▎ 摘　　要

NOVELTY - Preparing graphene single-crystal involves carrying out low pressure chemical vapor deposition for growing copper foil on the substrate. The methane is utilized as reaction precursor and hydrogen is utilized as reducing gas. The copper foil is cleaned with polishing liquid and heated to ensure that no gas acts as a barrier. The copper foil is annealed for 2-3 hours to obtain graphene single-crystal having 1mm large specific area. USE - Method for preparing graphene single-crystal (claimed). ADVANTAGE - The method enables to prepare graphene single-crystal in simple manner that has low number of defects.