Implications of Permeation through Intrinsic Defects in Graphene on the Design of Defect-Tolerant Membranes for Gas Separation
Author(s)Sun, Chengzhen; O’Hern, Sean C.; Au, Harold; Boutilier, Michael Stephen Hatcher; Hadjiconstantinou, Nicolas; Karnik, Rohit; ... Show more Show less
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Gas transport through intrinsic defects and tears is a critical yet poorly understood phenomenon in graphene membranes for gas separation. We report that independent stacking of graphene layers on a porous support exponentially decreases flow through defects. On the basis of experimental results, we develop a gas transport model that elucidates the separate contributions of tears and intrinsic defects on gas leakage through these membranes. The model shows that the pore size of the porous support and its permeance critically affect the separation behavior, and reveals the parameter space where gas separation can be achieved regardless of the presence of nonselective defects, even for single-layer membranes. The results provide a framework for understanding gas transport in graphene membranes and guide the design of practical, selectively permeable graphene membranes for gas separation.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
American Chemical Society (ACS)
Boutilier, Michael S. H., Chengzhen Sun, Sean C. O’Hern, Harold Au, Nicolas G. Hadjiconstantinou, and Rohit Karnik. “Implications of Permeation through Intrinsic Defects in Graphene on the Design of Defect-Tolerant Membranes for Gas Separation.” ACS Nano 8, no. 1 (January 28, 2014): 841–849.
Author's final manuscript