▎ 摘　　要

NOVELTY - Preparing polyethylene oxide/three-dimensional graphene supported copper nanocomposite involves attaching copper nanoparticles to surface of the graphene sheet with three-dimensional structure. The particle size of the copper nanoparticles is 3-10 nanometer. The graphene oxide is dispersed in water to obtain graphene oxide-water dispersion which is referred to as GO dispersion. The copper salt is added to the GO dispersion and dispersed uniformly to obtain GO-Cu2+ mixed solution. The mass ratio of Cu2+ to the GO mass is 1:(20-40). The vitamin C is added to the GO-Cu2+ mixed solution. The mass ratio of vitamin C to GO is 1:(10-30), hydrothermally reacted at 160-200 degrees C for 22-26 hours, cleaned to obtain gel-like solid, freeze-dried at (-)10-(-)20 degrees C for 40-56 hours to obtain three-dimensional graphene loaded copper nanocomposite material, and denoted as 3D-RGO/Cu. USE - Method for preparing polyethylene oxide/three-dimensional graphene supported copper nanocomposite is used in electromagnetic shielding (claimed). ADVANTAGE - The method enables to prepare polyethylene oxide/three-dimensional graphene supported copper nanocomposite that suppresses the agglomeration of graphene sheets. DETAILED DESCRIPTION - Preparing polyethylene oxide/three-dimensional graphene supported copper nanocomposite involves attaching copper nanoparticles to surface of the graphene sheet with three-dimensional structure. The particle size of the copper nanoparticles is 3-10 nanometer. The graphene oxide is dispersed in water to obtain graphene oxide-water dispersion which is referred to as GO dispersion. The copper salt is added to the GO dispersion and dispersed uniformly to obtain GO-Cu2+ mixed solution. The mass ratio of Cu2+ to the GO mass is 1:(20-40). The vitamin C is added to the GO-Cu2+ mixed solution. The mass ratio of vitamin C to GO is 1:(10-30), hydrothermally reacted at 160-200 degrees C for 22-26 hours, cleaned to obtain gel-like solid, freeze-dried at (-)10-(-)20 degrees C for 40-56 hours to obtain three-dimensional graphene loaded copper nanocomposite material, and denoted as 3D-RGO/Cu. The 3D-RGO/copper is dispersed in solvent, mixed with polyethylene oxide powder to obtain 3D-RGO/copper/PEO after solvent evaporates.