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O: Oberflächenphysik

O 33: Nanostrukturen II

O 33.6: Talk

Thursday, March 27, 2003, 16:15–16:30, FOE/ORG

Supramolecular assembly on pristine and patterned metallic substrates: trimesic acid on Cu(110) and Cu(110)-(2×1)O — •T. Classen, C. K. Kim, G. Costantini, N. Lin und K. Kern — Festkörperforschung , Heisenbergstr. 1, 70569 Stuttgart

Trimesic acid (TMA) has been deposited on Cu(110) by means of organic molecular beam epitaxy. Using variable temperature STM, we have analyzed the resulting surface structures. The TMA molecules are found to arrange in linear chains along the <110> direction, while no isolated molecules are found. The interaction of the TMA molecular chains with <110> and <100> step edges have been investigated.

One-dimensional nanotemplates with tunable periodicity were also produced by exposing the Cu(110) surface to oxygen. This results in alternating Cu and Cu-O stripes along the <100> direction. Since organic molecules preferably bind to pure metal substrates, this striped nanotemplate acts as a confining potential for the adsorption of TMA. The STM measurements confirmed that even without annealing only few TMA molecules adsorb on the Cu-O stripes while the principal adsorption takes place on the Cu phase. TMA stripes are formed along the <110> direction, as for the bare Cu(110) surface, i.e. perpendicularly to the oxygen stripes. After annealing the CuO stripes are completely free of molecules and regularly ordered TMA structures are formed between them. Experimental indications for the formation of Cu-TMA complexes are discussed.