Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001)
Iron oxide films epitaxially grown on close-packed metal single crystal substrates exhibit nearly-perfect structural order, high catalytic activity (FeO) and room-temperature magnetism (Fe3O4). However, the morphology of the films, especially in the ultrathin regime, can be significantly influenced...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-09-01
|
| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2079-4991/8/9/719 |
| _version_ | 1818573297012441088 |
|---|---|
| author | Natalia Michalak Zygmunt Miłosz Gina Peschel Mauricio Prieto Feng Xiong Paweł Wojciechowski Thomas Schmidt Mikołaj Lewandowski |
| author_facet | Natalia Michalak Zygmunt Miłosz Gina Peschel Mauricio Prieto Feng Xiong Paweł Wojciechowski Thomas Schmidt Mikołaj Lewandowski |
| author_sort | Natalia Michalak |
| collection | DOAJ |
| description | Iron oxide films epitaxially grown on close-packed metal single crystal substrates exhibit nearly-perfect structural order, high catalytic activity (FeO) and room-temperature magnetism (Fe3O4). However, the morphology of the films, especially in the ultrathin regime, can be significantly influenced by the crystalline structure of the used support. This work reports an ultra-high vacuum (UHV) low energy electron/synchrotron light-based X-ray photoemission electron microscopy (LEEM/XPEEM) and electron diffraction (µLEED) study of the growth of FeO and Fe3O4 on two closed-packed metal single crystal surfaces: Pt(111) and Ru(0001). The results reveal the influence of the mutual orientation of adjacent substrate terraces on the morphology of iron oxide films epitaxially grown on top of them. On fcc Pt(111), which has the same mutual orientation of adjacent monoatomic terraces, FeO(111) grows with the same in-plane orientation on all substrate terraces. For Fe3O4(111), one or two orientations are observed depending on the growth conditions. On hcp Ru(0001), the adjacent terraces of which are ‘rotated’ by 180° with respect to each other, the in-plane orientation of initial FeO(111) and Fe3O4(111) crystallites is determined by the orientation of the substrate terrace on which they nucleated. The adaptation of three-fold symmetric iron oxides to three-fold symmetric substrate terraces leads to natural structuring of iron oxide films, i.e., the formation of patch-like magnetite layers on Pt(111) and stripe-like FeO and Fe3O4 structures on Ru(0001). |
| first_indexed | 2024-12-15T00:09:17Z |
| format | Article |
| id | doaj.art-cc430dfde205401e924ab52514c0dd52 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-15T00:09:17Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-cc430dfde205401e924ab52514c0dd522022-12-21T22:42:38ZengMDPI AGNanomaterials2079-49912018-09-018971910.3390/nano8090719nano8090719Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001)Natalia Michalak0Zygmunt Miłosz1Gina Peschel2Mauricio Prieto3Feng Xiong4Paweł Wojciechowski5Thomas Schmidt6Mikołaj Lewandowski7Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, PolandNanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, PolandFritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyFritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyFritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, PolandFritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, PolandIron oxide films epitaxially grown on close-packed metal single crystal substrates exhibit nearly-perfect structural order, high catalytic activity (FeO) and room-temperature magnetism (Fe3O4). However, the morphology of the films, especially in the ultrathin regime, can be significantly influenced by the crystalline structure of the used support. This work reports an ultra-high vacuum (UHV) low energy electron/synchrotron light-based X-ray photoemission electron microscopy (LEEM/XPEEM) and electron diffraction (µLEED) study of the growth of FeO and Fe3O4 on two closed-packed metal single crystal surfaces: Pt(111) and Ru(0001). The results reveal the influence of the mutual orientation of adjacent substrate terraces on the morphology of iron oxide films epitaxially grown on top of them. On fcc Pt(111), which has the same mutual orientation of adjacent monoatomic terraces, FeO(111) grows with the same in-plane orientation on all substrate terraces. For Fe3O4(111), one or two orientations are observed depending on the growth conditions. On hcp Ru(0001), the adjacent terraces of which are ‘rotated’ by 180° with respect to each other, the in-plane orientation of initial FeO(111) and Fe3O4(111) crystallites is determined by the orientation of the substrate terrace on which they nucleated. The adaptation of three-fold symmetric iron oxides to three-fold symmetric substrate terraces leads to natural structuring of iron oxide films, i.e., the formation of patch-like magnetite layers on Pt(111) and stripe-like FeO and Fe3O4 structures on Ru(0001).http://www.mdpi.com/2079-4991/8/9/719iron oxidesFeOFe3O4ultrathin filmsepitaxial growthplatinumrutheniumsymmetryLEEMLEEDXPEEM |
| spellingShingle | Natalia Michalak Zygmunt Miłosz Gina Peschel Mauricio Prieto Feng Xiong Paweł Wojciechowski Thomas Schmidt Mikołaj Lewandowski Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) Nanomaterials iron oxides FeO Fe3O4 ultrathin films epitaxial growth platinum ruthenium symmetry LEEM LEED XPEEM |
| title | Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) |
| title_full | Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) |
| title_fullStr | Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) |
| title_full_unstemmed | Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) |
| title_short | Symmetry-Induced Structuring of Ultrathin FeO and Fe3O4 Films on Pt(111) and Ru(0001) |
| title_sort | symmetry induced structuring of ultrathin feo and fe3o4 films on pt 111 and ru 0001 |
| topic | iron oxides FeO Fe3O4 ultrathin films epitaxial growth platinum ruthenium symmetry LEEM LEED XPEEM |
| url | http://www.mdpi.com/2079-4991/8/9/719 |
| work_keys_str_mv | AT nataliamichalak symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT zygmuntmiłosz symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT ginapeschel symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT mauricioprieto symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT fengxiong symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT pawełwojciechowski symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT thomasschmidt symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 AT mikołajlewandowski symmetryinducedstructuringofultrathinfeoandfe3o4filmsonpt111andru0001 |