Formation of Klein Edge Doublets from Graphene Monolayers.
With increasing possibilities for applications of graphene, it is essential to fully characterize the rich topological variations in graphene edge structures. Using aberration-corrected transmission electron microscopy, dangling carbon doublets at the edge of monolayer graphene crystals have been observed. Unlike the single-atom Klein edge often found at zigzag edges, these carbon dimers were observed in various edge structure environments, but most frequently on the more stable armchair edges. Observation of this Klein edge doublet over time reveals that its existence enhances the stability of armchair edges and is a route to atom abstraction on zigzag edges.
Department of Materials, University of Oxford , Parks Road, Oxford, OX13PH, U.K.
Judy S
JS
Kim
Department of Materials, University of Oxford , Parks Road, Oxford, OX13PH, U.K.
Jamie H
JH
Warner
Department of Materials, University of Oxford , Parks Road, Oxford, OX13PH, U.K.
Alex W
AW
Robertson
Department of Materials, University of Oxford , Parks Road, Oxford, OX13PH, U.K.|Research Complex at Harwell (RCaH), Rutherford Appleton Laboratory Harwell , Didcot, Oxon, OX11 0FA, U.K.
Angus I
AI
Kirkland
Klein edge doublet; carbon dimer; graphene; monolayer; radiation damage; transmission electron microscopy