Science Advances

Supplementary Materials

This PDF file includes:

  • Note S1. High-resolution TEM (HRTEM)–based characterization of graphene.
  • Note S2. Calculation of activation energy.
  • Note S3. Estimation of the percentage of the nonselective nanopores in graphene.
  • Note S4. Estimation of the defect density from Raman.
  • Note S5. Measurement of the O3 residence time.
  • Note S6. Desorption of contaminants before permeation test.
  • Fig. S1. The correlation between Ld, nd, and ID/IG.
  • Fig. S2. HRTEM image of graphene after 6-s plasma treatment.
  • Fig. S3. Gas permeation performance of 1-s plasma-treated graphene M7 after 60°C O3 treatment for 85 s.
  • Fig. S4. The rise of O3 concentration in membrane module.
  • Fig. S5. Schematic of the setup for gas permeation test.
  • Fig. S6. Gas permeation performance of 1-s plasma-treated graphene M14.
  • Table S1. Gas permeance from M1 to M13 at 150°C.
  • Table S2. Gas permeance from M1 to M13 at 100°C.
  • Table S3. Gas permeance from M1 to M13 at 30°C.
  • Table S4. Estimated percentage of large nanopores in graphene after O2 plasma exposure for different gas molecules.
  • Table S5. Gas permeance from M9 before and after O3 etching at 60°C for 85 s.
  • Table S6. Gas permeance from M7 before and after O3 etching at 60°C for 85 s.
  • Table S7. Gas permeance from M10 before and after O3 etching at 150°C for 10 s.
  • Table S8. Percentage of nanopores larger than 0.38 nm after post cycles of O3 etching.
  • Table S9. Gas permeance from M2 before and after O3 etching at 150°C for 10 s.
  • Table S10. Gas permeance from M4 before and after O3 etching.
  • Table S11. Comparison of H2/CH4 separation performance in this work with that in other literatures.
  • Table S12. Gas permeance from M14 (1-s plasma-treated membrane) before and after 150°C treatment used to remove contaminants.
  • References (4051)

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