Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 7: Metal substrates: Adsorption of organic / bio molecules I

O 7.10: Talk

Monday, March 26, 2012, 12:45–13:00, A 053

Naphthalocyanine on Au(100) _ adsorption and structural formation at submonolayer coverage — •Patrick Mehring, Axel Beimborn, Tobias Lühr, and Carsten Westphal — Technische Universität Dortmund, Experimentelle Physik 1, Germany

The formation of metal-free naphthalocyanine (H2Nc) structures on Au(100) is investigated by means of room temperature scanning tunneling microscopy at submonolayer coverage. The molecules adsorb with their plane parallel to the surface and arrange in two types of ordered domain structures. A striped phase with an orientation perpendicular to the ridge of the Au(100)_hex reconstruction and a densely packed phase with an unequal distribution along the high-symmetry surface directions is found. In the densely packed domains only one configuration of H2Nc is observed. Subsequent annealing induces a phase transformation of the adlayer. The number and size of H2Nc domains arranged in the striped phase decreases and the molecular sequence within the densely packed domain structure is changed.