Microwave Absorption Behavior of Core−Shell Structured Poly (3,4-Ethylenedioxy Thiophene)−Barium Ferrite Nanocomposites

Abstract

The present paper reports the complex permittivity, permeability, and microwave absorption properties of core shell type poly (3,4-ethylenedioxy thiophene) (PEDOT) nanocomposite with barium ferrite, synthesized by in situ emulsion polymerization, in the 12.4-18 GHz frequency range. High-resolution transmission electron microscopy (HRTEM) studies reveal the formation of core-shell type morphology with ferrite particles (60-80 nm) as the center while the polymer (PEDOT) formulates the outer shell of the composite. The presence of barium ferrite nanoparticles in the polymer matrix includes the magnetic losses, which mainly arise from the magnetic hysteresis, domain-wall displacement, and eddy current loss. The higher dielectric (epsilon'' = 23.5) and magnetic loss (micro'' = 0.22) contributes to the microwave absorption value of 22.5 dB (>99% attenuation) and are found to increase with the amount of ferrite constituents. The polymer was further characterized through Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD).

Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding

“…It is clear that BaFe 12 O 19 nanoparticles are assembled on the surface of two dimensional RGO sheets, as shown in Fig. 2(b 24 This is consistent with the results calculated from the XRD analysis, shown in Fig. 4(a).…”

“…36 A slight shift in the main peaks of RGO observed in the FTIR spectrum of BaFe 12 O 19 @RGO could be due to some interaction of ferrite particles with the graphene sheets of RGO. 24 Thermogravimetric analysis was performed on GO, RGO, BaFe 12 Fig. 4(b)).…”

Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

“…The lines for both real and imaginary part of permittivity remain almost constant throughout the whole frequency range in Xband region. The extent of polarization happening in the material is related to the real part of permittivity ("%) and the imaginary part ("&) of permittivity is associated with the energy dissipated [42]. The different possible polarization mechanisms, which are helpful to describe the dielectric performance of the material, are ionic, electronic, orientational, and space charge polarization.…”

Synthesis of ferrofluid based nanoarchitectured polypyrrole composites and its application for electromagnetic shielding

“…Therefore, conjugated polymers combined with magnetic nanoparticles to form ferromagnetic nanocomposites provide an exciting system to investigate the possibility of exhibiting novel functionality to provide the better microwave absorption properties [19e21]. Recently, Dhawan et al have investigated by the microwave absorption properties of the g-Fe 2 O 3 incorporated polyaniline, PEDOT nanocomposites with different loading [22,23]. The properties of these polymer composites depend on their micro/nanostructures and morphologies which is controlled by the synthesis method.…”