Research On The Fabrication Of Graphene Intelligent Robots And Their Multi-field Coupled Manipulation

Nowadays,with the rapid development of intellectualization,the intelligent micro-mechanical devices which produce mechanical deformation as a response to external stimuli have attracted considerable research interests.Traditional micro-mechanical systems can bend and rotate components to complete specific actuations.With the rapid development of materials science and device manufacturing methods,intelligent devices made of intelligent materials have emerged consequently.Flexible materials,such as polymers and graphene,have presented their own unique advantages:easy to be processed,good flexibility,which makes their application in micro-actuators smart and can be manipulated in various manners.However,most studies are limited to single driving strategy,and the obtained actuators can only perform one specific motion.In this paper,the multi-field coupled driving method of small robot is realized through adding nanoparticles with different responsive characteristics to graphene materials and designable laser treatment.The main achievements are as follows:?1?Light-driven plasmonic-assisted graphene robot.By combining graphene oxide with gold nanorods whose longitudinal surface plasmon resonance peak can be regulated,the photothermal conversion efficiency of the actuation system can be improved and the response of the device can be equipped with wavelength-selective properties.The thermal conductivity of the composites can be modified by local reduction of graphene oxide through laser scribing.The bending degree can be improved significantly and the response time can be accelerated.Through proper design of the device,the crawling process of the mini-spider robot,the catching process of flytrap,and the bending control of each joint of the artificial hand are finally demonstrated.?2?Magnetism and light double-field-coupled manipulation of the multi-directional movement of the crawling robot.By combining superparamagnetic Fe₃O₄ nanoparticles with graphene material,the gravity center of the device can be induced to shift by changing the direction of external magnetic field intensity.Coupling with the light response characteristics of the composite material,the mini-crab robot can crawl with controllable direction.?3?Magnetism,light and moisture field coupled manipulation of the multi-mode motion of the robotGraphene oxide is humidity sensitive,and possesses photothermal dehydration property.So that it could realize bi-directional bending performance.By adding magnetic nanoparticles into graphene oxide material and using the method of gradient assembly induced by external magnetic field,the optical,moisture,and magnetic field coupling operation of materials can be realized,and thus multiple modes of motion such as movement,bending,capturing,releasing,and rotation can be performed.Through proper design,the remote non-contact transfer control of the target object is achieved.?4?A biomimetic water strider with controllable motion manipulated by coupling of light,humidity and surface tension.Water striders can walk and jump freely on the water surface,which is achieved through their light weight,superhydrophobic structure of legs,and gliding motion.Considering the humidity saturation property on water surface,the biomimetic water strider could be controlled by coupling light,humidity and surface tension.