Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 39: Nanostructures III
O 39.11: Vortrag
Donnerstag, 30. März 2006, 17:30–17:45, PHY C213
Intermixed patterns of perylene derivatives on Ag(111) — •Meike Stöhr1, Markus Wahl1, Tomas Samuely1, Till Riehm2, Thomas A. Jung1,3, and Lutz H. Gade2 — 1Institute of Physics, University of Basel — 2Insitute of Inorganic Chemistry, University of Heidelberg — 3Laboratory for Micro- and Nanostructures, Paul-Scherrer-Institute
Self-assembled systems are in the focus of nanotechnology research because of their potential use in the bottom-up creation of functional supramolecular structures. Potential applications of such systems include several functional groups. Therefore, the intermixing of different molecular compounds will become a key issue. In our approach we made use of H-bonding to form well-ordered intermixed patterns of two different perylene derivates. These are PTCDA (3,4,9,10-perylene-tetracarboxylic-dianhydride) and DPDI (4,9- diaminoperylenequinone-3,10-diimine) [1]. In an UHV-setup consisting of different chambers for sample preparation and characterization thin films of DPDI and PTCDA were prepared by evaporation on Ag(111). The sample characterization was carried out with a homebuilt STM. For a ratio of 1:1 and a total coverage of about one monolayer, an ordered intermixed pattern was observed. We assume that each PTCDA molecule is interacting via H-bonding with four neighbouring DPDI molecules and vice versa. Furthermore, different intermixed patterns were observed depending on the ratio of the molecules and on the total coverage. [1] Gade et al., Angew. Chem. Int. Ed. 42 (2003) 2677