▎ 摘 要
NOVELTY - A filter comprises porous base material (20) and graphene film (10) which covers surface of base material and is formed from stacked graphene molecules (1), where a part of graphene molecules is graphene oxide molecule and remainder is non-oxidized graphene molecule. USE - A filter. ADVANTAGE - The filter is easy to produce and is cheap. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the method to produce a filter. Graphene molecule (1) Graphene film (10) Base material (20) Pore (20a) Opening part (20b)