SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: 2D Materials VIII

CPP 54.5: Talk

Thursday, March 30, 2023, 17:30–17:45, MER 02

Vapor Adsorption on CNMs studied with Infrared Spectroscopy — •Jakob Kreie, Petr Dementyev, Neita Khayya, and Armin Gölzhäuser — Physics of Supramolecular Systems and Surfaces, Bielefeld University, Germany

Carbon nanomembranes (CNM) are made by electron induced cross-linking of aromatic self-assembled monolayers. Previous studies show that CNM enable rapid transport of water vapor. This may be related to a strong adsorption of water molecules on the CNM surface. A spectroscopic setup for infrared measurements of vapor adsorption on CNMs is designed to investigate the adsorption on the surface under realistic conditions. For this purpose, a reaction chamber in a polarization-modulation infrared reflection absorption spectroscope (PM IRAS) is connected to a vacuum system in order to be able to control the vapor environment.

First measurements are performed with a terphenyl-4-thiol carbon nanomembrane (TPT-CNM). The results show that even low vapor pressures of heavy water are sufficient to achieve strong adsorption on the surface of the TPT-CNM, which indicates a large influence of the surface effects on water transport through the membrane.