Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces: 1D and 2D structures and networks II
O 69.5: Talk
Wednesday, March 14, 2018, 16:00–16:15, MA 141
Dependence of the adsorption height of graphene-like adsorbates on their dimensionality — •Serguei Soubatch1, Simon Weiss1, Xiaosheng Yang1, Arnulf Stein2, David Gerbert2, Christine Brülke3, Roman Kremring3, Sascha Feldmann2, Alex Schenk4, Marie Gille5, Timo Heepenstrick3, Ina Krieger3, Francois Bocquet1, Stefan Hecht5, Moritz Sokolowski3, Petra Tegeder2, and Stefan Tautz1 — 1Forschungszentrum Jülich, Jülich, Germany — 2Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany — 3Universität Bonn, Bonn, Germany — 4La Trobe University, La Trobe, Australia — 5Humboldt-Universität zu Berlin, Berlin, Germany
We measured the adsorption height of various graphene nanoribbons on the Cu(111) and the Au(111) surfaces and hexagonal boron nitride (hBN) and graphene on the Cu(111) surface using the x-ray standing waves technique. On Au(111), the different types of nanoribbons studied in our work are found to be physisorbed, while on Cu(111) the adsorption height is noticeably reduced pointing at a significant contribution of chemical interactions. Comparing to π-conjugated molecules on the one hand and hBN and graphene on the other, we observe a strong dependence of the adsorption height on the dimensionality of the adsorbate. This shows that graphene-like carbon adsorbates interact with the metal substrate mainly via the electron density of the honeycomb lattice. Chemical interactions involving edge atoms play a minor role.