• Categories:Industry dynamic
• Author:蓝海星
• Origin:公众号：蓝海星智库
• Time of issue:2020-04-29 08:34
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(Summary description) 　　Researchers from the Institute of Physics of the Chinese Academy of Sciences realized the controllable folding of graphene nanostructures with atomic-level precision for the first time and constructed a new type of quasi-three-dimensional graphene nanostructure.   　　Schematic diagram of controllable folding of graphene nanostructures   　　The origami process has been widely used in the fields of architecture, battery design and DNA nanomanufacturing, and has shown significant potential in the preparation and simulation of three-dimensional graphene structures and devices. However, the electrical properties of the curved structure of graphene are easily affected by vacancies, boundaries, etc., and how to accurately fold graphene at the single-atom scale has become a major challenge at present. Researchers use highly ordered pyrolytic graphite as a substrate, and use scanning tunneling electron microscopy probes to fold and unfold the graphene nano-islands on it with atomic-level precision to construct a double-layer graphite with adjustable torsion angles. Alkene stacking structure, and forms a heterojunction with a distinct interface. The study found that adjusting the folding direction can obtain a double-layer graphene with a twist angle of 60° and an accuracy of 0.1°. The unique feature is that the layers are connected by the edge of the tubular nanostructure. Using scanning tunneling electron microscopy and first principles, the atomic structure and localized electronic state of the folded graphene were determined, and it was confirmed that the heterojunction has a different energy band structure. 　　This method is expected to be used in other two-dimensional atomic crystal materials and will promote the development of quantum materials and quantum devices.