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O: Fachverband Oberflächenphysik

O 74: Nanostructures at surfaces: Other

O 74.2: Vortrag

Donnerstag, 25. März 2010, 15:15–15:30, H34

Generation of Clean Iron Structures by Electron Beam Induced Deposition and Catalytic Decomposition of Iron Pentacarbonyl on Rh(110) — •Michael Schirmer, Thomas Lukasczyk, Hans-Peter Steinrück, and Hubertus Marbach — Lehrstuhl für Physikalische Chemie II and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen

The fabrication of nanostructures with arbitrary shape and well defined chemical composition still is a major challenge. Our approach is the electron beam induced deposition (EBID) in which a focused electron beam induces the local decomposition of precursor molecules, resulting in the deposition of non-volatile fragments. Here, we present an EBID study with Fe(CO)₅, on clean and modified Rh(110) surfaces. By utilizing an ultra high vacuum (UHV) system, we achieved a very high iron purity of more than 88 %, similar to previous findings on Si(100) [1]. For Rh(110) the process strongly depends on the surface properties: On a perfect, clean Rh(110) surface iron is found on irradiated and non-irradiated surface regions, due to catalytic decomposition of the Fe(CO)₅. However, on a structurally non-perfect Rh(110) surface and on a Ti-precovered Rh(110) surface a high selectivity is found, i.e. Fe deposits are formed in irradiated regions only. The role of catalytic and autocatalytic growth of iron is discussed [2]. This work was supported by the DFG under grant MA 4246/1-1. [1] T. Lukasczyk, et al., Small 4(6) (2008) 841. [2] T. Lukasczyk, et al., Langmuir 25(19) (2009) 11930.