Regensburg 2016 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 52: Focus: Two Dimensional Functional Materials I
CPP 52.7: Talk
Thursday, March 10, 2016, 11:45–12:00, H51
Gas permeation through carbon nanomembranes — •Vahe Chinaryan1, Sergey Shishatskiy2, Jan Wind2, Xianghui Zhang1, Henning Vieker3, Polina Angelova3, Volker Abetz Abetz2, André Beyer1, and Armin Gölzhäuser1 — 1Physics of Supramolecular Systems, University of Bielefeld, 33615 Bielefeld, Germany — 2Institute of Polymer Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany — 3CNM Technologies GmbH, 33609 Bielefeld, Germany
The gas permeation characteristics of carbon nanomembranes (CNMs) from self-assembled monolayers are reported. CNMs are 1 nm thick sheets, made by the cross-linking of molecular monolayers. CNMs were placed onto polydimethylsiloxane (PDMS) membranes to determine the gas permeation characteristics for single- and multi-layers of CNMs. CNMs made from different molecules having thicknesses from 0.6 nm up to 1.2 nm were investigated with regard to the permeation of different gases (He, H2, CO2, O2, N2,...). The CNM-PDMS composites were also characterized by X-ray photoelectron spectroscopy and helium-ion microscopy. The permeation characteristic of CNMs indicates a molecular-sieve-like transport mechanism which can be attributed to molecular-sized channels in CNMs. Additionally, the permeance of CNMs is adjustable by varying the length of the precursor molecules, i.e. the thickness of single-layer CNMs. Multilayers of CNMs show a permeation that differs significantly from single-layer CNMs, possibly due to the diffusion of the permeating molecules in between the CNM layers.