The Preparation of Flower Structure Composites Composed of Lamellar CuS and RGO and Its Electromagnetic‐Wave‐Absorption Performance

The harm of electromagnetic wave to human daily life has gradually received widespread attention, and CuS, with unique morphology and high specific surface area, and as a typical P‐type semiconductor material, has a large number of holes, which is conducive to electron transport, which have used as electromagnetic wave absorption (EMA) materials. EMA properties are affected by the morphology of materials, and therefore, flower‐shaped CuS/reduced graphene oxide (RGO) formed by self‐assembly of 2D lamellar structure CuS and RGO is prepared via a simple water bath–heating reaction. The content of RGO was adjusted to obtain the superior EMA properties. In the results, it is shown that the synthesized CuS/RGO with RGO of 10 mg has an excellent EMA capacity of strong reflection loss (RL min = −46.8 dB) and broad effective absorption bandwidth (EAB = 4.9 GHz), at the thickness of 2.04 mm and the frequency of 12.1 GHz. The prepared flower‐shaped CuS/RGO composites has a strong interface polarization because of its 2D/2D heterostructure, and the 2D CuS was compounded with 2D RGO to form 3D conductive networks improving conductive loss capacity. In this article, the study on the influence of the morphology of transition‐metal sulfides–based composites on EMA field is enriched.