▎ 摘　　要

NOVELTY - A graphene quantum dots sensor is prepared by preparing purified graphene quantum dots after drying. Fluorescence chemical sensor thin plate is prepared followed by immersing quartz plate in graphene quantum dots and carboxymethyl chitosan mixed solution for 3-30 min to obtain graphene quantum dots having strong fluorescence signal fluorescence plate, immersing graphene quantum dot fluorescence plate in creatinine solution for 10-60min, forming graphene quantum dot light sheet surface creatinine molecular functional layer, washing distilled water, drying to obtain product. USE - Graphene quantum dots sensor for detecting trinitrophenol explosive (claimed). ADVANTAGE - The sensor has good photochemical stability, and broad application prospects in safety testing, environmental monitoring and other aspects. DETAILED DESCRIPTION - A graphene quantum dots sensor is prepared by doping graphene quantum dots nitrogen into microwave synthesizer, mixing 1-2g 0.01-1 mL ammonia with citric acid, microwave heating at 160-210 degrees C for 0.5-2h, to obtain nitrogen-doped graphene quantum dots, pouring resulting graphene quantum dots into distilled water, adding 30-40% sodium hydroxide solution, the pH of the solution adjusted to 6- 8, transferring to dialysis bags, at room temperature with shaking dialysis for 20-24h, respectively, mixing with distilled water and ethanol, washing product, to obtain purified graphene quantum dots after drying for 4-6h under vacuo at 60-80 degrees C. Fluorescence chemical sensor thin plate is prepared by mixing prepared graphene quantum dots and 5-50mg / mL carboxymethyl chitosan solution at 20-30 degrees C for 5-60 min to give a uniform dispersion solution, adding sulfuric acid-hydrogen peroxide mixture medium on the quartz plate, boiling at 100 degrees C for 20-30 min, complete silane-activated, followed by immersing quartz plate in graphene quantum dots and carboxymethyl chitosan mixed solution for 3-30 min to obtain graphene quantum dots having strong fluorescence signal fluorescence plate, immersing graphene quantum dot fluorescence plate in 0.1-5mmol / L creatinine solution for 10-60min, forming graphene quantum dot light sheet surface creatinine molecular functional layer, washing distilled water for 2 or 3 times, drying by high-purity nitrogen for 20-30min to obtain product. An INDEPENDENT CLAIM is also included for use of graphene quantum dots sensor for detecting trinitrophenol.