Light-Activated, Multi-Semiconductor Hybrid Microswimmers
Light-Activated, Multi-Semiconductor Hybrid Microswimmers
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DOI：
10.1002/smll.201801860
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发表时间：
2018-08-09
期刊：
影响因子：
13.3
通讯作者：
Gibbs, John G.
中科院分区：
文献类型：
--
作者：
O'Neel-Judy, Etude;Nicholls, Dylan;Gibbs, John G.
使用动态制造工艺，开发了由两种不同的半导体二氧化钛（TiO 2）和氧化亚铜（Cu 2 O）制成的混合光活化微泳体，其中每种材料占据多组分颗粒的不同部分。结构化光激活的microswimmer仅由二氧化钛或氧化铜被观察到驱动过氧化氢和水最有力的紫外线或蓝光下，分别，而混合结构由这两种材料制成的表现出波长依赖性的运动模式，由于不同的响应，每个光催化剂。还发现，混合颗粒在单独的水中被激活，这是在由单一半导体制成的颗粒中没有观察到的行为，因此，该系统可以开辟一类新的利用半导体异质结的无燃料光敏胶体。这里提出的TiO 2/Cu 2 O混合微游泳器只是一个例子，一个更广泛的方法，诱导不同的运动模式在一个单一的光激活粒子，这是不限于本研究中提出的特定的几何形状和材料。
Using a dynamic fabrication process, hybrid, photoactivated microswimmers made from two different semiconductors, titanium dioxide (TiO2) and cuprous oxide (Cu2O) are developed, where each material occupies a distinct portion of the multiconstituent particles. Structured light-activated microswimmers made from only TiO2 or Cu2O are observed to be driven in hydrogen peroxide and water most vigorously under UV or blue light, respectively, whereas hybrid structures made from both of these materials exhibit wavelength-dependent modes of motion due to the disparate responses of each photocatalyst. It is also found that the hybrid particles are activated in water alone, a behavior which is not observed in those made from a single semiconductor, and thus, the system may open up a new class of fuel-free photoactive colloids that take advantage of semiconductor heterojunctions. The TiO2/Cu2O hybrid microswimmer presented here is but an example of a broader method for inducing different modes of motion in a single light-activated particle, which is not limited to the specific geometries and materials presented in this study.