Magnetic and meniscus-effect control of catalytic rolled-up micromotors

Rolled-up catalytic micromotors with tubular structures are fabricated by rolling up strained Pt/Co/Ti metallic nanomembranes through selectively etching of the sacrificial lift off resist (LOR). The rolled-up micromotors present distinct motion behaviors in an organic/aqueous mixture fuel compared...

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Bibliographic Details
Published in:Microelectronic engineering 2011-08, Vol.88 (8), p.1792-1794
Main Authors: Li, Jin-Xing, Lu, Bing-Rui, Shen, Zhenkui, Xu, Zhencheng, Li, Hui, Wen, Juanjuan, Li, Zhidong, Qu, Xin-Ping, Chen, Yi-fang, Mei, Yongfeng, Liu, Ran
Format: Article
Language:English
Subjects:
Applied sciences
Catalysis
Catalysts
Catalytic motor
Electronics
Etching
Exact sciences and technology
Fuels
Liquid surfaces
Meniscus-effect
Microelectronic fabrication (materials and surfaces technology)
Micromotors
Microtubes
Motion control
Nanostructure
Rolled-up nanotech
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Titanium
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Summary:Rolled-up catalytic micromotors with tubular structures are fabricated by rolling up strained Pt/Co/Ti metallic nanomembranes through selectively etching of the sacrificial lift off resist (LOR). The rolled-up micromotors present distinct motion behaviors in an organic/aqueous mixture fuel compared to those in a pure aqueous fuel. These self-propelled micromotors can move in pure aqueous fuel with a speed up to several millimeters per second. However, when placed into an organic/aqueous mixture fuel, the micromotors walk on the liquid surface. An intermediate Co layer facilitates a magnetically guided motion of these microtubular motors. The motion at the air–liquid interface can be regulated and suspended by the meniscus-climbing effect. Such meniscus-navigated motion represents a novel approach for regulation of micromotors at the air–liquid interface and opens the door to new and exciting operations of these micro-scale machines.
ISSN:0167-9317
1873-5568
DOI:10.1016/j.mee.2011.01.056