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Updated: Feb 8, 2026
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Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
Published on: April 2, 2018
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Single-layer graphene membranes by crack-free transfer for gas mixture separation
Shiqi Huang1, Mostapha Dakhchoune1, Wen Luo2
1Laboratory of Advanced Separations (LAS), École Polytechnique Fédérale de Lausanne (EPFL), Sion, 1950, Switzerland.
Nature Communications
|July 8, 2018
Summary
Researchers developed a new method for creating large-area, crack-free graphene membranes with molecular-sized pores. This breakthrough advances nanoporous graphene membranes for gas separation applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Single-layer graphene is a promising material for advanced membranes.
- Key challenges include large-area, crack-free transfer and creating molecular-sized nanopores.
Purpose of the Study:
- To develop a scalable technique for fabricating high-performance nanoporous graphene membranes.
- To overcome limitations in graphene transfer and nanopore creation.
Main Methods:
- A nanoporous-carbon-assisted transfer technique for crack-free, large-area graphene films.
- Utilizing intrinsic defects in chemical-vapor deposited graphene for gas-sieving.
- Ozone functionalization for etching and pore modification to enhance selectivity and permeance.
Main Results:
- Achieved large-area (1 mm²) crack-free suspended graphene films.
- Observed H₂/CH₄ selectivity up to 25 from intrinsic defects.
- Demonstrated significant improvements in H₂ permeance (up to 300%) and H₂/CH₄ selectivity (up to 150%) after pore modification.
Conclusions:
- The developed scalable transfer, etching, and functionalization methods are crucial for advancing nanoporous graphene membranes.
- This work brings practical applications of nanoporous graphene membranes closer to reality.
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