(426c) Scalable Synthesis of Nanoporous Atomically Thin Graphene Membranes for Dialysis and Molecular Separations Via Facile Iso-Propanol-Assisted Hot Lamination

Scalable graphene synthesis and facile large-area membrane fabrication are imperative to advancenanoporous atomically thin membranes (NATMs) for molecular separations. Although chemical vapordeposition (CVD) allows for roll-to-roll high-quality monolayer graphene synthesis, facile transfer withatomically clean interfaces to porous supports for large-area NATM fabrication remains extremely challenging.Sacrificial polymer scaffolds commonly used for graphene transfer typically leave polymer residues detrimentalto membrane performance and transfers without polymer scaffolds suffer from low yield resulting in high non-selective leakage through NATMs. Here, we systematically study the factors influencing graphene NATMfabrication and report on a novel roll-to-roll manufacturing compatible isopropanol-assisted hot lamination (IHL)process that enables scalable, facile and clean transfer of CVD graphene on to polycarbonate track etched(PCTE) supports with coverage ≥99.2%, without compromising support integrity/porosity. We demonstrate fullyfunctional centimeter-scale graphene NATMs that show ~2-3 orders of magnitude higher permeance andbetter selectivity than commercially available state-of-the-art polymeric dialysis membranes, specifically in the0-1000 Da range. Our work highlights a scalable approach to fabricate graphene NATMs for practicalapplications and is fully compatible with roll-to-roll manufacturing processes.

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