Regensburg 2019 – scientific programme

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O: Fachverband Oberflächenphysik

O 83: Organic Molecules on Inorganic Substrates VI: Chirality, Charge Transfer, Self-Assembly

O 83.5: Talk

Thursday, April 4, 2019, 16:15–16:30, H9

Influence of Substrates on Self-Assembled Terphenyl Monolayers Investigated by NC-AFM and FM-KPFM — •Niklas Biere¹, Sascha Koch², Patrick Stohmann², Yang Yang², Armin Gölzhäuser², and Dario Anselmetti¹ — ¹Experimental Biophysics & Applied Nanoscience, University of Bielefeld, Germany — ²Physics of Supramolecular Systems and Surfaces, University of Bielefeld, Germany

Carbon Nano Membranes (CNM) are mechanical stable and homogeneous quasi 2D systems, which are formed by electron radiation induced, cross-linked self-assembled monolayers (SAM). Contrary to graphene, the CNM structural and functional properties can be tailored by the selection of precursors for the SAM formation [1]. CNMs show the capability to act as a molecular sieve to filter e.g. water molecules from impurities with extraordinary efficiency [2]. While this result promises remarkable applications, the actual process of CNM formation as well as their structure and the mechanism for water permeation is still in the focus of our investigations. Furthermore, the choice of substrate influences the self-assembly of our precursor molecules more than previously expected, even with isoelectronic surfaces like gold and silver. In this work, we will present data acquired by noncontact AFM combined with FM-KPFM under ultra-high vacuum conditions to investigate and compare the morphology of in-situ prepared SAMs and CNMs of terphenylthiols on Au(111) and Ag(111).

[1] A. Turchanin, A. Gölzhäuser, Adv. Mater. 28 (2016) 6075-6103. [2] Y. Yang et al., ACS Nano 12 (2018) 4695-4701.