Synthesis of graphene@branching-like polypyrrole@CoFe₂O₄ composites and their excellent electromagnetic wave absorption properties

In order to expand the scope of electromagnetic wave absorbers, the ternary composites composed of graphene, branching-like polypyrrole and CoFe₂O₄ nanoparticles were synthesized. TEM results indicated that polypyrrole on the surface of graphene had a branching-like geometrical morphology and the diameter of CoFe₂O₄ nanoparticles ranged from 5 to 15 nm. The electromagnetic wave absorbability revealed that the ternary composites exhibited excellent electromagnetic wave absorption properties. The maximum reflection loss was up to -50.8 dB at 14.5 GHz and the absorption bandwidths with the reflection loss exceeding -10 dB were 4.2 GHz with a thickness of only 1.5 mm. Furthermore, our development strategies confirmed that the surface modification of graphene with branching-like polypyrrole and CoFe₂O₄ nanoparticles could make the ternary composites have a promising future in electromagnetic wave absorption materials.