title: Influence of growing conditions on the reactivity of Ni supported graphene towards CO.
abstract: Free standing graphene is chemically inert but, as recently demonstrated, CO chemisorption occurs at low crystal temperature on the single layer grown by ethene dehydrogenation on Ni(111). Such layer is inhomogeneous since different phases coexist, the relative abundance of which depends on the growth conditions. Here we show by X ray photoemission and high resolution electron energy loss spectroscopies that the attained CO coverage depends strongly on the relative weight of the different phases as well as on the concentration of carbon in the Ni subsurface region. Our data show that the chemical reactivity is hampered by the carbon content in the substrate. The correlation between the amount of adsorbed CO and the weight of the different graphene phases indicates that the top-fcc configuration is the most reactive.
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: E
authors.identifier: 0000000180831012
authors.initials: E
authors.lastname: Celasco
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: G
authors.identifier: 0000000317534933
authors.initials: G
authors.lastname: Carraro
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Smerieri
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Savio
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: M
authors.identifier: 000000025019745X
authors.initials: M
authors.lastname: Rocca
authors.affiliation: Dipartimento di Fisica, Università di Genova, 16146 Genova, Italy.
authors.forename: L
authors.identifier: 0000000337186470
authors.initials: L
authors.lastname: Vattuone