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).
Highlights
Ultra-thin metal oxides grown on various substrates have recently attracted increased scientific and technological interest
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
Using scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) we have shown that one monolayer of FeO grows on both Ag(100) and Ag(111) substrates with [111] crystallographic direction normal to the surface
Summary
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 [1,2,3,4,5]. The intrinsic availability of oxygen atoms in the material plays a significant role in e.g., oxidation reactions [6,7,8]. Ultra-thin iron oxides, in particular, have been shown to be catalytically active in e.g., reactions of selective oxidation and dehydrogenation [9]
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