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Catalytic iridium-based Janus micromotors powered by ultralow levels of chemical fuels.

Journal of the American Chemical Society (2014-01-31)
Wei Gao, Allen Pei, Renfeng Dong, Joseph Wang
ABSTRACT

We describe catalytic micromotors powered by remarkably low concentrations of chemical fuel, down to the 0.0000001% level. These Janus micromotors rely on an iridium hemispheric layer for the catalytic decomposition of hydrazine in connection to SiO2 spherical particles. The micromotors are self-propelled at a very high speed (of ~20 body lengths s(-1)) in a 0.001% hydrazine solution due to osmotic effects. Such a low fuel concentration represents a 10,000-fold decrease in the level required for common catalytic nanomotors. The attractive propulsion performance, efficient catalytic energy-harvesting, environmentally triggered swarming behavior, and magnetic control of the new Janus micromotors hold considerable promise for diverse practical applications.

MATERIALS
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Product Description

Sigma-Aldrich
Hydrazine solution, 35 wt. % in H2O

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