Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 24: Nanostrukturen II

O 24.3: Talk

Tuesday, March 9, 2004, 16:15–16:30, H38

Imaging of self-assembled organic adsorbates, STM-measurements under UHV conditions — •Christian Gerl, Lorenz Kampschulte, Stefan Griessl, and Wolfgang M. Heckl — LMU Muenchen, Dept. Geo.- u. Umweltwissenschaften, Theresienstr. 41, 80333 Muenchen

The adsorption of Trimesic acid (TMA) on single crystal surfaces has been studied under Ultra High Vacuum conditions. For this purpose Trimesic acid was evaporated on different substrates using an effusion cell. For the UHV preparation of TMA monolayers additional TDS (Thermal Desorption Spectroscopy) and LEED (Low Energy Electron Diffraction) investigations were necessary. The structure is characterized by periodic non-dense-packing of the molecules. Two coexisting phases could be imaged by STM with sub-molecular resolution. Induced by directed hydrogen bonding, in both cases the organic molecules built a two-dimensional grid architecture with molecular caves, both able to store guest molecules. As a first step TMA molecules themselves were inserted as guest molecules into the host structure. The guest molecules could be identified in different adsorption sites.