▎ 摘　　要

NOVELTY - A carbon dioxide membrane filter comprises graphene sheet(s) interspersed with pores (104) that are open carbon bonds filled with an element (a). Each of the pores tipped with the element (a) making up a crown pore. USE - Carbon dioxide membrane filter is used for capturing carbon from flue gas (claimed) e.g. industrial flue gas and flue gas from power plant. ADVANTAGE - The carbon dioxide membrane filter is capable of efficiently and economically filtering the carbon dioxide from the flue gas, thereby reducing the emission of greenhouse gas into the atmosphere. When carbon dioxide is inside the pores of the graphene sheet, the electrostatic interaction becomes attractive because the positively charged carbon atom in carbon dioxide is now exposed to negatively charged oxygen atoms on the crown pore edge, and favorable interaction between carbon dioxide and the crown pore can be expected. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: a graphene sheet with at least one pore. Carbon atoms exposed at the edges of the pores are bonded with element (a) to make crown pore; fabrication of the carbon dioxide membrane filter, which involves causing ion-beam-sculpting on graphene supported by the porous substrate, and performing oxidative etching to enlarge pores in the graphene; and capturing (P1) of carbon from flue gas, which involves filtering carbon dioxide (106) from flue gas using graphene having pores tipped with oxygen. The flue gas is provided in an area of a side (s1) of the graphene, and the carbon dioxide in the flue gas is caused to be transported to an area of a side (s2) of the graphene via at least one of the pores. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of single 18-crown-6 pore in graphene. 102Hexagonal pattern 104Pores 106Carbon dioxide