▎ 摘　　要

NOVELTY - A composite material preparation method involves chemically reducing graphene oxide (GO) by utilizing ascorbic acid as reducing agent and adding polystyrene sulfonate (PSS) to reduced GO solution, as stabilizer for reduced GO (rGO) solution and counter ion for polymerization of conductive polymer-monomer, to obtain electrolytic solution. The electrolytic solution, conductive polymer-monomer and graphene are deposited on an electrode surface. The conductive polymer-monomer is co-deposited on a surface of the microelectrode by ion-bonding, followed by obtaining composite material. USE - Method for preparing composite material that is utilized for microelectrode modification. ADVANTAGE - The method enables preparing composite material by separating reduction and deposition processes of GO, improving reduction efficiency and simplifying deposition process, effectively reducing alternating current impedance of microelectrode and improving charge storage capacity of the microelectrode, thus improving electrical stimulation and electrical recording performance of microelectrode. DETAILED DESCRIPTION - A composite material preparation method involves chemically reducing graphene oxide (GO) by utilizing ascorbic acid as reducing agent and adding polystyrene sulfonate (PSS) to reduced GO solution, as stabilizer for reduced GO (rGO) solution and counter ion for polymerization of conductive polymer-monomer to obtain electrolytic solution. The electrolytic solution, conductive polymer-monomer and graphene are deposited on electrode surface by electrochemical method. The conductive polymer-monomer is co-deposited on surface of the microelectrode by ion-bonding with the counter ion and rGO after polymerization and followed by obtaining composite material for microelectrode modification, namely poly(3,4-ethylenedioxythiophene) (PEDOT):PSS-rGO composite film.