▎ 摘　　要

NOVELTY - A cobalt sulfide/nitrogen-doped graphene composite material electrochemical sensor preparing method involves dispersing oxidized graphene in distilled water ultrasonically using ammonia water to adjust the pH of graphene oxide dispersion liquid, heating and refluxing to obtain a treated material. The treated material is dispersed with cobalt nitrate hexahydrate and L-cysteine in reaction kettle for carrying out hydro-thermal reaction and separated centrifugally. The resultant material is washed with distilled water and ethanol and dried in vacuum drying box to obtain he finished product. USE - Method for preparing cobalt sulfide/nitrogen-doped graphene composite material electrochemical sensor that is utilized in glucose electrochemical analysis. ADVANTAGE - The method enables preparing the cobalt sulfide/nitrogen-doped graphene composite material electrochemical sensor with low reagent dosage, low energy consumption, large specific surface area, high thermal stability, high electrical conductivity, better catalytic effect, high sensitivity and high selectivity detection trace glucose, in a simple, convenient and eco-friendly manner.