Preparation and electromagnetic properties of graphene-supported Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 nanocomposite

摘要

The graphene supported Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 nanocomposite was prepared by a deoxidation technique. The structure, morphology and electromagnetic properties of the composites were characterized by various instruments. The Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 powders could be distributed on the graphene sheets (GNS). The as-prepared Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 nanocomposite exhibits a saturated magnetization of 50.42 emu/g. The electromagnetic parameters of Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 anocomposite were investigated in the 2-18 GHz range. The composite Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 exhibits better microwave absorbing properties than Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 The minimum loss value of Ni_(0.8)Zn_(0.2)Ce_(0.06)Fe_(1.94)O4 nanocomposite is —37.4 dB at 12.3 GHz and a broad peak with a bandwidth lower than —10 dB is at 10.7-15.2 GHz. 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.