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Updated: Sep 16, 2025
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Gated CO2 permeation across dynamic graphene pores
Luc Bondaz1, Anshaj Ronghe2, K Ganapathy Ayappa3
1Laboratory of Advanced Separations, Ecole Polytechnique Fédérale de Lausanne, Sion, Switzerland.
Nature Communications
|July 7, 2025
Summary
Oxidation of graphene creates Å-scale pores for carbon capture. Molecular dynamics simulations reveal dynamic pore behavior enabling selective carbon dioxide (CO2) separation from other gases, enhancing membrane performance.
Area of Science:
- Materials Science
- Chemical Engineering
- Computational Chemistry
Background:
- Graphene oxide membranes with semiquinone functionalization show promise for carbon capture.
- Previous studies lacked detailed mechanistic insights into pore behavior and selectivity.
Purpose of the Study:
- To elucidate the dynamic mechanisms governing Å-scale pores in functionalized graphene for carbon capture.
- To understand the role of semiquinone functional groups in selective gas transport.
Main Methods:
- Molecular dynamics (MD) simulations to study pore dynamics and gas interactions.
- Transition-state theory (TST) calculations to validate simulation results and predict transport.
Main Results:
- Semiquinone functional groups induce dynamic pore size variations, influencing gas selectivity.
- Observed dynamic pore states allow CO2 permeation through initially impermeable pores.
- Selective gating of CO2 over O2 and N2 achieved, even in larger pores.
Conclusions:
- Porous graphene membranes exhibit significant potential for advanced carbon capture applications.
- Understanding dynamic pore behavior is crucial for optimizing graphene-based separation technologies.
- This work provides a foundation for designing next-generation graphene membranes for efficient carbon capture.
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