Structural analysis of FeO(1 1 1)/Ag(0 0 1): undulation of hexagonal oxide monolayers due to square lattice metal substrates

Bruns, Daniel; Kiesel, Irena; Jentsch, Steffen; Lindemann, S. R.; Otte, Christian; Schemme, Tobias; Kuschel, Timo; Wollschläger, J.

doi:10.1088/0953-8984/26/31/315001

Cited by 16 publications

(23 citation statements)

References 58 publications

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“…The FeO stoichiometry is commonly observed for one layer thick films grown on various substrates with both hexagonal [10][11][12][13][14] and square [15][16][17][18][19] symmetry. Intriguingly, in most cases such films grow with an in-plane structure similar to (111) termination of bulk wüstite, where the surface is unstable due to the polar nature of the (111) termination of this rock-salt-like compound [20].…”

Section: Introductionmentioning

confidence: 99%

Fe Oxides on Ag Surfaces: Structure and Reactivity

et al. 2016

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One layer thick iron oxide films are attractive from both applied and fundamental science perspectives. The structural and chemical properties of these systems can be tuned by changing the substrate, making them promising materials for heterogeneous catalysis. In the present work, we investigate the structure of FeO(111) monolayer films grown on Ag(100) and Ag(111) substrates by means of microscopy and diffraction techniques and compare it with the structure of FeO(111) grown on other substrates reported in literature. We also study the NO adsorption properties of FeO(111)/Ag(100) and FeO(111)/Ag(111) systems utilizing different spectroscopic techniques. We discuss similarities and differences in the data obtained from adsorption experiments and compare it with previous results for FeO(111)/Pt(111). Keywords FeO Á Ag Á Surface X-ray diffraction Á Reactivity Á Single crystal surfaces Á Surface structure This article originally listed an author (J. F. Weaver) incorrectly. The article has been updated.

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Section: Introductionmentioning

confidence: 99%

Fe Oxides on Ag Surfaces: Structure and Reactivity

et al. 2016

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“…(100)-Oriented FeO and Fe 3 O 4 films of nanometerscale thickness have been reported by Arbreu et al, 27 Lopes et al, 28 and Bruns et al 29 by either deposition of iron in a background of O 2 or by postoxidation of a deposited iron film. A second study by Bruns et al 30 also reported the growth of an FeO(111)-like phase at submonolayer coverages which was proposed to have a monolayer structure like that of FeO on Pt. Waddill et al, 31 and Schlueter et al 32 also identified (111)-oriented FeO growing at low coverage on Ag(111) by low energy electron diffraction and X-ray diffraction, respectively.…”

Section: ■ Introductionmentioning

confidence: 94%

Growth of Ultrathin Iron Oxide Films on Ag(100)

et al. 2015

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Ultrathin iron oxide films are useful model materials for fundamental studies of surface processes and exhibit intriguing properties as catalysts, as demonstrated recently in a number of studies utilizing platinum as a substrate. We report a study of the initial stages of iron oxide film growth on an Ag(100) surface using scanning tunneling microscopy, low energy electron diffraction, X-ray photoelectron spectroscopy, and near-edge X-ray absorption fine structure spectroscopy, with the goal of elucidating the effects of the substrate material on FeO x film growth and physical properties. We demonstrate that a well-ordered, monolayer-thick FeO(111) film can be prepared which is similar to the well-studied structure formed on Pt (111), though with a significantly expanded lattice constant indicative of smaller Fe−O buckling and weaker interactions with the substrate. Increased oxygen pressure during deposition leads to formation of a multilayer phase taking the form of well-ordered islands. Although superficially similar to FeO(111), spectroscopic measurements show a substantial proportion of Fe 3+ in the phase. FeO(100) grains are observed upon deposition at elevated substrate temperatures, which is proposed to result from formation and oxidation of iron clusters embedded in the surface.

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“…Although growth of FeO(111) monolayers on metal surfaces other than platinum has been reported, these studies have been largely limited to structural characterization and redox properties, and little information about the effect of the substrate on adsorption properties is available. However, there is evidence from published studies that the substrate can influence these properties.…”

Section: Figurementioning

confidence: 99%