▎ 摘　　要

NOVELTY - Preparing sulfur-nitrogen -doped graphene absorbing material comprises (a) preparing graphite oxide by Hummers method, preparing graphite oxide solution, (b) taking the sulfur and nitrogen reducing agent, adding to graphite oxide solution obtained in the step (a), heating to 80-100 degrees C for 1-3 hours, cooling, washing and filtering with deionized water, and freeze-drying to obtain a black sulfur-nitrogen doped graphene powder. USE - The method is useful for preparing sulfur-nitrogen -doped graphene absorbing material. ADVANTAGE - The method changes reaction conditions from high temperature annealing to low temperature reaction; greatly reduces energy consumption; realizes the preparation of liquid-phase easy-to-process film-forming materials and is convenient for industrial production on a large scale. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) sulfur-nitrogen -doped graphene absorbing material prepared by the above method; and (2) adjusting the absorbing performance of a sulfur-nitrogen -doped graphene absorbing material comprising adjusting the doping amount of sulfur and nitrogen reducing agents in graphene oxide to change the dielectric properties of graphene, the electromagnetic wave absorption range, width and adjusting absorption intensity of sulfur and nitrogen -doped graphene absorbing material.