Multi‐Light‐Responsive Quantum Dot Sensitized Hybrid Micromotors with Dual‐Mode Propulsion

Light power: CdS quantum dots/C₆₀ tubular micromotors with chemical/multi‐light‐controlled propulsion and "on‐the‐fly" chemical acceleration capabilities are described. The built‐in accelerating optical system allows for the control of the velocity over the entire UV/Vis light spectrum by modulating the catalyst surface chemistry.

Abstract

CdS quantum dots/C₆₀ tubular micromotors with chemical/multi‐light‐controlled propulsion and "on‐the‐fly" acceleration capabilities are described. In situ growth of CdS quantum dots on the outer fullerene layer imparts this layer with light‐responsive properties in connection to inner Pt, Pd or MnO₂ layers. This is the first time that visible light is used to drive bubble‐propelled tubular micromotors. The micromotors exhibit a broad absorption range from 320 to 670 nm and can be wirelessly controlled by modulating light intensity and peroxide concentration. The built‐in accelerating optical system allows for the control of the velocity over the entire UV/Vis light spectra by modulating the catalyst surface chemistry. The light‐responsive properties have been also exploited to accelerate the chemical dealloying and propulsion of micromotors containing a Cu/Pd layer. Such dual operated hybrid micromotors hold considerable promise for designing smart micromachines for on‐demand operations, motion‐based sensing, and enhanced cargo transportation.

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