Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Organic Molecules on Inorganic Substrates II: Mainly Porphyrins

O 15.1: Invited Talk

Monday, March 16, 2020, 15:00–15:30, REC C 213

Molecular nanostructures on metals vs. graphene: towards preserving functional properties — •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, thin insulating layers of either NaCl or hBN have been shown to be very useful to this end. The chemical inertness and the low density of states near the Fermi level also make graphene a good choice as a buffer layer to decouple adsorbed molecules from the underlying (metallic) substrate. For two different organic molecules, the changes in both structural and electronic properties will be discussed [1]. On the other hand, instead of turning off the molecule substrate interactions, enhancing the intermolecular interactions is another possibility for preserving the adsorbates' properties. This could be shown on the basis of charge-transfer interactions [2] as well as utilizing molecular coverage [3].

[1] J. Li et al., J. Phys. Chem. C 120 (2016) 18093 ; N. Schmidt et al., Chem. Eur. J. 25 (2019) 5065 ; J. Li et al., J. Phys. Chem. C 123 (2019) 12730. [2] K. Müller et al., Small 15 (2019) 190174. [3] B.D. Baker et al., J. Phys. Chem. C 123 (2019) 19681.