▎ 摘　　要

NOVELTY - Flame retardant comprises graphene oxide where phosphorus component is doped on the surface. USE - The flame retardant is useful in a fire retardant fabric (claimed). ADVANTAGE - The flame retardant: when coated on a subject such as fabric, forms a layer that prevents transfer of heat in combustion; can effectively prevent fire without a change of the surface, except for a little shrinkage, has remarkable durability without forming any toxic material which can be harmful to a human and environment; can be mass-produced with low price; and can be applied to the various industrial fields. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing a flame retardant, comprising preparing graphene oxide in the chamber, and adding phosphoric acid, and/or polyphosphoric acid to the chamber to dope the phosphorus component on the surface of the graphene oxide; and (2) coating a flame retardant, comprising preparing graphene oxide in a chamber, adding at least one of phosphorus component of phosphoric acid and polyphosphoric acid, and the basic material to the chamber to dope the phosphorus component on the surface of the graphene oxide under a condition of pH 1-5, and coating graphene oxide where the phosphorus component is doped on the surface of a subject.