Reactions on transition metal oxide surfaces studied by high-resolution STM
Dr. Stefan Wendt
Interdisciplinary Nanoscience Center, Aarhus University
Abstract: In this seminar I will summarize surface science studies addressing selected prototypical model oxide systems. In all examples STM is the main technique, but combinations with TPD, XPS and DFT calculations were very fruitful. In the first part, I will present examples found on the rutile TiO2(110)–(1×1) surface. The identification of point defects on the terraces such as oxygen vacancies and hydroxyl groups is discussed, and examples for reactions of water and ethanol molecules with oxygen vacancies and step edges will be presented. In addition, I will address thecomplex O2–TiO2(110) interaction and the photo-reaction of ethanol on differently prepared TiO2(110) surfaces. In the second part, I will present atomically resolved STM images of sub-monolayer vanadium(V) on anataseTiO2(101). Following V deposition at liquid nitrogen temperature, the surface is covered with small isolated V clusters. However, embedding of V into the surface was found upon warming the sample to room temperature. The newly appeared features were assigned to monomeric V at regular Ti surface sites. Finally, I will address the structure of ultrathin FeO islands grown on Pt(111), with the focus on the edges of the FeO islands. Compared to my talk at the 2nd ICASS conference I will go more into detail particularly regarding the O2–TiO2(110) interaction.
Venue: Conference Room of State Key Laboratory of Catalysis
Tme: June 15, 2017 (Thursday) 9:30am