title: Interaction between silver nanowires and CO on a stepped platinum surface.
abstract: We studied the interplay between Ag decoration of a stepped Pt(355) surface and CO adsorption by in situ high-resolution x-ray photoelectron spectroscopy. Varying amounts of Ag deposited at 300 K initially lead to a row-by-row growth starting from the lower Pt step edges. Such decoration of the step sites results in a change in the CO adsorption behavior. An apparent blocking of step sites for low CO coverages is attributed to a change in the electronic structure, resulting in a C 1s binding energy of CO at step sites being equal to that for CO at terrace on-top sites in the presence of Ag. Higher CO coverages induce the formation of embedded Ag clusters within the upper terraces, thus freeing up a part of the original Pt step sites for CO adsorption, as was derived by a comparison to density functional theory calculations in the corresponding surface models.
authors.affiliation: Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Streber
authors.forename: B
authors.initials: B
authors.lastname: Tränkenschuh
authors.forename: J
authors.initials: J
authors.lastname: Schöck
authors.forename: C
authors.initials: C
authors.lastname: Papp
authors.forename: H-P
authors.initials: HP
authors.lastname: Steinrück
authors.forename: J-S
authors.initials: JS
authors.lastname: McEwen
authors.forename: P
authors.initials: P
authors.lastname: Gaspard
authors.forename: R
authors.initials: R
authors.lastname: Denecke