Scalable synthesis of nanoporous atomically thin graphene membranes for dialysis and molecular separations via facile isopropanol-assisted hot lamination
Scalable synthesis of nanoporous atomically thin graphene membranes for dialysis and molecular separations via facile isopropanol-assisted hot lamination
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DOI：
10.1039/d0nr07384a
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发表时间：
2021-02-07
期刊：
影响因子：
6.7
通讯作者：
Kidambi, Piran R.
中科院分区：
文献类型：
--
作者：
Cheng, Peifu;Moehring, Nicole K.;Kidambi, Piran R.
可扩展的石墨烯合成和简便的大面积膜制备是发展用于分子分离的纳米孔原子薄膜的必要条件。虽然化学气相沉积(CVD)可以实现卷对卷高质量单层石墨烯的合成，但通过原子清洁的界面方便地转移到多孔载体上进行大面积新奥姆制造仍然具有极大的挑战性。通常用于石墨烯转移的牺牲性聚合物支架通常会留下不利于膜性能的聚合物残留物，而没有聚合物支架的转移产率较低，导致高非选择性渗漏。在这里，我们系统地研究了影响石墨烯新奥姆制造的因素，并报道了一种新型的卷到卷制造兼容的异丙醇辅助热层压(IHL)工艺，该工艺能够实现CVD石墨烯在聚碳酸酯径迹蚀刻(PCTE)载体上的可伸缩、方便和清洁的转移，覆盖率为99.2%，同时保持载体的完整性/孔隙率。我们展示了功能齐全的厘米级石墨烯透析膜，它们表现出创纪录的高透过率(类似于高出2-3个数量级)和比商业上可用的最先进的聚合物透析膜更好的选择性，特别是在0-1000 Da范围内。我们的工作突出了一种可扩展的方法来制造用于实际应用的石墨烯NatM，并与卷到卷制造工艺完全兼容。
Scalable graphene synthesis and facile large-area membrane fabrication are imperative to advance nanoporous atomically thin membranes (NATMs) for molecular separations. Although chemical vapor deposition (CVD) allows for roll-to-roll high-quality monolayer graphene synthesis, facile transfer with atomically 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 detrimental to 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 NATM fabrication 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%, while preserving support integrity/porosity. We demonstrate fully functional centimeter-scale graphene NATMs that show record high permeances (similar to 2-3 orders of magnitude higher) and better selectivity than commercially available state-of-the-art polymeric dialysis membranes, specifically in the 0-1000 Da range. Our work highlights a scalable approach to fabricate graphene NATMs for practical applications and is fully compatible with roll-to-roll manufacturing processes.