MoSe₂ nanosheets implanting on 3D hollow carbon sphere for high-efficiency electromagnetic wave absorption

Carbon-based electromagnetic wave absorption (EMA) materials are extensively studied due to their unique advantages. Nevertheless, impedance matching issues was still constraining their further research. Consequently, we successfully synthesized MoSe₂ nanosheets implanting on 3D hollow carbon sphere (HCS@MoSe₂) composites with core–shell structure. The complex core–shell structure high-entropy composites provided multiple dissipation mechanisms for efficient dissipation of incident electromagnetic wave energy. The implanting MoSe₂ nanosheets optimized the dielectric constant of the composites, thus ensuring optimal impedance matching. The HCS@MoSe₂-1 composites exhibit excellent EMA properties and a significant minimum reflection loss (RL_min) of −56.19 dB. And HCS@MoSe₂-1 had an ultra-wide effective absorption bandwidth (EAB) of 7.43 GHz. The significant EMA capability attributed to the synergistic effects of conductive loss, polarization loss, and optimized impedance matching. This work paved a new path for synthesizing transition metal selenide-modified carbon-based composite materials, offering great potential as high-performance materials for EMA applications.