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Ionic Conductance through Graphene: Assessing Its Applicability as a Proton Selective Membrane.

Pavan Chaturvedi1, Ivan V Vlassiouk2, David A Cullen3

  • 1Department of Chemistry and Biochemistry , New Mexico State University , Las Cruces , New Mexico 88003 , United States.

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Graphene membranes show promise for proton selective applications. Defect engineering, particularly with He-ion beams and H2 plasma, enhances proton conductance and selectivity in graphene materials.

Keywords:
Ramandefectgrapheneion bombardmentionic conductivityplasmaproton selectivity

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Recent studies suggest proton transport through graphene.
  • Graphene's potential for proton-selective membranes requires further investigation.
  • Understanding ionic conductance and selectivity in graphene is crucial for its application.

Purpose of the Study:

  • To evaluate pristine and defect-engineered graphene membranes for proton selectivity.
  • To assess the feasibility of using graphene as a proton-selective membrane.
  • To correlate defect types with ionic conductance and proton selectivity.

Main Methods:

  • Investigated ionic conductance and selectivity of pristine and defect-engineered graphene.
  • Utilized chemical vapor deposited (CVD) graphene membranes.
  • Introduced defects using ion beam (He+, Ga+) irradiation and plasma (N2, H2) treatments.
  • Analyzed defect types using Raman spectroscopy.

Main Results:

  • Pristine CVD graphene exhibits an average conductance of ~4 mS/cm2 at pH1, with significant variation due to defects.
  • Graphene shows fair proton selectivity, with conductance primarily attributed to protons.
  • He-ion beam and H2 plasma treatments improved areal conductance and proton selectivity.
  • Raman analysis confirmed vacancy-free defects in He-ion beam and H2 plasma treated graphene.

Conclusions:

  • Graphene membranes demonstrate potential for proton-selective applications.
  • Defect engineering, specifically with He-ion beams and H2 plasma, can enhance proton conductance and selectivity.
  • The type of defects significantly influences the membrane's performance.