Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

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

O 51.9: Poster

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

Continuously changing incommensurate adlayer: Coronene on Graphene — •Falko Sojka, Matthias Meissner, Tobias Huempfner, Lars Matthes, Roman Forker, and Torsten Fritz — Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany

It has been reported previously that coronene (C24H12) grows on graphite in a commensurate manner [1]. However, by means of distortion-corrected low-energy electron diffraction (LEED) measurements we find that this is the case only under very special conditions. Rather, C24H12 grows preferably incommensurate on graphene as well as on graphite. Upon variation of temperature or coverage this well-defined structure changes continuously. On the basis of our experimental results we show how the lattice constant and the rotation angle of the layer are related. We further show that this type of incommensurate epitaxy is also accompanied by energy gain. Theoretical calculations are performed based on force-field calculations scaled by density functional theory (DFT) results as introduced recently [2]. The main claim here is to assume a flexible adlayer lattice instead of a rigid one. [1] M. Lackinger et al., Anal. Bioanal. Chem. 374 (2002) 685. [2] M. Meissner et al., ACS Nano 10 (2016) 6474-6483.