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Highly oriented pyrolytic graphite (HOPG) is a highly pure and ordered form of synthetic graphite. It is characterised by a low mosaic spread angle, meaning that the individual graphite crystallites are well aligned with each other. The best HOPG samples have mosaic spreads of less than 1 degree.
Method for preparing ultra-smooth wrinkle-free graphene film
This invention provides a method for preparing ultra-smooth, wrinkle-free graphene films, belonging to the field of graphene film preparation technology. The method includes: smoothing the surface of a highly oriented pyrolytic graphite substrate; depositing a copper or nickel atomic layer on the substrate surface by electron beam evaporation; forming an atomically smooth copper or nickel surface by high-temperature treatment of the copper or nickel atomic layer; using a gaseous carbon source, growing a wrinkle-free monolayer graphene film on the atomically smooth copper surface via chemical vapor deposition; or using highly oriented pyrolytic graphite as a solid carbon source, growing a wrinkle-free multilayer graphene film on an atomically smooth nickel surface via a carbon dissolution-precipitation method. This invention solves the technical problem of wrinkle defects that may occur when using existing CVD methods to prepare graphene films.
Owner:UESTC (SHENZHEN) ADVANCED RES INST +1