The Preparation Of The Bubble-driven Janus Colloidal Motor And The Study Of Visible Light-controlled Movement

Artificial colloidal motors have the advantages of various types,easy control and large motion scales,show broad application prospects in the fields of precision medicine and environmental remediation.Among the different control mechanisms,the light-controlled mechanism has some advantages compared with others,especially the visible-light controlled method.In this paper,two artificial colloidal motors based on photocatalytic materials are prepared,which can move rapidly under the control of visible light,and realize the effective modulation of the movement by controlling the visible light.Firstly,the melt-impregnation method,high temperature calcination,and magnetron sputtering technology are applied to construct Pt/g-C₃N₄ Janus colloidal motor.The morphology,element distribution,and crystal phase of the micro particles were analyzed using SEM、EDS、XRD analysis.The results showed that the surface of the colloidal motor was graphene phase carbon nitride,Pt is concentrated on one side only.The photoelectric properties of the micro particles were analyzed,and the study found that the Pt/g-C₃N₄ Janus colloidal motor has a stronger photoelectric ability than its base material.The optical ability of the colloidal motor is also studied,and the colloidal motor shows promising visible light absorption capacity.Using the light intensity of the light source and the concentration of hydrogen peroxide substrate as variables to study the influence on the movement behavior of the colloidal motor;switching the blue light source as a control factor,to realize the light-controlled acceleration of the colloidal motor.The Pt/CdS Janus colloidal motor based on cadmium sulfide semiconductor material was prepared by hydrothermal method and magnetron sputtering technology,and its material composition,surface structure and physical and chemical properties were verified through a series of physical and chemical characterization.Due to the structural asymmetry,the colloidal motor can realize rapid self-driving propulsion by generating bubbles on one side.The effects of the intensity of the green and blue light sources and the concentration of hydrogen peroxide on the movement speed and diffusion capacity of the colloidal motor were studied respectively;the influence of light sources of different wavelengths on the movement of the colloidal motor was directly explored by switching the microscope light source filter;In addition,the colloidal motor can be turned“run/stop”periodically under the control of visible light by adjusting the blue light source.In summary,this paper has prepared Pt/g-C₃N₄ Janus colloidal motors and Pt/CdS Janus colloidal motors by the template method.According to their bubble drive mode,the influence of light intensity and fuel concentration on its movement speed and diffusion ability have been explored.In addition,by adjusting the light source,effective control of the movement is realized,which provides a new idea for the artificially efficient control of the colloidal motor.