SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 36: Poster: 2D Materials II
O 36.3: Poster
Tuesday, March 28, 2023, 18:00–20:00, P2/EG
Carbon Nanomembranes Fabricated from Amorphous Molecular Layers — •Zhen Yao1, Nikolaus Meyerbröker2, Yubo Qi1, Michael Westphal1, Yang Yang1, and Armin Gölzhäuser1 — 1Bielefeld University, Bielefeld, Germany — 2CNM Technologies, Bielefeld, Germany
Ultrathin carbon nanomembranes (CNMs), fabricated from crosslinking self-assemblies of molecular precursors, are 2D membranes that possess well-defined physical and chemical properties. With a simple transfer procedure, CNMs can be placed on various supports, enabling versatile applications. Combining high water flux and precise ion selectivity, CNMs are ideal materials for molecular separation and water desalination. However, their practical realization is hindered by the availability of epitaxial metal substrates. Here, we report a new type of CNM fabricated from poly(4-vinylbiphenyl) (PVBP) spin-coated on SiO2/Si substrate. The electron-induced crosslinking results in the formation of a continuous membrane with a thickness of 15 nm. The nanoporous nature of the PBVP-CNM is revealed by water and ion permeation measurements. The membrane possesses a high density of pores, which allows water flux as high as 530 L m-2 h-1 bar-1. It also exhibits the rejection of ions and molecules with sizes >1 nm. A further introduction of a reinforcement porous block copolymer layer simplifies the transfer procedure, resulting in a centimetre-scale CNM-composite that works efficiently for dye rejection. These results suggest a feasible route for large-scale nanoporous membrane fabrication.