Regulated electron migration in sandwich-like m-Ti₃C₂/Fe₃O₄ composites derived from electrostatic assembly boosted electromagnetic wave absorption

Abstract

Magnetic MXene-based composites have been extensively developed for highly effective electromagnetic (EM) wave absorption. However, the previously reported works neglect the influence of regulating the primary dissipation sources, electron migration,...

4D printing MOF-derived/multi-fluorination nanocomposites for ultra-efficient electromagnetic wave absorption and robust environment adaptivity

“…(5) The special micro-nanostructures combined the advantages of the porous structure and the magnetic–dielectric coupling component could optimize the impedance matching. 8 In summary, a unique multiphase heterogeneous structure could endow the 12 CoM@CoNiC–F nanocomposites extraordinary EMW absorption performance with low filling load by multiple attenuation mechanisms.…”

“…Third, MOF-derived carbon matrix with controllable heteroatom-doping were uniformly dispersed in the periodic framework and dielectric substrates, which is beneficial for multiple dipole polarization. 7 Thus, substantial MOF-derived nanocomposites were fabricated as MAMs, such as Co@C/MXene, 8 1D CoCNTs–MXene@CF, 9 3D core–shell Fe 3 O 4 @SiO 2 @MoS 2 composites, 10 and Fe 3 O 4 @Zn–N–carbon. 11 Additionally, bimetallic-MOFs exhibit abundant heterogeneous interfaces, tailored morphology, and magnetic behavior, which is represented by the Co x Ni y @C nanosheets, 12 FeNi@NC/NCR/rGO, 13 CoO/MCo 2 O 4 /Ti 3 C 2 T x , 14 and so on.…”

Optimizing dielectric polarization for electromagnetic wave attenuation via an enhanced Maxwell–Wagner–Sillars effect in hollow carbon microspheres

“…Among these, the hollow structure, with the advantages of large internal voids and lightweight, has attracted widespread attention. 19,20 According to the Maxwell-Garnett theory, the hierarchical porous structure can adjust the effective permittivity of composites, and thus the interior cavities can regulate the impedance-matching characteristic and provide multiple reection and scattering sites to extend the transmission path of EMWs to attenuate the incident electromagnetic energy. 20 Additionally, hollow structures with internal voids are more favorable for the construction of an electron migration network than bulk/solid materials to increase the conduction loss.…”