Preparation of copper-cobalt-nickel ferrite/graphene oxide/polyaniline composite and its applications in microwave absorption coating

A copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was prepared by a two-step method. The prepared tri-composite was used as the absorbing agent and waterborne-polyurethane as matrix which coated on cotton fabric to prepare a flexible absorbing material. The absorbing property and electromagnetic shielding performance of the coated fabrics were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), anti-electromagnetic radiation and vector network analyzer. Compared with polyaniline and graphene oxide, the microwave absorption capacity of the copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was significantly enhanced, which can achieve to -33 dB at 10.8 GHz. When the content of coating agent was 40 % and thickness of the coated fabric was 2.0 mm, the shielding performance could reach -47 dB in the frequency of 300 kHz to 3.0 GHz. Meanwhile, the mechanical property was better than that of uncoated cotton fabric.