Graphene kirigami membrane with superior theoretical permeability and adjustable selection capability

Yuan Gao, Shujian Chen, Weiqiang Chen, Wei Wang, Wenhui Duan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Membrane plays a central role in molecule separation and selection. However, most artificial membranes utilise a fixed passage size and only effective for limited molecule types. Here, via a large series of molecular and first-principles calculations, we reveal the potential of graphene kirigami (GK), a novel structure with nanoscale incisions on one-atom-thick graphene, which can transform into a three-dimensional structure under deformation, as an ultra-membrane for highly adjustable molecule selection and the practical fabrication feasibility of GK-like membranes using a novel selective tearing process on initially defected graphene. Facilitated by the high stretchability of GK-based membranes, we demonstrate a wide range of gas selection capability on a single membrane. The interaction energy of adsorbed gas molecule also shows that the unique geometry of the pores on GK enables a new adsorption channelling mechanism that enhances molecular separation. Compared with nanoporous graphene, the dynamic gas penetration test shows that various GK membranes are capable of 30 times higher pore-size adjustability and up to 1.5–3.4 times higher gas separation rate. The GK ultra-membrane opens new venues for numerous applications in CO2 capture and storage, water desalination, wastewater treatment, hazardous waste containment system, chemical processing, bionics, and pharmaceutical and medical devices.

Original languageEnglish
Pages (from-to)398-407
Number of pages10
JournalCarbon
Volume181
DOIs
Publication statusPublished - 30 Aug 2021

Keywords

  • DFT
  • Gas selection
  • Graphene kirigami
  • Molecular dynamics
  • Nanofabrication
  • Ultra-membrane

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