▎ 摘　　要

NOVELTY - Preparation of ultraclean graphene comprises considering gas path from upstream to downstream direction, placing copper acetate and copper substrates at intervals and introducing hydrogen for chemical vapor deposition where temperature of copper acetate in the temperature zone is volatilization temperature of copper acetate. USE - Method for preparing ultraclean graphene (claimed). ADVANTAGE - The method is simple and has easy to get raw materials. The product is suitable for optical and electrical field and has high quality.