Visible Light-Driven Micromotor with Incident-Angle-Controlled Motion and Dynamic Collective Behavior
- 2 January 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 37 (1), 180-187
- https://doi.org/10.1021/acs.langmuir.0c02714
Abstract
Light-driven micromotor has become one of the research focuses in the past decade, and its motion behavior is usually controlled by light intensity, polarization, and light wavelength. Herein, the light incident angle is utilized to control the motion behavior of silica/Au/pentacene (SiO2/Au/PEN) spherical Janus micromotor. Under tilted irradiation, a single micromotor shows positive phototactic moving behavior without the addition of external chemical fuels, which relies on the photocatalytic reactions and the self-electrophoresis mechanism. Interestingly, when the incident light is tuned to the vertical angle, the SiO2/Au/PEN micromotor stops moving. Similarly, a number of SiO2/Au/PEN micromotors exhibit the same “on–off” motion change, which is dependent on the light incident angle. More interestingly, the “on–off” motion of the SiO2/Au/PEN microparticles under vertical light irradiation results in the formation of the agglomeration with position and size precisely controlled by light. In addition, the resulting aggregation exhibits light-controlled dynamic migration behavior. The incident angle control thus opens up new opportunities for the motion control of the micromotors for diverse applications.Keywords
Funding Information
- State Administration of Foreign Experts Affairs
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Ministry of Education of the People's Republic of China
- Ministry of Science and Technology of the People's Republic of China (2018YFE0306105)
- Government of Jiangsu Province (SJKY19-2280)
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University
- Jiangsu Higher Education Institutions
- Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University
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