Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.31: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Growth of Co-Salen on NiO(001) at submonolayer coverages: A non-contact atomic force microscopy study — •Josef Grenz, Alexander Schwarz, Johannes Hattendorff, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg

Co-Salen is a planar metal-organic Schiff base complex and known for its oxygen affinity. In a previous study we investigated the adsorption of this molecule on NaCl(001) [1,2]. The observed island growth mode indicates a rather weak molecule-surface interaction. As a result the molecular ordering within the islands is the same as in bulk Co-Salen, where the building blocks are dimers, which form a monoclinic unit cell.
Interestingly, on NiO(001), which also crystallizes in the rocksalt structure, a layer-by-layer growth is observed. Such a growth mode suggests a larger molecule-substrate interaction than on NaCl(001), most likely due to the above-mentioned oxygen affinity of Co-Salen. The measured island heights at submonolayer coverages indicate also dimers as building blocks. However, the shapes of the islands are rather irregular. In this presentation the influence of the substrate temperature on the island shape as well as the molecular ordering within the island will be discussed.

[1] S. Fremy et al., Nanotechnology 20, 405608 (2009).

[2] K. Lämmle et al., Nano Lett. 10, 2965 (2010).