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. 2021 Apr 20;12(4):465. doi: 10.3390/mi12040465

Figure 7.

Figure 7

(a) TPP printed doughnut swimmer. Upper panel: High-resolution transmission electron microscope (HRTEM) and SEM image of doughnut simmer with two different surface coatings. The bottom of the right swimmer is “cut off” at the bottom to provide a stable base during printing and the metal evaporation. Lower panel: A graph representing the propulsion velocity dependence on the concentration of hydrogen peroxide. Scale bars: 3 μm. Reproduced with permission from [101], Copyright © 2019, Springer nature. (b). Schematic diagrams of fabrication of tubular micro/nanomotors. Upper panel: SEM image of an array of microtubes on glass substrate fabricated by 3D-DLW lithography. Lower panel: Model of a rocket in the macro world, showing schematic diagram of a tubular microrocket and SEM images of tubular micro/nanomotors with a similar structure to rocket boosters inspired by a macro rocket. Reproduced with permission from [102], Copyright © 2019 Wiley.