▎ 摘　　要

NOVELTY - Membrane (100) comprises: a porous polymer substrate (102); and at least a first layer of graphene platelets supported by the substrate, where the graphene platelets of the first layer comprise aminated graphene platelets. USE - The membrane is useful in water filtration and purification and for forming conductive surfaces (e.g. for use in batteries), optionally with intercalated ions on or within those surfaces. ADVANTAGE - The membrane is water permeable, ion impermeable, and conductive of heat and electricity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (a) making (M1) a membrane, comprising (a) providing a porous polymer substrate, (b) providing a first suspension of graphene platelets in a fluid, where the graphene platelets of the first suspension are aminated graphene platelets and (c) applying the first suspension to the substrate to deposit a layer of the aminated graphene platelets on the substrate; and (b) making (M2) a substrate for a graphene membrane, comprising (a1) providing a sheet of a porous polymer, (b1) treating the sheet of porous polymer with an acid to impart a negative charge to the sheet of porous polymer and (c1) treating the charged surface with at least one metal ion. DESCRIPTION OF DRAWING(S) - The figure shows schematic view of membrane. Membrane (100) Substrate (102) Pores (106) Second layer (110)