Preparation Of Graphene Motor Based On Template Method And Its Application

Self-propulsion milli/micro/nanomotors,as an emerging research field,have attracted more and more attention.Among them,the tube/rod motors have become a research hotspot in the field of milli/micro/nanomotors because of its large surface area which is convenient for functional modification and the effective bubble nucleation and ejection for the efficient propulsion.With the deepening of related research,the research of artificial tube/rod motors has made some progress in various fields.However,the research of tube/rod micro/nanomotors is still in its initial stage,and there are still many problems in the design and development of intelligent micro/nanomotors.For example,the preparation method is complicated,the cost is high,and the motion controllability is poor,which limits the application of micro/nanomotors.It is urgent to develop a simple and rapid tube/rod motor fabrication method.Firstly,using a glass tube as a template,a millimeter-sized reduced graphene oxide/platinum（r GH/Pt）motor was prepared by an one-step hydrothermal method.The motor is self-driven by Pt particles catalyzing hydrogen peroxide（H₂O₂）to decompose to produce O₂,and the speed of the motor increases with the increase of fuel concentration.Under the synergistic effect of the autonomous movement of the motor and the adsorption performance of graphene itself,the r GH/Pt motor can achieve the rapid removal of methylene blue（MB）.And with the lower the MB concentration,the higher the H₂O₂concentration and the more the number of motors,the faster the removal rate of MB can be achieved.In the solution of 10 wt%H₂O₂,18 motors can quickly remove 97.1%of MB（10mg/L）within 30 minutes.In addition,Pt particles can be repetitively anchored to the skeleton of the r GH/Pt motor through in-situ reaction to realize the regeneration of the motor.The fast removal of the target object can still be achieved after multiple cycles.Secondly,using a smaller glass capillary as a template,a micron-sized reduced graphene oxide aerogel（r GA）motor which is driven by near-infrared light was prepared by a simple hydrothermal method.Under the near-infrared laser irradiation,the temperature gradient on both sides of the rod-like structure leads to the Marangoni effect mediated by asymmetric surface tension.Under the Marangoni effect,the motor moves away from the light source.In addition,the speed and direction of the motor can be controlled by adjusting the intensity and irradiation angle of the near-infrared laser.Therefore,the light-driven r GA motor shows its capability in precise control and higher application potentials.