SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 60: Solid-Liquid Interfaces I: Structure and Spectroscopy
O 60.2: Talk
Wednesday, March 29, 2023, 15:15–15:30, TRE Phy
Influence of substrate on supramolecular nanostructures at the solid-liquid interface — •Baoxin Jia1, Mihaela Enache1, Sandra Miguez-Lago2, Milan Kivala2, and Meike Stöhr1 — 1Zernike Institute for Advanced Materials, University of Groningen, Netherlands — 2Institute of Organic Chemistry, University of Heidelberg, Germany
Self-assembly of supramolecular nanostructures at the solid-liquid interface has gained increasing academic interest in past recent years. Substrates can influence molecule-substrate interactions, which plays an important role in determining supramolecular nanostructures. In this study, we used scanning tunneling microscopy (STM) to investigate the self-assembly of two carboxylic acids at the nonanoic acid-solid interface. We performed the experiments on four substrates: HOPG, MoS2, Au(111), and graphene/Cu foil. We also measured the water contact angle of these four substrates to obtain some information on the molecule-substrate interaction. The STM measurements showed that, on HOPG and graphene/Cu foil, both carboxylic acids can form porous and close-packed structures, which depends on the bias voltage polarity during STM measurements. On MoS2, both carboxylic acids did not form stable self-assembled structures. On Au(111), both carboxylic acids only formed short range-ordered structures in very diluted solutions. The results reveal that the interplay between molecule-substrate, solvent-substrate and molecule-molecule interactions is important to the formation of supramolecular nanostructures at the solid-liquid interface.