title: Direct imaging of rotational stacking faults in few layer graphene.
abstract: Few layer graphene nanostructures are directly imaged using aberration corrected high-resolution transmission electron microscopy with an electron accelerating voltage of 80 kV. We observe rotational stacking faults in the HRTEM images of 2-6 layers of graphene sheets, giving rise to Moir patterns. By filtering in the frequency domain using a Fourier transform, we reconstruct the graphene lattice of each sheet and determine the packing structure and relative orientations of up to six separate sets. Direct evidence is obtained for few layer graphene sheets with packing that is different to the standard AB Bernal packing of bulk graphite. This has implications toward bilayer and few layer graphene electronic devices and the determination of their intrinsic structure.
authors.affiliation: Department of Materials, Quantum Information Processing Interdisciplinary Research Collaboration, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom. Jamie.warner@materials.ox.ac.uk
authors.forename: Jamie H
authors.initials: JH
authors.lastname: Warner
authors.forename: Mark H
authors.initials: MH
authors.lastname: Rümmeli
authors.forename: Thomas
authors.initials: T
authors.lastname: Gemming
authors.forename: Bernd
authors.initials: B
authors.lastname: Büchner
authors.forename: G Andrew D
authors.initials: GA
authors.lastname: Briggs
mesh_terms: D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing / Q000379:methods*; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012399:Rotation; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D006108:Graphite