Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 23: Poster Monday: Nanostructures 1
O 23.3: Poster
Monday, September 5, 2022, 18:00–20:00, P4
Efficient Sieving Performance with Carbon Nanomembranes (CNMs) — •Yubo Qi, Petr Dementyev, and Armin Gölzhäuser — Bielefeld University, Bielefeld, Germany
Nanoporous membranes are promising candidates in ion transport and molecular separation; however, it is still a great challenge to achieve high permeability and selectivity. Carbon nanomembranes (CNMs) emerge as attractive materials for water purification, energy storage, and gas separation. In this work, we present facile CNMs fabrication from polycyclic aromatic hydrocarbons that are drop-cast onto arbitrary supports, including foils and metalized films. The electron-induced polymerization is shown to result in continuous sheets of various thickness, and the material is characterized by some spectroscopic and microscopic techniques. The permeation measurements with freestanding membranes reveal a high degree of porosity, and the water permeance (~10−4 mol m−2 s−1 Pa−1) is four orders of magnitude higher than helium (~10−8 mol m−2 s−1 Pa−1) with a membrane thickness of 3.0 nm. The ion transport properties were investigated via bias voltage applied across through CNMs. The nanomembrane showed the ability to sieve monovalent and divalent cations, selectivity of all cations follow the ordering K+ > Na+ > Li+ > Ca2+ > Mg2+. Functional CNMs fabricated from inexpensive precursors pave the way towards the rational design of 2D membranes for high efficient separation.