Highly Efficient Light-Driven TiO2-Au Janus Micromotors
Highly Efficient Light-Driven TiO2-Au Janus Micromotors
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高效光驱动 TiO2-Au Janus 微电机
DOI：
10.1021/acsnano.5b05940
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发表时间：
2016-01-01
期刊：
影响因子：
17.1
通讯作者：
Ren, Biye
中科院分区：
文献类型：
--
作者：
Dong, Renfeng;Zhang, Qilu;Ren, Biye
介绍了一种具有无线转向和速度控制的高效光驱动光催化二氧化钛-Au-Janus微电机。与通常需要添加表面活性剂或有毒化学燃料的化学推进微电机不同，无燃料JANUS微电机(直径类似1.0微米)可以在极低的紫外光强度(2.5 x 10(-3)W/cm(2))下在纯水中供电，在40 x 10(-3)W/cm(2)的紫外光强度下，它们可以达到25体长/S的高速，这与普通铂基化学诱导自电泳JANUS微电机相当。光催化推进可以通过入射光调制来开启和关闭。此外，增加光强或添加低浓度的化学燃料H_2O_2(即0.1%)可以加快光催化的TiO2Au微电机的速度。二氧化钛-金光催化微电机具有诱人的无燃料推进性能、快速的运动触发响应、低光能需求和精确的运动控制，具有广泛的实际应用前景。
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 similar to 1.0 mu m) can be powered in pure water under an extremely low ultraviolet light intensity (2.5 x 10(-3) W/cm(2)), and with 40 x 10(-3) W/cm(2), 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 photo catalytic 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.