Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Oxide and Insulator Surfaces II

O 58.10: Vortrag

Mittwoch, 2. April 2014, 18:15–18:30, PHY C 213

Thin iron oxides films as support for metal nano-particles: a LEEM/PEEM study — Francesca Genuzio, Alessandro Sala, •Thomas Schmidt, and Hans-Joachim Freund — Fritz Haber Institute of the Max Planck Society, Berlin, Germany

The wide interest in characterizing Fe₃O₄ and α-Fe₂O₃, the two most common and stable iron oxide phases, arises from the variety of their technological applications, ranging from magnetic devices to heterogeneous catalysis. Their crystal structure, stoichiometry as well as their surface properties can be tuned by special preparation procedures. Moreover, in thin film systems the interaction with the substrate can strongly influence the chemical and electric properties. As model systems for catalysis, these two oxides are successfully used as supports for noble metal nano-particles. In some particular cases, the strong interaction between the nano-particle and the support (SMSI) can induce their encapsulation, affecting the activity of the system, as observed for Pt nano-particles supported on a Fe₃O₄ film[1]. Here, we report on growth and stability of Fe₃O₄ and α-Fe₂O₃ thin films on a Pt(111) substrate, as well as their interaction with Pt nano-particles. The combined LEEM/LEED and XPEEM investigations were carried out with the SMART, the aberration-corrected and energy-filtered LEEM/PEEM installed at BESSY II in Berlin. [1] Z.-H. Qin, M. Lewandowski, Y.-N. Sun, S. Shaikhutdinov, and H.-J. Freund, J. Phys. Chem. C 112, (2008), 10209-10213