Abstract
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.
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