▎ 摘　　要

NOVELTY - A gas separation membrane comprises porous support which is deposited a nanoporous single-layer graphene film with a carbon dioxide-philic polymer film having a thickness of 5-100 nm coated on top of graphene nanopores, acting as a carbon dioxide-selective film, where the carbon dioxide-philic polymer is swollen with another low molecular-weight carbon dioxide-philic polymer. USE - Gas separation membrane for use in composite filter membranes for carbon dioxide capture. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for manufacturing gas separation membrane, which involves synthesizing monolayer graphene on a copper foil, incorporating nanopores in the graphene lattice, functionalizing the graphene surface with oxidative groups, coating graphene with a carbon dioxide-philic polymer layer, coating the resulting film in with poly(1-trimethylsilyl-1-propyne) to improve the mechanical strength of the film allowing crack-free transfer, removing copper by chemical etching, swelling the carbon dioxide-philic polymer layer with a low molecular-weight carbon dioxide-philic polymer, and transferring the resulting film onto a porous support.