Fe Oxides on Ag Surfaces: Structure and Reactivity
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ORIGINAL PAPER
Fe Oxides on Ag Surfaces: Structure and Reactivity M. Shipilin1 • E. Lundgren1 • J. Gustafson1 • C. Zhang1 • F. Bertram2 • C. Nicklin3 • C. J. Heard4 • H. Gro¨nbeck4 • F. Zhang5 • J. Choi5 • V. Mehar5 J. F. Weaver5 • L. R. Merte1
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Ó The Author(s) 2016. This article is published with open access at Springerlink.com
Abstract 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).
This article originally listed an author (J. F. Weaver) incorrectly. The article has been updated.
Electronic supplementary material The online version of this article (doi:10.1007/s11244-016-0714-8) contains supplementary material, which is available to authorized users. & M. Shipilin [email protected] 1
Division of Synchrotron Radiation Research, Lund University, Box 118, 221 00 Lund, Sweden
2
DESY Photon Science, Notkestr. 85, 22607 Hamburg, Germany
3
Diamond Light Source, OX11 0DE, Didcot, Oxfordshire, UK
4
Chalmers University of Technology, 412 96 Go¨teborg, Sweden
5
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
Keywords FeO Ag Surface X-ray diffraction Reactivity Single crystal surfaces Surface structure
1 Introduction Ultra-thin metal oxides grown on various substrates have recently attracted increased scientific and technological interest. Due to the oxide—substrate interaction, the structural parameters of such materials are tunable and the systems offer a possibility to study and tailor surface chemical and physical properties. These kinds of novel functional materials have a wide range of applications including heterogeneous catalysis as a prominent example [1–5]. The surface of a metal oxide thin film differs fundamentally from the surface of a pure metal catalyst owing to the presence of both acidic and basic surface sites. The intrinsic availability of oxygen atoms in the material also plays a significant role in e.g., oxidation reactions [6–8]. Ultra-thin iron oxides, in particular, have been shown to be catalytically active in e.g., reactions of selective oxidation and dehydrogenation [9]. Depending on the substrate, preparation conditions, and thickness, iron oxides can grow with different stoichiometry (most common are magnetite (Fe3O4), hematite (a-Fe2O3) and wu¨stite FeO), and with differe
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