Nickel Sulfide/Graphene Composites for Electromagnetic Wave Absorption

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.