Multifunctional wafer-scale graphene membranes for fast ultrafiltration and high permeation gas separation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30480092.
- Also identified by DOI 10.1126/sciadv.aau0476 and PMC identifier 6251721.
- Licence recorded as CC BY-NC.
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Abstract
Reliable and large-scale manufacturing routes for perforated graphene membranes in separation and filtration remain challenging. We introduce two manufacturing pathways for the fabrication of highly porous, perforated graphene membranes with sub-100-nm pores, suitable for ultrafiltration and as a two-dimensional (2D) scaffold for synthesizing ultrathin, gas-selective polymers. The two complementary processes-bottom up and top down-enable perforated graphene membranes with desired layer number and allow ultrafiltration applications with liquid permeances up to 5.55 × 10<sup>-8</sup> m<sup>3</sup> s<sup>-1</sup> Pa<sup>-1</sup> m<sup>-2</sup>. Moreover, thin-film polymers fabricated via vapor-liquid interfacial polymerization on these perforated graphene membranes constitute gas-selective polyimide graphene membranes as thin as 20 nm with superior permeances. The methods of controlled, simple, and reliable graphene perforation on wafer scale along with vapor-liquid polymerization allow the expansion of current 2D membrane technology to high-performance ultrafiltration and 2D material reinforced, gas-selective thin-film polymers.