Microwave absorption performance enhancement of NiFe2O4/GNs composite with hollow hexagonal-like structure

It is a major aspect in the field of absorbing materials to obtain composite absorbing materials with prominent absorbing properties through shape design. In this paper, a hollow hexagonal NiFe2O4/GNs composite absorbing material was prepared by a simple hydrothermal method. The test results show that the minimum reflection loss of the composite can reach −57.4 dB at the low frequency of 6.08 GHz, and the corresponding thickness is 2.9 mm; When the hydrothermal reaction temperature is 200 ℃, the maximum effective absorption bandwidth is 3.12 GHz, and the thickness is as thin as 1.1 mm. With the increase of hydrothermal reaction temperature, the morphology of nickel ferrite gradually changed from round rod to hollow hexagonal prism, and the microwave absorption characteristics of the composite also varied and adjusted. This paper provides the preparation process of NiFe2O4/GNs composites with controllable morphology, and possesses a certain reference for the study of the interaction mechanism of ferrite and graphite nanosheets composite microwave absorbing materials. In addition, the sample has excellent microwave absorption performance in the low-frequency band, while the current wave absorption band of ferrite composites is mainly in the high-frequency band, so the sample has great research and development potential in the field of low-frequency microwave absorbing materials.