▎ 摘　　要

NOVELTY - Preparing large single crystals of graphene involves annealing copper substrate in low reducing atmosphere to obtain the copper substrate and then treating the copper substrate with triazine derivative in steam atmosphere, where the triazine derivative is melamine, 2,4-diamino-6-methyl-1,3,5-triazine or 2-amino-4-methyl-6-methoxy-1,3,5-triazine. The treated material is subjected for gas phase deposition process to obtain the desired product. USE - Method for preparing large single crystals of graphene (claimed). ADVANTAGE - The method enables to prepare large single crystals of graphene in simple manner, and with high quality.