Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 10: Adsorption an Oberfl
ächen I

O 10.5: Vortrag

Freitag, 4. März 2005, 16:45–17:00, TU EB301

Mediated Co-Adsorption of Hydrogen-Bound Molecular Monolayers — •Lorenz Kampschulte, Markus Lackinger, Stefan Griessl, and Wolfgang M. Heckl — Department for Earth- and Environmental Sciences, Ludwig-Maximilians-University Munich, Theresienstr. 41, D-80333 Munich, www.nano-science.de

Self-assembled monolayers (SAMs) are an important grounding for future applications of long range ordered molecular structures in nanotechnology. Hence it is of general interest to understand the parameters determining the growth and stability of these systems.

By means of Scanning Tunneling Microscopy (STM) based experiments we try to learn more about driving forces for molecular self-assembly and the influence of external parameters. Stable adsorption of TPT (1,3,5-tris(4-pyridyl)-2,4,6-triazin) molecules at the liquid-solid interface (which normally do not adsorb in an equilibrium situation) was observed by STM. Adsorption of TPT was made possible with the aid of H-bonding No-dqglue-moleculesNo-dq like TMA (1,3,5-benzene-tricarboxylic acid - trimesic acid) or TPA (1,4-benzene-dicarboxylic acid -terephthalic acid). With this method it was possible to prepare SAMs of TPT co-adsorbed with either TMA or TPA which were stable during the observation time of approximately 30 min. For continuative investigations the same molecular systems were prepared under Ultra-High-Vacuum (UHV) conditions.