Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.3: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

STM Study of the structural formation of crystal violet on Au(100) and Au(111) surfaces — •Patrick Mehring, Lothar Brosda, and Carsten Westphal — Fakultät Physik - Technische Universität Dortmund, Otto-Hahn-Str. 4, D 44221 Dortmund

The selective modification of metal surfaces offers a large variety of possible applications in different fields. Thus, the understanding of the adsorption and structural formation of molecules with well-known properties attracted large attention for different applications in the last years. Crucial parameters having strong influence on the assembly mechanism are the molecular coverage, temperature, and substrate interaction which are topics of many studies. The adsorption and structural formation of crystal violet on Au(100) and Au(111) was investigated by means of scanning tunneling microscopy for different coverages ranging from submonolayer to multilayer regime. The molecules are found forming ordered structures near a closed monolayer on both surfaces. Thus, the phases show similar structural features on both substrate orientations. Overall, two different molecule orientations can be identified. A structure model is presented for both Au(100) and Au(111) surfaces. When reaching the multilayer regime the long range order decreases and only isolated areas with alternating molecule orientation are found.