Epitaxial NiWO4 films on Ni(110): Experimental and theoretical study of surface stability
| Autor: | Svetlozar Surnev, M. Blatnik, Roland Resel, F.P. Netzer, Mykhailo Vorokhta, Claudine Noguera, Nassar Doudin, Sascha Pomp, Jacek Goniakowski |
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| Přispěvatelé: | Surface and Interface Physics, Karl-Franzens-Universität Graz, Institute of Solid State Physics, Graz University of Technology [Graz] (TU Graz), Charles University [Prague] (CU), Oxydes en basses dimensions (INSP-E9), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
X-ray photoelectron spectroscopy
Materials science 02 engineering and technology 010402 general chemistry Epitaxy 01 natural sciences faceting law.invention Crystal chemistry.chemical_compound Tungstate law Materials Chemistry Nickel tungstate density functional theory polar surfaces Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films X-ray diffraction Faceting Crystallography chemistry Chemical physics [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] scanning tunneling microscopy Density functional theory Scanning tunneling microscope 0210 nano-technology Vicinal |
| Zdroj: | Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2017, 659, pp.20-30. ⟨10.1016/j.susc.2017.02.003⟩ Surface Science Surface Science, Elsevier, 2017, 659, pp.20-30. ⟨10.1016/j.susc.2017.02.003⟩ |
| ISSN: | 0039-6028 1879-2758 |
| DOI: | 10.1016/j.susc.2017.02.003⟩ |
| Popis: | International audience; Despite the application potential of nickel tungstate (NiWO4) in heterogeneous catalysis, humidity and gas sensing, etc, its surfaces have essentially remained unexplored. In this work, NiWO4 nanoparticles and films with the wolframite structure have been grown via a solid-state reaction of (WO3)3 clusters and a NiO(100) film on a Ni(110) crystal surface and characterized by a variety of experimental techniques, including x-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM) and x-ray diffraction (XRD), combined with ab-initio density functional theory (DFT) calculations. NiWO4 grows initially as three-dimensional (3D) crystalline nanoparticles displaying mainly two crystalline facets vicinal to the (100) surface, which merge with increasing the (WO3)3 coverage into a quasi-continuous epitaxial film. The DFT results provide an account of the energetics of NiWO4 low index surfaces and highlight the role of faceting in the stabilization of extended polar (100) terraces. These combined experimental and theoretical results show that interaction with a metal substrate and vertical confinement may stabilize oxide nano-objects with high energy facets, able to enhance their reactivity. |
| Databáze: | OpenAIRE |
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