▎ 摘　　要

NOVELTY - A copper foil (10) comprises 5x 10-9 weight ppm or less sulfur, 5.5x 10-9 weight ppm or less oxygen, 8.5x 10-11 weight ppm or less copper, and 1x 10-8 weight ppm or less oxygen gas, when copper foil is heated from room temperature to 950 degrees C under vacuum of 5x 10-5 or less, and maintained under vacuum. USE - Copper foil is used for manufacturing graphene (claimed). Uses include but are not limited to separator for fuel cells, transparent electrode, conductive thin film of display element, mercury-free fluorescent lamp, composite material, and carrier of drug delivery system. ADVANTAGE - The copper foil enables stable manufacture of graphene. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of graphene (20), which involves supplying hydrogen gas and carbon-containing gas to heated copper foil arranged in interior of predetermined chamber (100), forming graphene on surface of the copper foil, and etching away the copper foil while laminating a transfer sheet (30) on the surface of the graphene and transferring the graphene on the transfer sheet. DESCRIPTION OF DRAWING(S) - The drawing shows a process drawing explaining the manufacture of graphene. Copper foil (10) Graphene (20) Transfer sheet (30) Predetermined chamber (100) Etching tank (110)