Two-dimensional (2-D) transition metal oxide layers have attracted significant interest during the past decade due to their novel emergent properties and their high potential for nanotechnology applications . For practical reasons 2-D oxide layers are usually supported on metal surfaces. This leads to a coupling of the oxide overlayer to the metal substrate, often strong coupling, which creates a metal-oxide hybrid system with properties that are largely determined by the oxide-metal interface. In this talk, I will discuss the role of the metal-oxide coupling in shaping the morphology and structure of two-dimensional oxide systems. Moreover, the effects of interfacial strain on the physical and chemical properties of 2-D oxide layers will be investigated. I will discuss 3 case studies:
1) W-oxide on Pd(100) , a system with strong oxide-metal coupling, leading to a commensurate overlayer with strong strain effects;
2) W-oxide on Ag(100), a system with weak oxide-metal coupling, leading to an incommensurate overlayer with virtually no strain;
3) Ce-oxide on Cu(110) , where the symmetry mismatch at the interface generates a spatially modulated strain field giving rise to a periodic pattern formation.
All 2-D oxide overlayers are prepared by a PVD method and are atomically characterized experimentally in a surface science approach by STM, LEED and various electron spectrocopies, as well as theoretically by extensive DFT calculations.
 Oxide materials at the two-dimensional limit. F.P. Netzer and A. Fortunelli, Eds. (Springer Series in Materials Science, Vol. 234, Springer 2016)
 N. Doudin, D. Kuhness, M. Blatnik, G. Barcaro, F.R. Negreiros, L. Sementa, A. Fortunelli, S. Surnev, F.P. Netzer, J. Phys. Chem.C 2016, 120, 28682
 L. Ma, N. Doudin, S. Surnev, G. Barcaro, L. Sementa, V. Mankad, A. Fortunelli, F.P. Netzer, J. Phys. Chem. Lett. 7(2016)1303