Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 28: Heterogeneous catalysis II

O 28.6: Talk

Tuesday, March 27, 2012, 11:45–12:00, MA 042

MgO on Mo(001) — Growth Study of a Model System for Heterogeneous Catalysis — •Stefanie Stuckenholz, Christin Büchner, Leonid Lichtenstein, Markus Heyde, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck- Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

The morphology and electronic structure of oxide surfaces play an important role in surface reactions and thus in heterogeneous catalysis [1]. Insight into reactivity influencing parameters at the atomic level can be gained by incorporating scanning probe techniques.

The main tool we use is a microscope combining frequency modulation dynamic force microscopy (FM-DFM) with scanning tunneling microscopy (STM) [2]. This custom-built instrumentation provides atomically resolved complementary information about the morphology and the electronic properties of local surface sites.

Following previous studies on thin MgO films [3] we want to use our versatile microscope to characterize the change in morphology and the electronic structure of the oxide surface with respect to the transition from a thin film to a bulk-system. In this study we use MgO on Mo(001) as a model system for catalysis. We will present findings which were made during the growth study of the model system.

[1] L. Giordano, et al., Acc. Chem. Res. 44, 1244 (2011)

[2] M. Heyde, et al., Appl. Phys. Lett. 89, 263107 (2006)

[3] T. König, et al., J. Am. Chem. Soc. 131, 17544 (2009)