▎ 摘　　要

NOVELTY - Process of preparing anthraquinone modified graphene flakes with maximum coverage, high purity and higher yield in a solvent free method by surface functionalization of anthraquinone at graphene flakes, involves (a) performing solvent assisted exfoliation of graphite to form high surface, less defective and higher length graphene flakes and (b) performing surface functionalization of the graphene flakes with anthraquinone by high energy ball milling method to form anthraquinone modified graphene flakes. USE - The process is useful for preparing anthraquinone modified graphene flakes with maximum coverage, high purity and higher yield for electrode for electrochemical detection of dopamine in biological samples (all claimed) and various electrochemical sensor and energy storage application. ADVANTAGE - The process characterizes the anthraquinone functionalise graphene flakes by various instrumental methods like Fourier-transform infrared spectroscopy (FT-IR), Raman, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) studies, and exploits the anthraquinone functionalised graphene flakes for the electrochemical detection of dopamine with greater sensitivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a process of preparing anthraquinone modified graphene flakes with maximum coverage, high purity and higher yield by surface functionalization of anthraquinone at graphene flakes, for use in various electrochemical sensors and energy storage applications, involving (A) performing solvent assisted exfoliation of graphite comprising of dispersing 100 mg of graphite powder in 30 ml NMP, sonically treating for 12 hours to form high surface, less-defective and higher length graphene flakes and (B) performing surface functionalization of the said graphene flakes with anthraquinone by high energy ball milling method comprising of incorporating equal amounts of diazonium salt of anthraquinone and the graphene flakes by high energy ball milling method to form anthraquinone modified graphene flakes where the formed anthraquinone modified graphene flakes is isolated and washed many times with cold water and ethanol to remove unwanted products; (2) an anthraquinone modified graphene flakes prepared by the above process; and (3) an electrode prepared from anthraquinone modified graphene flakes for electrochemical detection of dopamine in biological samples at lower detection limits and greater sensitivity, where oxidation peak of dopamine shall not overlap with oxidizable biological molecules thereby eliminating interference effects faced in detection of dopamine in anodic electrochemical oxidation process.