▎ 摘　　要

NOVELTY - Preparation of cuprous oxide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate, involves (a) performing hydrothermal reaction of aminopyrene in an sodium hydroxide solution to obtain a nitrogen-doped graphene quantum dot solution, (b) filtering the dot solution in step (a) for self-assembly to obtain a nitrogen-doped graphene film (NG) with a self-supporting structure, (c) immersing it in a solution of 2,4-heptadien-1-ol (HDO) in tetrahydrofuran for esterification, irradiating with UV rays, and polymerizing to obtain NG-HDO film, (d) dispersing it in water, adding silver nitrate for magnetic stirring, and keeping the temperature until the solution turns dark green to obtain a dispersion of NG-HDO film with silver nanoparticles modified on the surface, and (e) adding copper sulfate to the dispersion in step (d), adding sodium carbonate, polyvinylpyrrolidone, and glucose, reacting until the solution is brick red, cooling, separating and purifying. USE - The method is used for preparation of cuprous oxide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate (claimed). ADVANTAGE - The method improves the defects of large background noise signal, detection signal strength, and sensitivity in ordinary graphene-based surface-enhanced Raman substrates, and obtain a high detection signal strength. The obtained substrate has excellent detection accuracy and sensitivity. DETAILED DESCRIPTION - Preparation method of cuprous oxide-silver-nitrogen-doped graphene nanocomposite surface-enhanced Raman substrate, involves (a) performing hydrothermal reaction of aminopyrene in an aqueous sodium hydroxide solution to obtain a nitrogen-doped graphene quantum dot solution, (b) performing vacuum filtration of the nitrogen-doped graphene quantum dot solution obtained in step (a) for self-assembly to obtain a nitrogen-doped graphene film (NG) with a self-supporting structure, (c) immersing the NG film obtained in step (b) in a solution of 2,4-heptadien-1-ol (HDO) in tetrahydrofuran for esterification, then irradiating with UV rays, and performing addition polymerization reaction to obtain NG-HDO film, (d) ultrasonically dispersing the NG-HDO film in water, adding silver nitrate for magnetic stirring, adding sodium citrate solution, controlling the temperature at 80-90 degrees C, and keeping the temperature for 30 minutes until the solution turns dark green to obtain a dispersion of NG-HDO film with silver nanoparticles modified on the surface, and (e) adding copper sulfate to the dispersion of the NG-HDO film obtained in step (d), adding sodium carbonate and polyvinylpyrrolidone, adding glucose solution, reacting at 80-100 degrees C until the solution is brick red, and cooling to room temperature, separating and purifying to obtain the Raman substrate.