Journal
NANO LETTERS
Volume 19, Issue 9, Pages 6221-6226Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b02281
Keywords
2D materials; origami; capillary; microstructures; MoS2
Categories
Funding
- Cornell Center for Materials Research
- NSF MRSEC program [DMR-1719875]
- Air Force Office of Scientific Research [MURI: FA9550-16-1-0031]
- Kavli Institute at Cornell for Nanoscale Science
- University of Chicago MRSEC [NSF DMR-1420709]
- Platform for the Accelerated Realization, Analysis, and Discovery of Interface Materials (PARADIM) [DMR-1539918]
- Samsung Advanced Institute of Technology
- Research Experience for Undergraduates program [DMR-1719875, DMR-1757420]
- NSF GRFP fellowship [DGE-1746045]
- National Science Foundation [NNCI-1542081]
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Small-scale optical and mechanical components and machines require control over three-dimensional structure at the microscale. Inspired by the analogy between paper and two-dimensional materials, origami-style folding of atomically thin materials offers a promising approach for making microscale structures from the thinnest possible sheets. In this Letter, we show that a monolayer of molybdenum disulfide (MoS2) can be folded into three-dimensional shapes by a technique called capillary origami, in which the surface tension of a droplet drives the folding of a thin sheet. We define shape nets by patterning rigid metal panels connected by MoS2 hinges, allowing us to fold micron-scale polyhedrons. Finally, we demonstrate that these shapes can be folded in parallel without the use of micropipettes or microfluidics by means of a microemulsion of droplets that dissolves into the bulk solution to drive folding. These results demonstrate controllable folding of the thinnest possible materials using capillary origami and indicate a route forward for design and parallel fabrication of more complex three-dimensional micron-scale structures and machines.
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