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Ion Selectivity in Multilayered Stacked Nanoporous Graphene.

Niketa A K1, Shishir Kumar1

  • 1Department of Electrical Engineering, Indian Institute of Technology Hyderabad, Hyderabad 502284, Telangana, India.

ACS Applied Materials & Interfaces
|January 18, 2024
PubMed
Summary

Two-layer nanoporous graphene membranes offer optimal defect control and high selectivity for molecular filtration. Adding more layers decreases ionic selectivity, guiding the design of advanced filtration systems.

Keywords:
2D materialsarea-normalized conductancegraphenemembranenanoporesoxygen plasmaselectivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Nanoporous graphene shows promise for high-performance molecular filtration due to its unique properties.
  • Defects in graphene growth and transfer hinder its application in filtration, necessitating controlled pore creation.
  • Layer stacking and plasma treatment offer methods to create controlled nanopores in graphene.

Purpose of the Study:

  • To investigate the effect of graphene layer stacking on ionic transport and selectivity for filtration.
  • To determine the optimal number of graphene layers for achieving a balance between defect coverage and selectivity.
  • To develop a model explaining the observed changes in ionic selectivity with increasing graphene layers.

Main Methods:

  • Fabrication of multi-layered graphene stacks (up to three layers).
  • Controlled nanopore initiation using oxygen plasma treatment.
  • Electrical characterization of ionic solutions using a standard diffusion cell to measure ionic transport and selectivity.

Main Results:

  • Two-layer graphene stacks demonstrated the best balance of defect coverage and high ionic selectivity.
  • Increasing the number of graphene layers beyond two led to a decrease in ionic selectivity.
  • A model was developed to explain the observed reduction in selectivity with additional graphene layers.

Conclusions:

  • Two-layer nanoporous graphene is optimal for high-performance filtration applications.
  • Understanding the impact of layer stacking is crucial for designing advanced two-dimensional material-based filtration systems.
  • This research provides valuable insights for the practical implementation of graphene in molecular filtration technologies.