▎ 摘　　要

NOVELTY - The preparation method of reduced graphene/ferroferric oxide/noble metal nano composite material involves adding magnetic ferroferric oxide nano sol to polyacrylic acid or polyethyleneimine solution, and stirring to obtain polyacrylic acid or polyethyleneimine modified magnetic ferroferric oxide nano sol, adding reduced graphene ethanol dispersion liquid to polyacrylic acid or polyethyleneimine solution, and stirring to obtain polyacrylic acid or polyethyleneimine modified reduced graphene, mixing obtained magnetic ferroferric oxide nano sol and reduced graphene. USE - Preparation of reduced graphene/ferroferric oxide/noble metal nano composite material for use as surface-enhanced Raman agent and electrochemical catalytic material (all claimed), and in biosensor. ADVANTAGE - The method enables preparation of reduced graphene/ferroferric oxide/noble metal nano composite material with excellent surface-enhanced Raman-active and electro-catalytic activity. DETAILED DESCRIPTION - The preparation method of reduced graphene/ferroferric oxide/noble metal nano composite material involves (1) adding magnetic ferroferric oxide nano sol to polyacrylic acid or polyethyleneimine solution, and stirring to obtain polyacrylic acid or polyethyleneimine modified magnetic ferroferric oxide nano sol, (2) adding reduced graphene ethanol dispersion liquid to polyacrylic acid or polyethyleneimine solution, and stirring to obtain polyacrylic acid or polyethyleneimine modified reduced graphene, (3) mixing polyacrylic acid or polyethyleneimine modified magnetic ferroferric oxide nano sol obtained in step (1) and polyacrylic acid or polyethyleneimine modified reduced graphene obtained in step (2), heat-preserving at room temperature, and adding 3-mercaptopropyl trimethoxysilane to obtain magnetic ferroferric oxide modified reduced graphene, and (4) adding noble metal nano-sol to ferroferric oxide modified reduced graphene, heat-preserving at room temperature, and centrifuging. An INDEPENDENT CLAIM is included for application of reduced graphene/ferroferric oxide/noble metal nano composite material as surface-enhanced Raman agent and electrochemical catalytic material.