▎ 摘　　要

NOVELTY - The method involves heating a flat substrate. A thin film is arranged on a surface of the substrate by exposing the substrate to chemical vapor deposition. The substrate is cooled to room temperature. A flat mat shaped separator material (102) is provided. The separator material is positioned adjacent to and in an overlying relationship with the substrate to form a composite. The composite is winded to provide a coiled substrate using a cylindrical shaped winding tool (106) e.g. hollow tube or solid rod, where the winding tool is placed into a reactor to grow graphene on the substrate. USE - Method for synthesizing a graphene thin film using chemical vapor deposition. ADVANTAGE - The method enables synthesizing graphene films of copper foils, which are more flexible, reused for more times and smooth while achieving many-fold increase in effective width of the substrate. DETAILED DESCRIPTION - The separator material is composed of substance (100) selected from a group consisting of fused quartz wool, ceramic insulation, silica fabric and a graphite foil. The thin film is selected from a group consisting of graphene and boron nitride. The substrate is composed of metallic foil comprising copper. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a separator material overlying a surface of a metallic substrate and a structure allowing rolling or winding of the separator material together with a metallic substrate to form a cylindrical coiled composite using a tool to effectuate the winding. Substance (100) Flat mat shaped separator material (102) Cylinderical shape winding tool (106)