Method for preparing magnetic iron oxide-graphene composite
AssigneeLG Chem, Ltd.
InventorsSe Ho Park, Kwon Nam Sohn, Won Jong Kwon, Seung Bo Yang
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Abstract
The present invention relates to a method for preparing a magnetic iron oxide-graphene composite, a magnetic iron oxide-graphene composite prepared thereby and a composition for electromagnetic wave shielding including the same, and since graphene is prepared from a stage 1-GIC using FeCl3, magnetic particles in the form of FeOx are naturally formed on the surface of graphene during the preparation process. In addition, a magnetic material is formed on the surface of graphene while the defects of graphene are minimized, and thus the magnetic iron oxide-graphene composite prepared according to the present invention can be useful as an electromagnetic wave absorber.
Claims11
A method for preparing a magnetic iron oxide-graphene composite comprising the steps of:
- mixing graphite and a halogen salt of iron and heat-treating the same (Step 1);
- reacting the product of step 1 with a (C1-20 alkyl) amine (Step 2);
- washing the product of step 2 (Step 3);
- subjecting the product of step 3 to a high-speed homogenization (Step 4);
- and
- subjecting the product of step 4 to sonication or a high-pressure homogenization (Step 5),
- wherein the high-speed homogenization of step 4 is carried out by stirring the product of Step 2 at 5000 to 8000 rpm,
- wherein the high-pressure homogenization of step 5 is carried out by passing the product of step 4 through a high-pressure homogenizer including an inlet, an outlet, and a micro-channel that connects between the inlet and the outlet and has a diameter in a micrometer scale,
- wherein the product of step 4 is introduced to the inlet of the high-pressure homogenizer under application of a pressure of 500 to 3000 bar and passes through the micro-channel.
Dependencies are inferred from the claim text.