Single-layer graphene membranes by crack-free transfer for gas mixture separation.

ABSTRACT: The single-layer graphene film, when incorporated with molecular-sized pores, is predicted to be the ultimate membrane. However, the major bottlenecks have been the crack-free transfer of large-area graphene on a porous support, and the incorporation of molecular-sized nanopores. Herein, we report a nanoporous-carbon-assisted transfer technique, yielding a relatively large area (1 mm²), crack-free, suspended graphene film. Gas-sieving (H₂/CH₄ selectivity up to 25) is observed from the intrinsic defects generated during the chemical-vapor deposition of graphene. Despite the ultralow porosity of 0.025%, an attractive H₂ permeance (up to 4.1 × 10^-7 mol m^-2 s^-1 Pa^-1) is observed. Finally, we report ozone fu

SUBMITTER: Huang S 

PROVIDER: S-EPMC6035196 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature