▎ 摘　　要

NOVELTY - Ferrocene-grafted polyethyleneimine-graphene composite material is prepared by reacting ferrocene formaldehyde and polyethyleneimine to obtain grafted reaction product, reducing the grafted reaction product to obtain ferrocene-grafted polyethyleneimine, dispersing graphite oxide in a solvent to obtain graphene oxide solution, and reacting ferrocene-grafted polyethyleneimine and graphene oxide solution to prepare the product. USE - Ferrocene-grafted polyethyleneimine-graphene composite material used for electrochemical biosensor. ADVANTAGE - The ferrocene-grafted polyethyleneimine-graphene composite material has high electric conductivity, large specific surface area, and good electrochemical activity. DETAILED DESCRIPTION - Ferrocene-grafted polyethyleneimine-graphene composite material is prepared by reacting ferrocene formaldehyde and polyethyleneimine to obtain grafted reaction product, reducing the grafted reaction product to obtain ferrocene-grafted polyethyleneimine, dispersing graphite oxide in a solvent to obtain graphene oxide solution, and reacting ferrocene-grafted polyethyleneimine and graphene oxide solution to prepare the product, where polyethyleneimine is of formula -(N(H)-CH2-CH2)x-CH2-(N(CH2-CH2-NH2)-CH2-CH2)y-. x, y=345-2414.