Asymmetric Pt/Au coated catalytic micromotors fabricated by dynamic shadowing growth

Asymmetric Pt/Au coated catalytic micromotors are fabricated by a dynamic shadowing growth method, and the exposed Au surface area $A$ is changed systematically. The average moving speed $u$ is found to follow the scaling relationship $u∝A3/2$⁠, which agrees with the self-electrophoresis mechanism. Motion behaviors of micromotors with similar sizes and morphologies operating under a non-self-electrophoresis mechanism are compared with the Pt/Au micromotors, and in general, the self-electrophoresis mechanism gives higher activity for motors with similar sizes and morphologies.