▎ 摘　　要

NOVELTY - Preparation of graphene dispersion liquid by directly covalently modifying graphene involves mixing graphene and solvent to obtain graphene slurry, two-step ultrasonically treating to obtain graphene dispersion, adding alkylamine-modified material, covalent bond modifying, and ultrasonically processing. USE - The method is used for preparing graphene dispersion liquid by directly covalently modifying graphene. ADVANTAGE - The product has large sheet area of graphene nanosheet in graphene xylene dispersion, couple of layers and less defect. The method has simple technical process and easy to repeat, and realizes mass production and industrialization.