Highly Efficient Light-Driven TiO2–Au Janus Micromotors

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• 作者：Renfeng Dong ; Qilu Zhang ; Wei Gao ; Allen Pei ; Biye Ren
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：January 26, 2016
• 年：2016
• 卷：10
• 期：1
• 页码：839-844
• 全文大小：360K
• ISSN：1936-086X

文摘

A highly efficient light-driven photocatalytic TiO₂–Au Janus micromotor with wireless steering and velocity control is described. Unlike chemically propelled micromotors which commonly require the addition of surfactants or toxic chemical fuels, the fuel-free Janus micromotor (diameter ～1.0 μm) can be powered in pure water under an extremely low ultraviolet light intensity (2.5 × 10^–3 W/cm²), and with 40 × 10^–3 W/cm², they can reach a high speed of 25 body length/s, which is comparable to common Pt-based chemically induced self-electrophoretic Janus micromotors. The photocatalytic propulsion can be switched on and off by incident light modulation. In addition, the speed of the photocatalytic TiO₂–Au Janus micromotor can be accelerated by increasing the light intensity or by adding low concentrations of chemical fuel H₂O₂ (i.e., 0.1%). The attractive fuel-free propulsion performance, fast movement triggering response, low light energy requirement, and precise motion control of the TiO₂–Au Janus photocatalytic micromotor hold considerable promise for diverse practical applications.