Fuel‐Free Nanocap‐Like Motors Actuated Under Visible Light,Advanced Functional Materials

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Fuel‐Free Nanocap‐Like Motors Actuated Under Visible Light
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-15 , DOI: 10.1002/adfm.201705862
Xu Wang ₁ , Varun Sridhar ₁ , Surong Guo ₂ , Nahid Talebi ₂ , Albert Miguel-López ₁ , Kersten Hahn ₂ , Peter A. van Aken ₂ , Samuel Sánchez _{1,

3,

4}

Affiliation

The motion of nanomotors triggered by light sources will provide new alternative routes to power nanoarchitectures without the need of chemical fuels. However, most light‐driven nanomotors are triggered by UV‐light, near infrared reflection, or laser sources. It is demonstrated that nanocap shaped Au/TiO₂ nanomotors (175 nm in diameter) display increased Brownian motion in the presence of broad spectrum visible light. The motion results from the surface plasmon resonance effect leading to self‐electrophoresis between the Au and TiO₂ layers, a mechanism called plasmonic photocatalytic effect in the field of photocatalysis. This mechanism is experimentally characterized by electron energy loss spectroscopy, energy‐filtered transmission electron microscopy, and optical video tracking. This mechanism is also studied in a more theoretical manner using numerical finite‐difference time‐domain simulations. The ability to power nanomaterials with visible light may result in entirely new applications for externally powered micro/nanomotors.

中文翻译：

在可见光下启动的无燃料的类似Nanocap的电动机

由光源触发的纳米电动机的运动将提供新的替代途径，无需化学燃料即可为纳米结构提供动力。但是，大多数光驱动纳米电机是由紫外线，近红外反射或激光源触发的。结果表明，在宽光谱可见光的存在下，纳米帽形的Au / TiO ₂纳米电动机（直径175 nm）显示出增加的布朗运动。该运动是由表面等离振子共振效应导致的，导致Au和TiO ₂之间的自电泳层，在光催化领域被称为等离激元光催化作用的机制。该机制的实验特点是电子能量损失谱，能量过滤透射电子显微镜和光学视频跟踪。还使用数值有限差分时域仿真以更理论的方式研究了这种机制。利用可见光为纳米材料提供动力的能力可能会为外部供电的微型/纳米电机带来全新的应用。

更新日期：2018-01-15

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