期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 27, 页码 8110-8114出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201803457
关键词
chemical propulsion; Janus micromotors; optical brakes; photocatalytic reactions
资金
- Defense Threat Reduction Agency Joint Science and Technology Office for Chemical and Biological Defense [HDTRA1-14-1-0064]
- China Scholarship Council (CSC)
Hybrid micromotors capable of both chemically powered propulsion and fuel-free light-driven actuation and offering built-in optical brakes for chemical propulsion are described. The new hybrid micromotors are designed by combining photocatalytic TiO2 and catalytic Pt surfaces into a Janus microparticle. The chemical reactions on the different surfaces of the Janus particle hybrid micromotor can be tailored by using chemical or light stimuli that generate counteracting propulsion forces on the catalytic Pt and photocatalytic TiO2 sides. Such modulation of the surface chemistry on a single micromotor leads to switchable propulsion modes and reversal of the direction of motion that reflect the tuning of the local ion concentration and hence the dominant propulsion force. An intermediate Au layer (under the Pt surface) plays an important role in determining the propulsion mechanism and operation of the hybrid motor. The built-in optical braking system allows on-the-fly control of the chemical propulsion through a photocatalytic reaction on the TiO2 side to counterbalance the chemical propulsion force generated on the Pt side. The adaptive dual operation of these chemical/light hybrid micromotors, associated with such control of the surface chemistry, holds considerable promise for designing smart nanomachines that autonomously reconfigure their propulsion mode for various on-demand operations.
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