Nickel Sulfide/Graphene Composites for Electromagnetic Wave Absorption
Chuanhe Wang, Yani Zhang, Weiao Kong, Gen Li, Zhiqiang Xue, Shoubing Wang, Zhidong Liu, Huanian Zhang, Liping Guo, Min Zhang, Shugang Tan
Abstract
In this work, heterogeneous nickel sulfide/graphene composites were prepared by a simple solvent-thermal method. Composite graphene with excellent electrical conductivity and heterogeneous nickel sulfide can significantly improve its electromagnetic wave absorption performance. A systematic analysis of the effect of the mass ratio of graphene to heterogeneous nickel sulfide on the electromagnetic wave absorption performance. The introduction of graphene resulted in a heterogeneous interface, enhanced both interface and dipole polarizations, and consequently improved the electromagnetic wave absorption performance of the sample. When the mass ratio of heterogeneous nickel sulfide/graphene is 7:1, the minimum reflection loss value of the composite material is −41.8 dB at a thickness of 2.5 mm. In addition, With the thickness adjusted to 1.4 mm, the relative effective absorption bandwidth is 3.84 GHz. The resulting nickel sulfide/graphene heterogeneous composites are characterized by high absorption capacity, thin thickness, and light weight under the synergistic effect of multiple loss mechanisms, which is a promising electromagnetic wave absorbing material.