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O: Fachverband Oberflächenphysik
O 39: Poster Session III: Poster to Mini-Symposium: Free-standing functional molecular 2D materials I
O 39.4: Poster
Tuesday, March 2, 2021, 10:30–12:30, P
Gas permeation through a series of chemically inert carbon nanomembranes — •Vladislav Stroganov1, Daniel Hüger1, Monika Kruk2, Christof Neumann1, Krzysztof Kozieł3, Piotr Cyganik2, and Andrey Turchanin1 — 1Friedrich Schiller University Jena, 07743 Jena, Germany — 2Smoluchowski Institute of Physics, Jagiellonian University, 30-348 Krakow — 3Faculty of Chemistry, Jagiellonian University, 30-387 Krakow
Due to their unique physical and chemical properties, atomically or molecularly thin sheets are promising nanomaterials for future energy conversion and separation technologies. In this study, we investigate carbon nanomembranes (CNMs) synthesized by low energy electron beam irradiation cross-linking of self-assembled monolayers based on a homologue series of biphenyl substituted carboxylic acids (C6H5-C6H4-(CH2)n-COO/Ag, n=2-6). Their permeation properties for various gases (He, Ar, D2, D2O, O2) were studied by highly sensitive mass spectrometry measurements. The results demonstrate that the permeation of CNMs can be intimately tuned by structure of the molecular precursors. A difference of only one aliphatic carbon unit can significantly modify the permeation of gases with various kinetic diameters. Based on the conducted measurements, we evaluate the size and the density of nanopores in CNMs. Both quantities are otherwise hardly accessible for the studied molecular nanosheets by conventional microscopy techniques.