▎ 摘　　要

NOVELTY - Multifunctional graphene quantum dot detecting agent is prepared by dissolving p-phenylenediamine in alcohol to heat to obtain graphene quantum dot solution, dropping graphene quantum dot solution on test paper, and then dispersing graphene quantum dot into test paper, volatilizing solvent to obtain detection test paper. The detected test paper is red under excitation of ultraviolet light. USE - Multifunctional graphene quantum dot detecting agent used for detecting formaldehyde in test paper. ADVANTAGE - The multifunctional graphene quantum dot detecting agent emits intense red fluorescence under the excitation of UV light, and effectively improves detection lower limit of the detection test paper. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for using multifunctional graphene quantum dot detection agent, which involves manufacturing color comparison card, and then comparing detection test paper with the color comparison card under excitation of ultraviolet light to determine the formaldehyde concentration.