Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)

O 18.29: Poster

Monday, February 25, 2008, 18:30–19:30, Poster F

Scanning tunnelling microscopy study of nitrobiphenylthiol self-assembled monolayers on Au(111) — •Heiko Muzik, Andrey Turchanin, and Armin Gölzhäuser — Department of Physics, Physics of Supramolecular Systems, University of Bielefeld, D-33615 Bielefeld

Electron beam/extreme UV patterning of 4*-nitro-1,1*-biphenyl-4-thiol self-assembled monolayers (NBPT SAM) on gold surfaces results in the transformation of the terminal nitro groups into amino groups and in the crosslinking of the underlying aromatic cores [1,2]. Such chemical nanolithography has a great potential for nanobiotechnological applications (e.g. fabrication of protein chips[3]), where the postprocessing of amino-terminated and pristine areas results in the formation of complex supramolecular assemblies with lateral dimensions of periodic structures down to 30 nm. The understanding of the formation of NBPT SAM at the molecular level is important for a further implementation of chemical nanolithography in different areas. In this contribution we show the first results of a UHV scanning tunneling microscopy (STM) study of NBPT SAMs on Au(111). We present a detailed data evaluation procedure for a non-orthogonal Multiscan-type scanner (Omicron Nanotechnology). The structural polymorphism of NBPT SAMs will be discussed subjecting to the preparation conditions of the samples and their subsequent temperature treatment in UHV. [1] W. Eck et al., Adv. Mater. 2000, 12, 805 [2] A. Turchanin et al., Small 2007. [3] A. Turchanin et al., Adv. Mater. 2007.