▎ 摘　　要

NOVELTY - Preparing gold nanoparticle/nitrogen doped graphene quantum dot nano composite material comprises (a) dissolving citric acid and urea in water, reacting at 120-176 degrees C to 200-176 degrees C, (b) cooling to room temperature, dialyzing to remove unreacted chemical substance, freezing and drying to obtain the nitrogen-doped graphene quantum dot, taking the nitrogen-doped graphene quantum dot dissolved in water to obtain nitrogen-doped graphene quantum dot solution, (c) heating and refluxing the nitrogen-doped graphene quantum dot solution, dropping chloroauric acid solution to react, cooling to room temperature, centrifuging to obtain the gold nanoparticle/nitrogen doped graphene quantum dot nano composite material. USE - The method is useful for preparing gold nanoparticle/nitrogen-doped graphene quantum dot nano composite material, which is useful in sensor electrode for detecting hydrogen peroxide and biosensing electrode for glucose detection (all claimed). ADVANTAGE - The method enables to prepare gold nano particle/nitrogen doped graphene quantum dot nano composite material which has good stability and biological compatibility. The detection of the glucose has high sensitivity, wide linear range, further modifying the glucose oxidase on the surface of the sensing electrode to obtain the biological sensing electrode. The detection of the glucose has excellent selectivity and sensitivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a gold nanoparticle/nitrogen-doped graphene quantum dot nanocomposite material; (2) a method for preparing a sensor electrode based on a gold nanoparticle/nitrogen-doped graphene quantum dot nanocomposite material; (3) a sensor electrode; (4) a preparation method of biosensor electrode; and (5) a biosensing electrode.