Role of Precursor Carbides for Graphene Growth on Ni(111).

ABSTRACT: Surface X-ray Diffraction was used to study the transformation of a carbon-supersaturated carbidic precursor toward a complete single layer of graphene in the temperature region below 703 K without carbon supply from the gas phase. The excess carbon beyond the 0.45  monolayers of C atoms within a single Ni₂C layer is accompanied by sharpened reflections of the |4772| superstructure, along with ring-like diffraction features resulting from non-coincidence rotated Ni₂C-type domains. A dynamic Ni₂C reordering process, accompanied by slow carbon loss to subsurface regions, is proposed to increase the Ni₂C 2D carbide long-range order via ripening toward coherent domains, and to increase the local supersaturation of near-surface dissolved carbon requir

SUBMITTER: Rameshan R 

PROVIDER: S-EPMC5805774 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature