Self‐Assembled MoS₂ Cladding for Corrosion Resistant and Frequency‐Modulated Electromagnetic Wave Absorption Materials from X‐Band to Ku‐Band

Abstract

Reasonable composition design and controllable structure are effective strategies for harmonic electromagnetic wave (EMW) adsorption of multi‐component composites. On this basis, the hybrid MoS2/CoS2/VN multilayer structure with the triple heterogeneous interface is prepared by simple stirring hydrothermal, which can satisfy the synergistic interaction between different components and obtain excellent EMW absorption performance. Due to the presence of multiple heterogeneous interfaces, MoS2/CoS2/VN composites will produce strong interfacial polarization, while the defects in the sample will become the center of polarization, resulting in dipole polarization. Due to the excellent structural design of MoS2/CoS2/VN composite material, MoS2/CoS2/VN composite material not only has good conductive loss and polarization loss, but also can maintain excellent stability in simulated seawater, and enhance corrosion resistance. The MoS2/CoS2/VN composite with dual functions of corrosion resistant and microwave absorption achieves a minimum reflection loss (RL) of −50.48 dB and an effective absorption bandwidth of up to 5.76 GHz, covering both the X‐band and Ku‐band. Finally, this study provides a strong reference for the development of EMW absorption materials based on transition metal nitrides.

Construction of Hierarchical Yolk–Shell Co/N-Dope C@void@C@MoS2 Composites with Multiple Heterogeneous Interfaces toward Broadband Electromagnetic Wave Absorption

“…Furthermore, another crucial factor in evaluating the loss capacity of EMWs is their attenuation ability. The attenuation constant (α) is commonly used to quantify the ability of an absorber to attenuate EMWs and can be expressed as follows α = 2 π f c × ( μ ″ ε ″ − μ ′ ε ′ ) + false( μ ″ ε ″ − μ ′ ε ′ false) 2 + false( μ ″ ε ′ − μ ′ ε ″ false) 2 …”

Heterostructured BN@Co‐C@C Endowing Polyester Composites Excellent Thermal Conductivity and Microwave Absorption at C Band

“…The increase of 𝛼 values indicates that the attenuation and dissipation capacities of Co-C for electromagnetic waves are en-hanced, allowing Co-C efficiently to convert more incident electromagnetic waves into thermal energy. [61][62][63] However, when the pyrolysis temperature reaches 900 °C, the 𝛼 value of Co-C further increases but the microwave absorption performance decreases. It is attributed to the poor impedance matching between Co-C and free space, making it difficult for electromagnetic waves to enter the interior of Co-C for attenuation and dissipation.…”

Morphology evolution of core–shell carbon@mesoporous carbon microspheres with excellent microwave absorption performance

“…7–10 To further boost the MA performance, researchers have investigated composite carbon materials with dielectric (MoS 2 , SnO 2 , and TiO 2 ) or magnetic (FeCo, Fe 3 O 4 , and CoFe 2 O 4 ) materials to optimize their electromagnetic parameters. 11–16 Although the dissipation capacity is improved compared with single carbon materials, their intrinsic light weight is greatly impaired due to the applied loading materials. In contrast, constructing double-carbon-component-based materials (C/C composites) can not only maintain the superior light weight of carbon but also introduce multiple interfaces to modify the complex permittivity, thus broadening the effective absorption bandwidth and strengthening the reflection loss (RL) intensity.…”