Abstract: Perforated graphene or perforated graphene-based sheets can be used in forming molecular sieves. The molecular sieves can include a layer of perforated graphene or perforated graphene-based material on a polymer backing. The perforated graphene or graphene-based material and polymer backing can be spiral-wound, for example on a mandrel, to form macrotubes. Methods for producing graphene-based molecular sieves can include growing graphene or graphene-based material on a growth substrate, applying a polymer to the graphene or graphene-based material, removing the growth substrate from the graphene or graphene-based material, perforating the graphene or graphene-based material while it is on the polymer, and winding the perforated graphene or graphene-based material and the polymer into a spiral shape to form a macrotube.

Abstract: A method of manufacturing a carbon macrotube includes providing at least one layer of graphene and wrapping the at least one layer of graphene around a scaffold material to form a carbon macrotube is disclosed. In other words the carbon macrotube includes at least one layer of graphene having opposed lateral edges that are spirally wrapped around itself so as to form the macrotube.