Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 14: Adsorption on semiconductors, oxides and insulators II

O 14.3: Talk

Monday, March 26, 2012, 16:30–16:45, MA 041

Adsorption of Metalophthalocyanines on thin CoO(111) films on Ir(100) — •Tobias Schmitt, Martina Reuschl, Carsten Tröppner, Lutz Hammer, and M.Alexander Schneider — LS f. Festkörperphysik, Uni. Erlangen, Germany

Cobalt oxide is technologically relevant as a low-temperature catalyst for carbon monoxide oxidation and is often used as a substrate for other oxidic and metallic catalysts. Also of particular interest is the functionalisation of catalytic surfaces by functional organic molecules or the preparation of molecular layers for organic electronics. For these applications an understanding of the interaction of large molecules with the cobalt oxide surface is needed.

On Ir(100) thin films of cobalt oxide can be grown in a variety of structures and surface terminations[1,2] that allow a systematic study with surface science methods in UHV. We investigated the adsorption of large metallophthalocyanine molecules by low-temperature scanning tunneling microscopy. As an example we identified different adsorption geometries of iron-(II)-phthalocyanine on the CoO(111)-c(10x2)-phase on Ir(100). It appears that the most favourable adsorption geometry leads to a maximisation of the interaction of the carbon pi-system with the oxygen atoms at the surface and hence the interaction of the central metal ion of the molecule with the substrate is less important.

[1] M. Gubo, et al., Phys. Rev. B 83, 075435 (2011) [2] W. Meyer, et al., Phys. Rev. Lett. 101, 016103 (2008)