▎ 摘　　要

NOVELTY - Polar polymer doped nanoparticle comprises polar polymer precursor and inorganic ferric chloride salt in mass ratio of (0.08-0.39):2.7, where polar polymer precursor is potassium 2,5-dihydroxybenzenesulfonate, 2-(bis(4-hydroxyphenyl)methyl)benzoic acid, 2,6-difluorobenzonitrile and anhydrous potassium carbonate. USE - Used as polar polymer doped nanoparticle. ADVANTAGE - The nanoparticle improves the electromagnetic absorption performance of the nanometre magnetic material; and electromagnetic wave absorbing performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing polar polymer doped nanoparticle comprising (i) adding raw materials of the polar polymer-doped nanoparticles,(ii) dissolving inorganic ferric chloride salt, crystalline sodium acetate, and polyethylene glycol in ethylene glycol to obtain an inorganic ferric chloride salt solution, dissolving the polar polymer precursor in an organic solvent to obtain a polar polymer precursor solution, and (iii) mixing inorganic ferric chloride salt solution and the polar polymer precursor solution, and placing them in a closed container for in-situ solvothermal reduction reaction after they are uniformly mixed, separating, washing, and drying to obtain polar polymerization and doping with nanoparticles; and (2) composite containing the polar polymer-doped nanoparticles or the polar polymer-doped nanoparticles prepared by the method preparation method of the wave absorbing material comprising (a) adding polar polymer-doped nanoparticles to deionized water for mechanical stirring and ultrasonic treatment to obtain dispersion A and adding functionalized reduced graphene oxide to deionized water for mechanical stirring and ultrasonic treatment to obtain dispersion B and (b) adding dispersion liquid B dropwise to the dispersion liquid A under the condition of mechanical stirring, filtering, washing, and drying.