Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 10: Metal substrates: Adsorption of organic / bio molecules II
O 10.3: Vortrag
Montag, 14. März 2011, 15:30–15:45, TRE Phy
2D-self-assembly of chiral buckybowls — •Quirin Stoeckl1, Tobias Bauert1, Davide Bandera2, Manfred Parschau1, Jay S. Siegel2, and Karl-Heinz Ernst1 — 1Empa, Nanoscale Material Science, Dübendorf, Switzerland — 2Organisch-chemisches Institut, Universität Zürich, Switzerland
So-called buckybowls, quasi-fragments of buckminsterfullerene, are promising candidates for suface modifications for organic photovoltaics and controlled carbon nanotube growth. Corannulene (COR, C20H10) is the simplest curved fragment with a central C5 ring, surrounded by five aromatic C6 rings. We investigated the self-assembly of the C5-symmetric pentaphenyl-corannulene (Ph5Cor), a chiral derivative with five phenyl groups at the rim, on Cu(111). Fivefold symmetry is incompatible with the translational order in all 17 2D plane groups, and this system is therefore of fundamental interest for 2D self-assembly. STM shows packing motifs in which the five substituents are interdigitated and are compatible with LEED results. Workfuntion change measurements via UPS reveal an unusual large interface dipole. We compare our findings with those obtained for other penta-substituted COR derivatives on Cu(111) and present preliminary results for thermally- induced dehydrogenation into polymeric structures.