Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: P15: Polymers and Fields

CPP 50.5: Poster

Wednesday, March 18, 2015, 10:00–13:00, Poster A

A FM-SFM study of the self-assembly of organic molecules on Au(111) — •Sebastian Schneider, Kushtrim Bytyqi, Michael Marz, Carmen Pérez León, and Regina Hoffmann-Vogel — Karlsruher Institut für Technologie, Physikalisches Institut, D-76131 Karlsruhe

Molecular self-assembly at solid interfaces is governed by the delicate balance between competing molecule-substrate and molecule-molecule interactions. Therefore, the substrate temperature during deposition, post-annealing of the sample and the molecular coverage influence the self-assembly process. Noble metal surfaces are widely used as substrates because of their low chemical reactivity. We have investigated 10,10’-dibromo-9,9’-bianthryl (DBBA) on Au(111) with frequency modulation scanning force microscopy. DBBA is well-known as precursor for graphene nanoribbons [1]. Depending on the coverage, different self-assembled molecular structures are observed on the surface. For low coverage, the molecules arrange along the herringbone reconstruction of the Au(111) (HB-phase). With increasing coverage, a new phase of molecular islands appear coexisting with the HB-phase. These islands display a stripe-like structure of highly ordered molecules.
J. Cai, P. Ruffieux, R. Jaafar, M. Bieri, T. Braun, et al., Nature 466, 470,(2010)