▎ 摘　　要

NOVELTY - Preparation of enzyme-free glucose sensor electrode composite nanomaterial involves polishing glassy carbon electrode with alpha -alumina powder, cleaning with distilled water and ethanol for 2 minutes, and naturally drying; subjecting modified Hummers method, centrifugal separating, drying, adding 300-350 mL distilled water, ultrasonically stripping for 2-4 hours, centrifuging, and diluting to 2 mg/L graphene oxide dispersion; and adding 3,4-ethylenedioxythiophene conductive polymer monomer at volume ratio of 500:1, and magnetically stirring for 2 hours to get second dispersion. USE - Method for preparing electrode composite nanomaterial used for enzyme-free glucose sensor (claimed) for food industry analysis. ADVANTAGE - The composite nanomaterial has good response for glucose detection, low detection limit of 0.6 mu mol/L, wide detecting range of 2-7.8 mu mol/L, and good anti-interference ability, stability and repeatability. DETAILED DESCRIPTION - Preparation of enzyme-free glucose sensor electrode composite nanomaterial comprising: (A) polishing glassy carbon electrode with alpha -alumina powder, cleaning with distilled water and ethanol for 2 minutes, and naturally drying; (B) subjecting modified Hummers method, centrifugal separating, drying, adding 300-350 mL distilled water, ultrasonically stripping for 2-4 hours, centrifuging, and diluting to 2 mg/L graphene oxide dispersion; (C) adding 3,4-ethylenedioxythiophene conductive polymer monomer at volume ratio of 500:1, and magnetically stirring for 2 hours to get second dispersion; (D) using glassy carbon electrode as working electrode, saturated calomel electrode as reference electrode, and platinum wire electrodes to constitute three-electrode system, adding second dispersion, electrodepositing using cyclic voltammetry, washing with secondary distilled water, and drying working electrode; and (E) using as working electrode, adding 0.1 mol/L nickel nitrate, subjecting to potentiostatic electrodeposition, washing, and drying.