Reduction of FeO/Pt(111) thin films by exposure to atomic hydrogen
| Autor: | Flemming Besenbacher, Lindsay R. Merte, Jan Knudsen, Manos Mavrikakis, Soeren Porsgaard, Erik Lægsgaard, Falk M. Eichhorn, Lars C. Grabow, Ronnie T. Vang, Helene Zeuthen |
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| Rok vydání: | 2010 |
| Předmět: |
Hydrogen
Photoemission spectroscopy Iron oxide Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films law.invention chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy law Materials Chemistry Density functional theory Thin film Scanning tunneling microscope Spectroscopy |
| Zdroj: | Surface Science. 604:11-20 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2009.10.008 |
| Popis: | Using scanning tunneling microscopy (STM), X-ray photoemission spectroscopy (XPS) and density functional theory (DFT) calculations we have studied the reduction of ultra-thin films of FeO(1 1 1) grown on Pt(1 1 1) after exposure to atomic hydrogen at room temperature. A number of new ordered, partly-reduced FeO x structures are identified and as a general trend we reveal that all the reduced FeO x structures incorporate 2-fold coordinated Fe atoms as opposed to the original 3-fold coordinated Fe atoms in the FeO film. We find that when all the Fe atoms are 2-fold O-coordinated the FeO x surface structure is resistant to further reduction at room temperature. We observe that water easily dissociates on the most heavily reduced FeO x , structure in contrast to the initially inert FeO film, and reveal that it is possible to partially re-oxidize the FeO x film by heating the surface slightly in the presence of water. |
| Databáze: | OpenAIRE |
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