Electromagnetic collaborative optimization of DyFe-MOFs derivatives for ultra-thin electromagnetic wave absorption
Xiaoli Wang, Juhua Luo, S J Mao, Daqing Cheng, Xing Liu, Yu Xie, Lichun Cheng
Abstract
Achieving high-performance electromagnetic wave absorption (EMWA) capacity at thinner thickness remains a critical yet challenging objective. In this study, Dy<sub>2</sub>O<sub>3</sub>/Fe<sub>3</sub>C/N-doped carbon (DFC) composites were synthesized via a solvothermal process followed by high-temperature carbonization, using metal-organic frameworks (MOFs) as precursors. By systematically adjusting the molar ratio of Dy<sup>3+</sup>/Fe<sup>3+</sup>, the dielectric and magnetic properties of the materials were synergistically optimized. The EMWA performance exhibited a non-monotonic dependence on Dy³⁺ content, firstly improving before declining at higher concentrations. At an optimal Dy<sup>3+</sup>/Fe<sup>3+</sup> 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 provided a novel strategy for designing next generation EMWA materials with ultra-thin profiles and wideband absorption capabilities.