▎ 摘　　要

NOVELTY - Method for preparing molybdenum disulfide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate, involves (a) performing hydrothermal reaction on aminopyrene in sodium hydroxide aqueous solution to obtain nitrogen-doped graphene quantum dot solution, (b) performing vacuum suction filtration on nitrogen-doped graphene quantum dot solution, and performing self-assembly, (c) soaking nitrogen-doped graphene film in tetrahydrofuran solution of 2,4-heptadiyne-1-ol, performing esterification reaction, and performing polymerization reaction, (d) ultrasonically dispersing obtained nitrogen-doped graphene-2,4-heptadiyne-1-ol film in water, adding silver nitrate for magnetic stirring, and adding sodium citrate solution, and (e) adding sodium molybdate and cysteine to dispersion solution of nitrogen-doped graphene-2,4-heptadiyne-1-ol thin film with silver/gold nanoparticles on surface, uniformly mixing, reacting, separating and purifying. USE - The method is used for preparing molybdenum disulfide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate (claimed). ADVANTAGE - The method improves the defects of large background noise signal, insufficient detection signal strength and poor sensitivity in common graphene-based surface enhanced Raman substrate, and the prepared substrate has high detection signal strength and excellent detection accuracy and sensitivity. DETAILED DESCRIPTION - Method for preparing molybdenum disulfide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate, involves (a) performing hydrothermal reaction on aminopyrene in sodium hydroxide aqueous solution to obtain nitrogen-doped graphene quantum dot solution, (b) performing vacuum suction filtration on nitrogen-doped graphene quantum dot solution obtained in step (a), and performing self-assembly to obtain nitrogen-doped graphene film of self-supporting structure, (c) soaking obtained nitrogen-doped graphene film in a tetrahydrofuran solution of 2,4-heptadiyne-1-ol, performing esterification reaction, and performing polymerization reaction using UV irradiation to obtain nitrogen-doped graphene-2,4-heptadiyne-1-ol film, (d) ultrasonically dispersing obtained nitrogen-doped graphene-2,4-heptadiyne-1-ol film in water, adding silver nitrate for magnetic stirring, adding sodium citrate solution, and controlling the temperature at 80-90 degrees C for 30 minutes until the solution becomes dark green to obtain dispersion liquid of nitrogen-doped graphene-2,4-heptadiyne-1-ol film with surface modified with silver nanoparticles, and (e) adding sodium molybdate and cysteine to dispersion solution of nitrogen-doped graphene-2,4-heptadiyne-1-ol thin film with silver/gold nanoparticles on surface obtained in step (d), uniformly mixing, reacting at 180-100 degrees C for 8-12 hours, separating and purifying to obtain the substrate.