1. Band Bending in Mg-Colored and O2-Activated Ultrathin MgO(001) Films
- Author
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Gabriel Delhaye, Philipp Aebi, Bruno Lépine, Sylvain Tricot, Thomas Jaouen, Guy Jézéquel, B. Hildebrand, Philippe Schieffer, Centre des Nanomatériaux de Fribourg, Université de Fribourg, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Fonds National Suisse pour la Recherche Scientifique through Division II, Fribourg Center for Nanomaterials (FriMat), Université de Fribourg = University of Fribourg (UNIFR), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Analytical chemistry ,Electronic band ,Oxide ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,medicine.disease_cause ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Auger ,Catalysis ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,chemistry.chemical_compound ,General Energy ,Band bending ,chemistry ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,medicine ,Physical and Theoretical Chemistry ,0210 nano-technology ,Ultraviolet - Abstract
International audience; Ultrathin MgO films grown on Ag(001) have been investigated using X-ray and ultraviolet photoemission spectroscopies for oxide films successively exposed to Mg and O-2 flux. Studying work functions and layer-resolved Auger shifts allows us to keep track of band profiles from the oxide surface to the interface and reveal the charge-transfer mechanisms underlying the controlled creation of Mg-induced surface color centers and the catalytic enhancement of O-2 activation. Our results demonstrate that one can intimately probe the catalytic properties of metal-supported ultrathin oxide films by studying the electronic band alignment at interfaces.
- Published
- 2017
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