Preparation and electromagnetic properties of graphene-supported Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄ nanocomposite

The graphene supported Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄ nanocomposite was prepared by a deoxidation technique. The structure, morphology and electromagnetic properties of the composites were characterized by various instruments. The Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄ powders could be distributed on the graphene sheets (GNS). The as-prepared Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄/GNS nanocomposite exhibits a saturated magnetization of 50.42emu/g. The electromagnetic parameters of Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄/GNS nanocomposite were investigated in the 2-18GHz range. The composite Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄/GNS exhibits better microwave absorbing properties than Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄. The minimum loss value of Ni_0.8Zn_0.2Ce_0.06Fe_1.94O₄/GNS nanocomposite is -37.4dB at 12.3GHz and a broad peak with a bandwidth lower than -10dB is at 10.7-15.2GHz. These results show that the introduction of GNS can increase the complex permittivities and has an important effect on the improvement of microwave absorption properties.