▎ 摘　　要

NOVELTY - Fluorescence sensor comprises solution, which is prepared by dissolving a graphene composite material in a solvent at a concentration of 1 x 10-4-1 x 10-6 mol/L. The graphene composite material comprises graphene and polymer (I), where polymer (I) is modified in the form of a non-covalent bond to the graphene. USE - Fluorescence sensor for rapid detection of explosives such as 2,4-dinitrotoluene, 2,4,6-trinitrotoluene, p-nitrophenol, p-nitrotoluene and nitromethane (all claimed). ADVANTAGE - The fluorescence sensor has linear fluorescence intensity with the concentration of nitro-containing explosives, which is quantitatively detected, has good fluorescence characteristics and aggregation-induced emission effect, which realizes trace quantitative detection of picric acid, has high sensitivity, low cost and rapid detection with good application prospect. DETAILED DESCRIPTION - Fluorescence sensor comprises solution, which is prepared by dissolving a graphene composite material in a solvent at a concentration of 1 x 10-4-1 x 10-6 mol/L. The graphene composite material comprises graphene and polymer (I), where polymer (I) is modified in the form of a non-covalent bond to the graphene. INDEPENDENT CLAIMS are included for: (1) a method for preparing fluorescence sensor, which involves preparing graphene composites by forming a polymer of formula (I) into a polymer solution; (2) mixing the oxidized graphene dispersion with the polymer solution, adding hydrazine hydrate to reflux reaction, and after the reaction, by ultrasonic and centrifugal separation, removing the supernatant to remove the solvent and drying, (3) dissolving the graphene composite in a solvent to form a solution having a concentration of 1 x 10-4-1 x 10-6 mol/L; and (4) a method for rapidly detecting an explosive using a fluorescence sensor, which involves mixing the fluorescent sensor with the analyte to obtain a fluorescence emission spectrum of the mixture and when the analyte is an explosive, the fluorescence intensity of the mixture is significantly lower than that of the original fluorescence sensor. n=8 to 20; and R1, R2=1-6C alkyl, 1-6C alkoxy or hydrogen.