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Decimeter-Scale Atomically Thin Graphene Membranes for Gas-Liquid Separation.

Dandan Hou1,2, Shengping Zhang1,3,4,2, Xiaobo Chen1

  • 1Institute of microelectronics, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China.

ACS Applied Materials & Interfaces
|February 18, 2021
PubMed
Summary

Researchers developed large-scale nanoporous atomically thin membranes (NATMs) using graphene and a novel polymer substrate. These membranes offer high gas permeance and salt resistance, advancing graphene membrane technology for industrial applications.

Keywords:
CVD graphenegas−liquid separationlarge areananoporous atomically thin membranes (NATMs)nanoscale pores

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Graphene's potential for high-performance separation membranes is recognized.
  • Scalable and cost-effective synthesis of nanoporous graphene membranes remains a challenge.
  • Designing suitable porous polymer substrates is critical for membrane fabrication.

Purpose of the Study:

  • To develop a facile method for fabricating decimeter-scale nanoporous atomically thin membranes (NATMs).
  • To create a robust and permeable porous polymer substrate for graphene membranes.
  • To demonstrate the high performance of NATMs for gas separation applications.

Main Methods:

  • Direct casting of a porous polymer substrate onto graphene produced by chemical vapor deposition (CVD).
  • Vapor-induced phase-inversion process to form the flexible polymer substrate.
  • Oxygen (O2) plasma treatment to create nanopores in the membranes.

Main Results:

  • Fabrication of decimeter-scale (∼15 × 10 cm²) NATMs.
  • Development of a skin-free, spongelike polymer substrate providing mechanical support.
  • NATMs exhibited salt resistance and 3-5 times higher CO2 permeance than commercial polymeric membranes.

Conclusions:

  • The study presents a scalable and cost-effective route for producing large-area graphene-based membranes.
  • The developed polymer substrate effectively supports graphene while maintaining high permeance.
  • These findings bridge the gap between laboratory-scale research and industrial application of NATMs.