by Keyword: Fuel-free nanomotors

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Wang, Xu, Sridhar, Varun, Guo, Surong, Talebi, Nahid, Miguel-López, Albert, Hahn, Kersten, van Aken, Peter A., Sánchez, Samuel, (2018). Fuel-free nanocap-like motors actuated under visible light Advanced Functional Materials , 28, (25), 1705862

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.

Keywords: Enhanced Brownian motion, Fuel-free nanomotors, Nanomachines, Self-electrophoresis, Visible light