▎ 摘　　要

NOVELTY - A nonlinear optical material comprises polypyrrole derivative covalently-functionalized graphene (I) obtained by covalently modifying hydroxylated polypyrrole derivative on surface of a reduced graphene oxide. USE - Nonlinear optical material (claimed). ADVANTAGE - The nonlinear optical material has excellent nonlinear optical absorption property due to the presence of graphene having excellent solubility and dispersion stability in polar organic solvents, and can be prepared by easy method. DETAILED DESCRIPTION - A nonlinear optical material comprises polypyrrole derivative covalently-functionalized graphene of formula (I) obtained by covalently modifying hydroxylated polypyrrole derivative on surface of a reduced graphene oxide. An INDEPENDENT CLAIM is included for preparation of nonlinear optical material, which involves preparing acyl chlorinated graphene (GOC(O)Cl) by adding oxidized graphene to a mixed solvent of thionyl chloride and N,N'-dimethylformamide under nitrogen protection, reacting, cooling the resultant product, filtering, washing, and obtaining acyl chlorinated graphene as a black powder, preparing hydroxylated polypyrrole derivative (PPy-OH) by adding pyrrole and p-hydroxybenzaldehyde to deionized water, ultrasonically homogenizing, adding ammonium persulfate oxidant, polymerizing, filtering the reaction product, washing, and obtaining hydroxylated polypyrrole derivative as a black powder, preparing polypyrrole derivative-functionalized graphene nano-hybrid material (GO-Ppy) by suspending the acyl chlorinated graphene and the hydroxylated polypyrrole derivative in an organic polar solvent and an acid-binding agent under ultrasonic conditions, esterifying under nitrogen protection, cooling the reaction product, filtering and washing, suspending the in an organic polar solvent under ultrasonic conditions, performing thermal reduction reaction under nitrogen protection, cooling the reaction product, filtering, washing, and drying.