title: Temperature-driven changes of the graphene edge structure on Ni(111): substrate vs hydrogen passivation.
abstract: Atomic-scale description of the structure of graphene edges on Ni(111), both during and post growth, is obtained by scanning tunneling microscopy (STM) in combination with density functional theory (DFT). During growth, at 470 °C, fast STM images (250 ms/image) evidence graphene flakes anchored to the substrate, with the edges exhibiting zigzag or Klein structure depending on the orientation. If growth is frozen, the flake edges hydrogenate and detach from the substrate, with hydrogen reconstructing the Klein edges.
authors.affiliation: Department of Physics and #Center of Excellence for Nanostructured Materials (CENMAT), Università degli Studi di Trieste , via Alfonso Valerio 2, 34127 Trieste, Italy.
authors.forename: Laerte L
authors.initials: LL
authors.lastname: Patera
authors.forename: Federico
authors.initials: F
authors.lastname: Bianchini
authors.forename: Giulia
authors.initials: G
authors.lastname: Troiano
authors.forename: Carlo
authors.initials: C
authors.lastname: Dri
authors.forename: Cinzia
authors.initials: C
authors.lastname: Cepek
authors.forename: Maria
authors.initials: M
authors.lastname: Peressi
authors.forename: Cristina
authors.initials: C
authors.lastname: Africh
authors.forename: Giovanni
authors.initials: G
authors.lastname: Comelli
keywords: DFT; Graphene; STM; edge; hydrogen; nickel