pa and realized 4 measurement span in full measurement span,the loading response time is 10 ms,the unloading response time is 20 ms,and the whole process repeatability error is 4.92%.At the range of 0-4k Pa,the tactile sensor show that the sensitivity is 10.56 W/ k Pa,the linearity is 3.28%,the hysteresis error is 5.87%.At the range of 4-600 k Pa,the sensitivity is 0.113 W/ k Pa,the linearity is 4.17%,and the hysteresis error is 5.52%.The arrayed flexible tactile bionic electronic skin has showing the outstanding ability to measure the position and size of the external force,and can detect the shape of the target objects.This result shows that this tactile biomimetic electronic skin can simulate the function of human skin tactile perception system.The results show that we designed flexible tactile sensor and its array electronic skin have the characteristics of high sensitivity,wide measurement range,fast response speed and good stability.The electronic skin can imitate the functions of human skin tactile sensing system,which has important application prospects in biological research,medical diagnosis,robot and so on.