▎ 摘　　要

NOVELTY - Preparation of three-dimensional composite material involves dispersing graphene oxide and tannic acid in water at room temperature, forming precursor solution, heating the precursor solution to more than 80 degrees C, cooling to room temperature, obtaining tannic acid-modified graphene, immersing resultant product in tetrachloroauric acid aqueous solution, and reacting. USE - Preparation of three-dimensional composite material used in catalytic and sensing applications, and for surface enhanced Raman substrate. ADVANTAGE - The method enables environmentally-friendly, economical, simple and easy preparation of three-dimensional composite material having excellent conductivity and biocompatibility, and large surface area, under mild reaction conditions.