Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces III

O 33.3: Vortrag

Dienstag, 12. März 2013, 11:00–11:15, H45

On the interaction of ultrathin porphyrin layers with high energy electrons — •Florian Vollnhals, Patrick Wintrich, Marie-Madeleine Walz, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander- University Erlangen-Nuremberg, Egerlandstr. 3, 91058 Erlangen

The interaction of energetic electrons with matter is of general interest for many fields in science and technology. In this contribution we investigate the effect of electron irradiation on monolayer and multilayer films of porphyrin derivatives adsorbed on a Ag(111) single crystal using Scanning Tunneling Microscopy (STM) and Scanning Electron Microscopy (SEM) in ultra-high vacuum (UHV). We find that the corresponding electron induced defects first of all depend on the thickness of the organic film and secondly can be used for further development to fabricate metallic nanostructures. The observed effect is closely related to the novel Electron Beam Induced Surface Activation (EBISA) technique recently explored by our group. In EBISA, an oxide surface, e.g. SiO₂, is irradiated by a focused electron beam, resulting in the chemical activation of the area, such that successively dosed Fe(CO)₅ is decomposed and forms an iron deposit. Further autocatalytic growth results in pure (>90%at.) crystalline iron nanostructures.^[1] In this contribution we expand this concept to porphyrin layers on Ag(111) as a novel means to fabricate complex nanostructures with lithographic control. This work was supported by the DFG via grant MA 4246/1-1.

^[1] M.-M. Walz et al., Angew. Chem. Int. Ed. 49 (2010), 4669