nl0c04989_si_001.pdf (744.66 kB)
Selective Gas Permeation in Defect-Engineered Bilayer Graphene
journal contribution
posted on 2021-03-01, 14:36 authored by Jiaman Liu, Lei Jin, Frances I. Allen, Yang Gao, Penghong Ci, Feiyu Kang, Junqiao WuDefective
graphene holds great potential to enable the permeation
of gas molecules at high rates with high selectivity due to its one-atom
thickness and resultant atomically small pores at the defect sites.
However, precise control and tuning of the size and density of the
defects remain challenging. In this work, we introduce atomic-scale
defects into bilayer graphene via a decoupled strategy of defect nucleation
using helium ion irradiation followed by defect expansion using hydrogen
plasma treatment. The cotreated membranes exhibit high permeability
and simultaneously high selectivity compared to those singly treated
by ion irradiation or hydrogen plasma only. High permeation selectivity
values for H2/N2 and H2/CH4 of 495 and 877, respectively, are achieved for optimally cotreated
membranes. The method presented can also be scaled up to prepare large-area
membranes for gas separation, e.g., for hydrogen
purification and recovery from H2/CH4 and H2/N2 mixtures.
History
Usage metrics
Categories
Keywords
CHatomic-scale defectsdefect sitesbilayer graphenedefect nucleationhydrogen plasma treatmentoptimally cotreated membraneshydrogen plasmaone-atom thicknesscotreated membranes exhibitdefect expansiondecoupled strategyion irradiationDefect-Engineered Bilayer Graphene ...helium ion irradiationgas separationSelective Gas Permeationgas moleculeshydrogen purificationHigh permeation selectivity values