Controlling the physics and chemistry of binary and ternary praseodymium and cerium oxide systems

Autor(en): Niu, Gang
Zoellner, Marvin Hartwig
Schroeder, Thomas
Schaefer, Andreas
Jhang, Jin-Hao
Zielasek, Volkmar
Baeumer, Marcus
Wilkens, Henrik 
Wollschlaeger, Joachim 
Olbrich, Reinhard
Lammers, Christian
Reichling, Michael 
Stichwörter: CEO2(111) THIN-FILMS; Chemistry; Chemistry, Physical; DEFECT STRUCTURE; DENSITY-FUNCTIONAL THEORY; ELECTRONIC STATES; EPITAXIAL-GROWTH; O-VACANCIES; OXYGEN VACANCIES; Physics; Physics, Atomic, Molecular & Chemical; RAY PHOTOELECTRON-SPECTROSCOPY; SESQUIOXIDE FILMS; STRUCTURE SENSITIVITY
Erscheinungsdatum: 2015
Herausgeber: ROYAL SOC CHEMISTRY
Journal: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volumen: 17
Ausgabe: 38
Startseite: 24513
Seitenende: 24540
Zusammenfassung: 
Rare earth praseodymium and cerium oxides have attracted intense research interest in the last few decades, due to their intriguing chemical and physical characteristics. An understanding of the correlation between structure and properties, in particular the surface chemistry, is urgently required for their application in microelectronics, catalysis, optics and other fields. Such an understanding is, however, hampered by the complexity of rare earth oxide materials and experimental methods for their characterisation. Here, we report recent progress in studying high-quality, single crystalline, praseodymium and cerium oxide films as well as ternary alloys grown on Si(111) substrates. Using these well-defined systems and based on a systematic multitechnique surface science approach, the corresponding physical and chemical properties, such as the surface structure, the surface morphology, the bulk-surface interaction and the oxygen storage/release capability, are explored in detail. We show that specifically the crystalline structure and the oxygen stoichiometry of the oxide thin films can be well controlled by the film preparation method. This work leads to a comprehensive understanding of the properties of rare earth oxides and highlights the applications of these versatile materials. Furthermore, methanol adsorption studies are performed on binary and ternary rare earth oxide thin films, demonstrating the feasibility of employing such systems for model catalytic studies. Specifically for ceria systems, we find considerable stability against normal environmental conditions so that they can be considered as a ``materials bridge'' between surface science models and real catalysts.
ISSN: 14639076
DOI: 10.1039/c5cp02283e

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