title: CO-induced embedding of Pt adatoms in a partially reduced FeO(x) film on Pt(111).
abstract: The reduction of a single-layer FeO film grown on Pt(111) by CO at elevated pressures and temperatures has been studied through an interplay of scanning tunneling microscopy, ambient-pressure X-ray photoelectron spectroscopy, and density functional theory calculations. Exposure of the FeO thin film to CO at pressures between 1 and 30 Torr and temperatures between 500 and 530 K leads to formation of a honeycomb-structured Fe(3)O(2) film with hollow sites occupied by single Pt atoms extracted from the substrate surface. The formation of these adatoms is driven by an increase in CO adsorption energy. In addition, the structure incorporates undercoordinated Fe centers, which are proposed to have substantial effects on the catalytic properties of the surface.
authors.affiliation: Interdisciplinary Nanoscience Center (iNANO) and Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Lindsay R
authors.initials: LR
authors.lastname: Merte
authors.forename: Jan
authors.initials: J
authors.lastname: Knudsen
authors.forename: Falk M
authors.initials: FM
authors.lastname: Eichhorn
authors.forename: Soeren
authors.initials: S
authors.lastname: Porsgaard
authors.forename: Helene
authors.initials: H
authors.lastname: Zeuthen
authors.forename: Lars C
authors.initials: LC
authors.lastname: Grabow
authors.forename: Erik
authors.initials: E
authors.lastname: Lægsgaard
authors.forename: Hendrik
authors.initials: H
authors.lastname: Bluhm
authors.forename: Miquel
authors.initials: M
authors.lastname: Salmeron
authors.forename: Manos
authors.initials: M
authors.lastname: Mavrikakis
authors.forename: Flemming
authors.initials: F
authors.lastname: Besenbacher