Identification of O-rich structures on platinum(111)-supported ultrathin iron oxide films
| Autor: | Flemming Besenbacher, Manos Mavrikakis, Lindsay R. Merte, Helene Zeuthen, Yunhai Bai, Stefan Wendt, Guowen Peng, Lutz Lammich |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
TEMPERATURE CO OXIDATION Iron oxide STM chemistry.chemical_element BASIS-SET 02 engineering and technology 010402 general chemistry 01 natural sciences AUGMENTED-WAVE METHOD Catalysis OXYGEN Ion law.invention Metal chemistry.chemical_compound CATALYTIC-OXIDATION law PT(111) Materials Chemistry Density functional theory (DFT) O adatom dislocations TOTAL-ENERGY CALCULATIONS Distinct protrusions Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics Scanning tunneling microscopy (STM) FeO2 (-) (x) islands 0104 chemical sciences Surfaces Coatings and Films METAL-SUPPORT INTERACTIONS Crystallography chemistry visual_art visual_art.visual_art_medium ACTIVE-SITES Density functional theory Scanning tunneling microscope 0210 nano-technology Platinum |
| Zdroj: | Merte, L R, Bai, Y, Zeuthen, H, Peng, G, Lammich, L, Besenbacher, F, Mavrikakis, M & Wendt, S 2016, ' Identification of O-rich structures on platinum(111)-supported ultrathin iron oxide films ', Surface Science, vol. 652, pp. 261-268 . https://doi.org/10.1016/j.susc.2015.12.031 |
| DOI: | 10.1016/j.susc.2015.12.031 |
| Popis: | Using high-resolution scanning tunneling microscopy (STM) we have studied the oxidation of ultrathin FeO films grown on Pt(111). At the initial stage of the FeO film oxidation by atomic oxygen exposure, we identified three distinct types of line defects, all of which form boundaries between FeO domains of opposite orientation. Two types of line defects appearing bright (type-i) and dark (type-ii) in the STM images at typical scanning parameters are "metallic", whereas the third line defect exhibits nonmetallic behavior (type-iii). Atomic-scale structure models of these line defects are proposed, with type-i defects exhibiting 4-fold coordinated Fe atoms, type-ii exhibiting 2-fold coordinated O atoms, and type-iii exhibiting tetrahedrally-coordinated Fe atoms. In addition, FeO2 trilayer islands are formed upon oxidation, which appear at FCC-type domains of the moire structure. At high scanning bias, distinct protrusions on the trilayer islands are observed over surface O ions, which are assigned to H adatoms. The experimental data are supported by density functional theory (DFT) calculations, in which bare and hydroxylated FeO2 trilayer islands are compared. Finally, we compare the formation of O-rich features on continuous FeO films using atomic oxygen with the oxidation of Pt(111)-supported FeO islands accomplished by O-2 exposure. (C) 2016 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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