Motion Behaviors of Palladium-Platinum Based Janus Micromotors
To study the driving mechanism of bimetallic micro motors,polystyrene(PS)@palladium Pd-platinum Pt Janus micromotors were prepared by magnetron sputtering technology.The structure,morphology and motion behavior of the micromotors were characterized by scanning electron microscopy and optical microscopy,and the driving mechanism of the micromotors was speculated and verified by comparative experiments and numerical simulation.The results show that the PS@Pd-Pt micromotor is composed of Pd and Pt bimetallic layer half-coated on the surface of PS microsphere.It has a Janus structure with a diameter of about 2 μm.PS@Pd-Pt Janus micromotor in H2O2 solution starts to move in a posi-tive direction towards the PS side,then the speed decreases gradually,and then spontaneously turns to move in a reverse direction towards the Pd-Pt bimetallic side.The positive motion of the micromotors is driven by the non-ionic self-diffu-siophoresis generated by Pt catalyzed H2O2 and the self-electrophoresis caused by the uneven thickness of Pt layer,while the reverse motion is driven by the self-electrophoresis formed by the external Pt and internal Pd bimetal.
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