Microwave absorption properties of Ag naowires/carbon black composites

The composite that can absorb the high-performance electromagnetic(EM) wave is constructed into a sandwiched structure composed of carbon black(CB)/ethylene-vinyl acetate(EVA) and Ag naowires(Ag NWs). The Ag NWs sandwiched between two CB/EVA layers are used to improve the absorption properties of composite. The effects of EVA-to-CB weight ratio, concentration and diameter of Ag NWs with a thickness of 0.4 mm on microwave absorption are investigated.The results indicate that for an EVA-to-CB weight ratio of 1:3, Ag NW concentration of 1.0 mg/100 m L, and average diameter of 56 nm, the reflection loss(RL) of the composite is below-10 d B in a frequency range of 9.3 Ghz–18.0 GHz, with the minimum values of-40.0 d B and-25.6 d B at 13.5 GHz and 15.3 GHz, respectively. A finite element method(FEM)is used for calculating the RL of the composite. The calculated results are in agreement with the experimental data.