Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: Nanostructured Surfaces and Thin Films I: Synthesis and Properties (joint session O/CPP)
O 74.4: Talk
Wednesday, March 18, 2020, 15:45–16:00, WIL B321
Determination of Carbon Nanomembrane Diffusion Coefficients via radioactive tracer experiments — Raphael Dalpke1, Anna Dreyer2, •Riko Korzetz1, André Beyer1, Karl-Josef Dietz2, and Armin Gölzhäuser1 — 1Faculty of Physics, Bielefeld University — 2Faculty of Biology, Bielefeld University
In recent years, 2D materials have gained a lot of attention as highly efficient filter materials. One class of materials are carbon nanomembranes (CNM), which are fabricated by self-assembly of organic precursors onto metal substrates and subsequent cross-linking by electron irradiation. They can be released from their original substrate and transferred onto arbitrary supports. Specifically, CNMs made from terphenylthiol (TPT) exhibit a very high selectivity towards water in combination with an outstanding permeance [1].
Here, we present new permeation measurements of TPT-CNMs utilizing radioactively marked water as well as carbonate and phosphate ions. We show that water and carbonate can pass through while phosphate ions are completely blocked by the CNM. The resulting diffusion coefficients in combination with recent findings indicate that the permeation across the membrane primarily occurs by transport of neutral species. This implies a fast transport of CO2 in aqueous solution, while dry TPT-CNMs are not permeable to CO2, which suggests a facilitated transport in the presence of water.
[1] Yang et.al., ACS Nano 2018 12(5), 4695-4701