title: Grain boundary mapping in polycrystalline graphene.
abstract: We report direct mapping of the grains and grain boundaries (GBs) of large-area monolayer polycrystalline graphene sheets, at large (several micrometer) and single-atom length scales. Global grain and GB mapping is performed using electron diffraction in scanning transmission electron microscopy (STEM) or using dark-field imaging in conventional TEM. Additionally, we employ aberration-corrected TEM to extract direct images of the local atomic arrangements of graphene GBs, which reveal the alternating pentagon-heptagon structure along high-angle GBs. Our findings provide a readily adaptable tool for graphene GB studies.
authors.affiliation: Department of Physics and Center of Integrated Nanomechanical Systems, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Kwanpyo
authors.initials: K
authors.lastname: Kim
authors.forename: Zonghoon
authors.initials: Z
authors.lastname: Lee
authors.forename: William
authors.initials: W
authors.lastname: Regan
authors.forename: C
authors.initials: C
authors.lastname: Kisielowski
authors.forename: M F
authors.initials: MF
authors.lastname: Crommie
authors.forename: A
authors.initials: A
authors.lastname: Zettl
mesh_terms: D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing / Q000379:methods*; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D010316:Particle Size; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D006108:Graphite