Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.59: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Self-assembly of highly ordered ferrocenyl nanostructures monitored by second harmonic generation — •Robert Ossig¹, Florian Vogel¹, Jens Hoßbach², Ulrich Siemeling², and Frank Träger¹ — ¹Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology – CINSaT, Universität Kassel — ²Institut für Chemie and Center for Interdisciplinary Nanostructure Science and Technology – CINSaT, Universität Kassel

Custom-made molecules are ideal candidates to prepare stable self-assembled monolayers (SAM), which yield a wide range of applications, for example, as electronic or sensoric devices. In this contribution we present two recently synthesized ferrocene-functionalized tripod ligands with ferrocene as a reactive head group. The anchor groups of the ligands consist of three thioether-chains, each with 8 or 12 carbon atoms, respectively. Due to their structure, these molecules show a very high rigidity, which is an important pre-condition to form stable SAMs. To monitor the SAM formation, second harmonic generation (SHG) has been applied. The in situ SHG measurements show an initial fast decrease of the signal followed by a slower decrease as a function of immersion time. For a deeper insight of the involved processes, concentration dependent measurements have been performed. From these measurements we conclude that the SAM formation of both molecules occurs in a two-step process, a fast adsorption and a subsequent slow ordering. Further ex situ measurements (ellipsometry and scanning-tunneling-microscopy) confirm the formation of highly ordered monolayers.