▎ 摘　　要

NOVELTY - Preparing monodisperse manganese oxide/reduced graphene oxide composite material, comprises (1) taking pre-processed reduced graphene oxide and manganese oleate precursors in 100 ml three-necked flask, and adding octadecene, oleylamine and oleic acid; (2) introducing nitrogen before the reaction, raising the temperature to 120℃ for 1 hour, alternately vacuumizing and introducing nitrogen gas for multiple times, and vigorously magnetic stirring to remove water, oxygen and other low-boiling point in reactant; (3) raising the temperature of the system temperature to target temperature; and (4) adding normal hexane to the liquid after the reaction, ultrasonically dispersing, transferring to centrifugal tube, using ethanol to centrifuge and wash, repeating ultrasonication and centrifugation for multiple times, washing surfactant and other impurities, and drying at low temperature in constant temperature blast drying oven for absorption test of electromagnetic waves. USE - The method is useful for preparing monodisperse manganese oxide/reduced graphene oxide composite material for electromagnetic wave absorption. ADVANTAGE - The material has excellent electromagnetic wave absorption performance, provides more interface polarization active site, and enhances the interface polarization effect. The method is simple and cost-effective.