Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Organic Molecules at Surfaces 1: Substrate Effects

O 5.1: Topical Talk

Montag, 5. September 2022, 10:30–11:00, S051

Molecular nanostructures on metals vs. graphene — •Meike Stöhr — Zernike Institute for Advanced Materials, University of Groningen, Netherlands

To preserve the (functional) properties of either individual adsorbates or well-ordered molecular assemblies upon adsorption on solid surfaces, the molecule substrate interactions have to be generally relatively weak. This can be achieved by introducing a decoupling layer between (metallic) surface and molecules. Among others, graphene has been shown to be a good choice towards this end due to its low density of states around the Fermi level [1]. For two different organic molecules, the similarities and changes will be discussed when adsorbed on metals and graphene, respectively [2]. In the second part, the formation of chevron-like graphene nanoribbons (GNRs) using Ullmann-type coupling will be presented in dependence of the substrate used. [3] While for Cu(111) and Ag(110) 1D metal-coordinated polymers were obtained GNR formation was successful on Au(111). The electronic properties of the GNRs were observed to display both a length and symmetry dependence. References: [1] S. Maier et al., Beilstein J. Nanotechnol. 12 (2021) 950. [2] J. Li et al., J. Phys. Chem. C 123 (2019) 12730; J. de la Rie et al., J. Phys. Chem. C accepted. [3] T.A. Pham et al., Small 13 (2017) 1603675; R.S.K. Houtsma et al., submitted.