Orbital hybridization has proven to be an effective strategy for tailoring electromagnetic wave absorption (EMWA) performance. However, achieving precise control over such hybridization remains challenging. In this study, spherical NiTe@NC (NTC) composites were synthesized through a combined hydrothermal method, polymerization reaction, and high-temperature tellurization. By varying the mass ratio of nickel-based metal-organic framework (Ni-MOF) to polydopamine (PDA), the EMWA performance of the composite was adjusted. At an optimal Ni-MOF to PDA mass ratio of 1:4 and a filler loading of 30 wt%, the composite exhibits a minimum reflection loss (RL_min) value of -30.66 dB at a thickness of 1.73 mm and achieved an effective absorption bandwidth (EAB) value of 6.80 GHz at 1.96 mm. The Density functional theory (DFT) results confirm strong d-p orbital hybridization between the Ni 3d, Te 5p, and N 2p orbitals. The excellent EMWA capability stems from the synergistic combination of conductive loss, polarization loss, and magnetic loss. Furthermore, by designing a gradient multilayer periodic array based on NTC, the EAB could be broadened to 12.72 GHz (5.28-18 GHz). Radar cross-section (RCS) simulation results show that the RCS of the NTC-2 composite is reduced by 19.06 dB·m² compared with that of a perfect electric conductor. Overall, this work provides insights into the development of hybridization induced broadband EMWA materials.

Achieving high-performance electromagnetic wave absorption (EMWA) capacity at thinner thicknesses remains a critical yet challenging objective. In this study, Dy₂O₃/Fe₃C/N-doped carbon (DFC) composites were synthesized via a solvothermal process followed by high-temperature carbonization, with metal-organic frameworks (MOFs) used as precursors. By systematically adjusting the molar ratio of Dy³⁺/Fe³⁺, the dielectric and magnetic properties of the materials were synergistically optimized. The EMWA performance exhibited a nonmonotonic dependence on the Dy³⁺ content, first increasing before decreasing at higher concentrations. At an optimal Dy³⁺/Fe³⁺ molar ratio of 1.2 : 0.8, the DFC composites demonstrated a remarkable minimum reflection loss value of −56.08 dB at a mere 1.76 mm thickness, alongside an effective absorption bandwidth value of 5.12 GHz (12.56–17.68 GHz). The exceptional EMWA performance stems from optimized impedance matching, multiple scattering and reflections, dielectric loss, and magnetic loss. Furthermore, radar cross-section simulations validated the material’s practical applicability. Therefore, this work provides a novel strategy for designing next-generation EMWA materials with ultra-thin profiles and wideband absorption capabilities.

Conductive metal-organic frameworks (MOFs) have emerged as promising electromagnetic wave absorption (EMWA) properties materials due to their tunable dielectric properties and straightforward synthesis. Nevertheless, achieving broad effective absorption bandwidth (EAB) at ultrathin thickness remains a significant challenge. Herein, a series of rod-haped bimetallic CuM-HHTP (M = Mn, Co, Ni, and Zn) were synthesized via a hydrothermal approach. Remarkably, all fabricated samples demonstrated wide EAB values at ultrathin thickness. The EAB performance was found to correlate positively with the electron transfer capability of metal ions, following the order: CuNi > CuCo > CuZn > CuMn. This trend can be attributed to subtle variations in charge carrier concentrations and dipole moment modifications induced by the coordination of heterogeneous metal ions to hydroxyl groups, which arise from the coordination tendency and bond strength of the heterobimetallic binding to the ligands. The EAB value of CuNi-HHTP reached up to 7.12 GHz (10.88–18.00 GHz) at a matching thickness of only 1.78 mm. The outstanding EMWA performance was originated from optimized impedance matching, synergistic dipole and defect polarization, interface polarization, and conductive loss. Additionally, radar cross-section simulation confirmed the material's practical applicability in EMWA. This study presents a novel strategy for designing high-performance bimetallic conductive MOFs absorbers with tailored electromagnetic properties.

Rational design of the components and microstructure is regarded as an efficacious strategy for the high-performance electromagnetic wave absorbing (EMWA) materials. Herein, the CoTe₂@MoS₂ nanocomposites with CoTe₂ nanorods and MoS₂ nanosheets were synthesized via a hydrothermal method. The microstructure and composition of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The CoTe₂@MoS₂ composite was composed of stacked CoTe₂ as the core and intertwined MoS₂ nanosheets as the shell. The electromagnetic parameters of the CoTe₂@MoS₂ composites were investigated by vector network analyzer (VNA). The EMWA property of the composite showed a trend of first increasing and then decreasing with the increasing content of MoS₂. When the mass ratio of MoS₂ and CoTe₂ was 1:1, the CoTe₂@MoS₂ composite exhibited the minimum reflection loss value of −68.10 dB at 4.71 GHz, and the effective absorption bandwidth value might reach 4.64 GHz (13.08–17.72 GHz) at a matching thickness of 1.60 mm with filler loading of 50 wt.%. The extraordinary EMWA property was attributed to the optimized impedance matching, multiple scattering and reflections, dipole polarization, conductive loss, and interfacial polarization. Therefore, the present approach to the design of microstructure and interface engineering offers a crucial way to construct high-performance EMW absorbers.

High stability and efficient charge separation are two critical factors to construct high-performance photocatalysts. Here, an efficient strategy was provided to fabricate the nanocomposite of graphitic carbon nitride/ferroferric oxide/reduced graphene oxide (g-C₃N₄/Fe₃O₄/RGO). The degradation of rhodamine B (RhB) by g-C₃N₄/Fe₃O₄/RGO nanocomposite followed the pseudo-first-order kinetics. The g-C₃N₄/Fe₃O₄/RGO nanocomposite exhibited excellent stability and magnetically separable performance. It was ascertained that the quantum efficiency and separation efficiency of photoexcited charge carriers of g-C₃N₄/Fe₃O₄/RGO nanocomposite were obviously improved. Particularly, the g-C₃N₄/Fe₃O₄/RGO nanocomposite with 3 wt.% RGO presented 100% degradation efficiency under visible light irradiation for 75 min. The remarkable photocatalytic degradation activity is attributed to the synergistic interactions among g-C₃N₄, Fe₃O₄, and RGO, along with the efficient interfacial charge separation.