Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 103: Oxide and Insulator Surfaces: Structure, Epitaxy and Growth II
O 103.1: Vortrag
Donnerstag, 15. März 2018, 15:45–16:00, MA 041
Germania Ultrathin Films on Different Substrates — •Adrian L. Lewandowski1, Philomena Schlexer2, Christin Büchner1, Hannah Burrall3, Kristen M. Burson3, Wolf-Dieter Schneider1, Gianfranco Pacchioni2, Markus Heyde1, and Hans-Joachim Freund1 — 1Fritz-Haber-Institut der Max-Planck-Gesselschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2Department of Materials Science, Università di Milano-Bicocca, Via R. Cozzi, 55, Milan, Italy — 3Taylor Science Center, Hamilton College, 198 College Hill Road, Clinton, NY 13323, USA
New insights into the structural configuration of amorphous networks have been obtained after imaging ultrathin silica bilayer films with scanning tunneling microscopy (STM) [1]. In order to establish a general understanding of amorphous networks more structural characterization of glass-former materials, such as germanium oxide, must be done. Germania ultrathin films were grown on Ru(0001) and Pt(111) by physical vapor deposition and subsequent annealing in oxygen. The atomically flat films were characterized by combining intensity-voltage low energy electron diffraction and ab initio density functional theory analysis with high-resolution STM imaging. The film-substrate interaction plays a decisive role in the film structure. On Ru(0001) a crystalline monolayer film with domain boundaries is obtained. At higher coverage disordered phases are revealed. On Pt(111) many different phases can be identified: monolayers with different symmetry, disordered layers at higher coverage and zigzag-line phases.
[1] L. Lichtenstein et al., Angew. Chem. Int. Ed. 51, 404 (2012)