Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Oxides and Insulator Surfaces: Adsorption
O 26.4: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
In-situ studies on the growth and functionalization of MgO/Ag(100) — •Sabrina Pechmann1, Gina Peschel2, Hagen Klemm2, Thomas Schmidt2, and Rainer Fink1 — 1Physical Chemistry, FAU Erlangen-Nuremberg, Erlangen, Germany — 2Chemical Physics, Fritz-Haber-Institute of the Max Planck Society, Berlin, Germany
Metal oxide thin films on metal supports are important for various technological applications like catalysis or the fabrication of electronic devices [1]. Surface modification and functionalization plays an important role to tune the oxide surface properties. We investigated the in-situ growth and structural properties of epitaxial MgO thin films on Ag(100) using surface-sensitive LEEM and XPEEM. MgO on Ag(100) serves as an attractive model system as the lattice mismatch between both bulk structures is only 3.1%, allowing epitaxial growth with just a small number of grain boundaries [2]. MgO is sensitive to both, electron and x-ray illumination. We could follow the structural modifications. While electrons induce a long-range ordered superstructure different from the pristine material, x-ray illumination induces the formation of square-like nanostructures. We attribute the long-range order to H2O or OH adsorption, which has been further investigated by temperature-programmed desorption (TPD). The adsorption of medium-sized organic molecules on thus modified surfaces will be compared to the non-reconstructed surfaces. This work is funded by the DFG within the funCOS research unit (FOR 1878) [1]Kramer, J. et al., Surf. Sci. 517, 87-97, 2002 [2]Valeri, S. et al., Surf. Sci. 507-510, 311-317, 2002