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O: Fachverband Oberflächenphysik

O 51: Nanostructures at Surfaces: 1D and 2D Structures and Networks

O 51.2: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1C

self-assembly of L-tryptophan on Cu(111) studied by LT-STM — qiang xue and •yongfeng wang — Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China.

The chiral nanoclusters and one-dimensional chains of L-tryptophan on Cu(111) were investigated by ultrahigh vacuum scanning tunneling microscopy at 4.4 K. Small isolated clusters and chains coexisted on Cu(111) when molecules were deposited onto the substrate at around 30 K with a coverage of 0.25 monolayer. Then almost all the molecules self-assembled into chiral hexamers after being annealed at room temperature. When increasing molecular coverage to the full layer, only chains were found on the surface. High resolution STM images revealed that chains were composed by neutral, zwitterionic and anionic molecules. Chiral hexamers were formed by anionic tryptophan molecules. The structure difference was attributed to the competition between intermolecular and molecule-substrate interactions.