Selective Gas Transport through Few-Layered Graphene and Graphene oxide membranes

Abstract: Here we demonstrate that gas molecules can diffuse through defective pores and slitlike channels in few-layered graphene and several layered graphene oxide (GO) membranes. Gas diffusion through these membranes can be selectively tuned by engineering gas flow channels and pores via different stacking method. In particular, several layered (3-10 nm) GO membranes exhibited tunable gas transport behavior that was strongly dependent on the degree of interlocking within the GO stacking structure. Amongst gases tested in this study, CO2 permeability is affected by the most by the GO stacking structure morphology. Furthermore, by changing the relative humidity in the feed stream, very high CO2/N2, CO2/CH4, and CO2/H2 (or H2/CO2) selectivity can be achieved, making GO a promising membrane material for important industrial CO2 separation applications.

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