Enhanced microwave absorption material of ternary nanocomposites based on MnFe₂O₄@SiO₂, polyaniline and polyvinylidene fluoride

Abstract

Core–shell structural MnFe2O4@SiO2 nanocomposites have been fabricated. Our findings indicate that the ternary MnFe2O4@SiO2/PANI/PVDF composites filled with 20 wt% MnFe2O4@SiO2 and 20 wt% PANI show the most excellent wave absorption performance.

Polypropylene Nanocomposite Filled with Spinel Ferrite NiFe2O4 Nanoparticles and In-Situ Thermally-Reduced Graphene Oxide for Electromagnetic Interference Shielding Application

“…The 5 wt% RGO loaded nanocomposite sample has the highest attenuation constant α , leading to the most outstanding shielding nanocomposite material. The larger attenuation constant originates from more dielectric loss, which is helpful for EM wave absorbance performance [73]. Furthermore, the impedance matching behaviour also directly influences the EMI shielding effectiveness properties.…”

Co3O4/carbon composite nanofibrous membrane enabled high-efficiency electromagnetic wave absorption

“…By the study of composite absorbers principle in EM wave field, the R L was calculated using subsequent equations 2 , 6 , 32 – 34 and Matlab software. where Z in , Z 0 , c, f and d are the input impedance at the material and air interface, the source impedance, the EM wave velocity in free space, the frequency of the incident wave, the thickness of the absorbing material.…”

One‐Pot Hydrothermal Synthesis of Co3O4/MWCNTs/Graphene Composites with Enhanced Microwave Absorption in Low Frequency Band

“…Comparing to the Co 3 O 4 /Graphene, the ϵ′′ of the Co 3 O 4 /MWCNTs composite is much larger, especially in the low frequency domain, and there is an obvious peak value that can be seen around 0.45 GHz, which is ascribed to the wide distribution of MWCNTs adhered on the surface of Co 3 O 4 NPs, this will stimulate stronger dipole polarization and interfacial polarization between the Co 3 O 4 NPs and MWCNTs. The ϵ′′ of the Co 3 O 4 /MWCNTs decrease sharply and be close to the Co 3 O 4 NPs above 2.4 GHz for the orientation polarization of electric dipoles always lags behind the change of electric field . However, the Co 3 O 4 /Graphene/MWCNTs composite has a better performance due to the advantages of both the graphene and MWCNTs.…”

“…The ɛ'' of the Co 3 O 4 /MWCNTs decrease sharply and be close to the Co 3 O 4 NPs above 2.4 GHz for the orientation polarization of electric dipoles always lags behind the change of electric field. [39] However, the Co 3 O 4 /Graphene/MWCNTs composite has a better performance due to the advantages of both the graphene and MWCNTs. It shows that the ɛ'' of Co 3 O 4 /Graphene/MWCNTs also has an obvious peak and relatively larger values during the whole measurement range indicating that the more stable dissipation performance.…”