Wave-transparent LAS enabling superior bandwidth electromagnetic wave absorption of a 2D pitaya carbon slice

Abstract

2D pitaya slice nano-LAS/carbon sheets prepared by ammonium nitrate-assisted self-polymerization and in situ blown strategy achieved superior EMW absorbing performance with 8.21 GHz bandwidth.

Magnetically driven hierarchically ordered carbonyl iron@SiO2/Ni@Ag/silicone rubber composite film for enhanced electromagnetic interference shielding with ultralow reflection

“…The real part ( ε ′, μ ′) of complex permittivity and permeability represents the storage capacity of EM energy, and the imaginary part ( ε ′′, μ ′′) of them stands for the capability to dissipate EM energy. 45 After being aligned, the ε ′ and ε ′′ values of the CS samples displayed in Fig. 3a1–a2 were significantly higher than those of the unaligned ones (Fig.…”

“…This could be attributed to the parallel alignment of the easy-magnetization planes of the flake-shaped EM microparticles, leading to an increase in their permeability. 46 Based on the measured EM parameters of the samples, the following equations were used to determine their reflection loss (RL) values: 45 where the inherent impedance of open space and the input are marked as Z 0 and Z in , respectively. In addition, f indicates the frequency, c denotes the light speed, and d represents the thickness.…”

Surface engineering of nanoflower-like MoS2 decorated porous Si3N4 ceramics for electromagnetic wave absorption

“…The evaluation of the EMW absorption performance of materials requires considering the impedance matching ratio Z and the attenuation constant α . Z represents the ability of EMW to enter the interior of a material without being reflected, and it can be expressed using eqn (6): 60 …”

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

“…Furthermore, the polar functional groups (-O, -OH), nitrogen heteroatom (pyrrolic/pyridinic/graphitic N), and defects induced multiple dipole polarization. 7,41 It is noteworthy that the linear tail of the Cole-Cole curve conrmed the existence of conductive loss, which was attributed to the symmetrical 3D conductive network. In addition, the contribution of magnetic loss to the EMW absorption was mainly from natural resonance, eddy current loss, and exchange resonance.…”

“…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.…”