Catalytic Iridium-Based Janus Micromotors Powered by Ultralow Levels of Chemical Fuels

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• 作者：Wei Gao ; Allen Pei ; Renfeng Dong ; Joseph Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：February 12, 2014
• 年：2014
• 卷：136
• 期：6
• 页码：2276-2279
• 全文大小：258K
• ISSN：1520-5126

文摘

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^鈥?) in a 0.001% hydrazine solution due to osmotic effects. Such a low fuel concentration represents a 10鈥?00-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.