Multiwavelength-Steerable Visible-Light-Driven Magnetic CoO–TiO2 Microswimmers
| Autor: | Byung-Wook Park, Peter A. van Aken, Surong Guo, Varun Sridhar, Metin Sitti |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry Infrared Solar intensity 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease_cause 01 natural sciences Steering control 0104 chemical sciences Magnetic field Wavelength Photocatalysis medicine Optoelectronics General Materials Science 0210 nano-technology business Ultraviolet Visible spectrum |
| Zdroj: | ACS Applied Materials & Interfaces. 12:24149-24155 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c06100 |
| Popis: | While current light-driven microswimmers require high-intensity light, UV light, or toxic fuels to propel them, powering them with low-intensity UV-free visible light without fuels is essential to enable their potential high-impact applications. Therefore, in this study, a new material for light-driven microswimmers in the form of CoO is introduced. Janus CoO-TiO2 microswimmers powered with low-intensity, UV-free visible light inside water without using any toxic fuels like H2O2 is proposed. The microswimmers show propulsion under full spectrum of visible light with 17 times lower intensity than the mean solar intensity. They propel by breaking down water into oxygen and oxide radicals, which enables their potential applications for photocatalysis and drug delivery. The microswimmers are multiwavelength responsive, from the ultraviolet to the infrared region. The direction of swimming changes with the change in the illumination from the visible to UV light. In addition to being responsive, they are wavelength steerable and exhibit inherent magnetic properties enabling magnetic steering control of the CoO-TiO2 microswimmers. Thus, these microswimmers, which are propelled under low-intensity visible light, have direction-changing capability using light of different wavelengths, and have steering control capability by external magnetic fields, could be used in future potential applications, such as active and local cargo delivery, active photocatalysis, and hydrogen evolution. |
| Databáze: | OpenAIRE |
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