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BiFeO3-graphene oxide (BFO-GO) nanocomposites were synthesized through ultra-sonication under mild heating, and their electromagnetic interference (EMI) shielding performance was investigated. The nanocomposites preserve the crystalline phase with R3c symmetry as analyzed by Rietveld refinement of x-ray diffraction data. The Raman spectroscopy and x-ray photoelectron spectroscopy studies confirm the formation of structured GO in nanocomposites samples. Magnetic hysteresis curves indicate unsaturated magnetic behavior. The interfacial polarization is dominating in BFO-GO composites as estimated from frequency dependent complex parameters determined in line with the Nicolson-Ross-Weir algorithm. The BFO-GO nanocomposites showed EMI shielding effectiveness of 18 dB (93% attenuation) over the measured frequency range. The oxide composite is a suitable EMI shielding material for techno-commercial applications. [ABSTRACT FROM AUTHOR]

This paper deals with the preparation of graphene oxide–ferrofluid–cement nanocomposites to evaluate the electromagnetic interference (EMI) shielding effectiveness (SE) in the 8.2–12.4 GHz frequency range. It has been observed that incorporation of graphene oxide (30 wt%) along with an appropriate amount of ferrofluid in the cement matrix leads to a shielding effectiveness of 46 dB (>99% attenuation).The presence of graphene oxide and ferrofluid in the cement leads to strong polarizations and magnetic losses that consequently result in higher shielding effectiveness compared to pristine cement. The resulting nanocomposites have shown Shore hardness of 54 and dc conductivity of 10.40 S cm − 1. SEM reveals the homogeneous dispersion of graphene oxide and ferrofluid in the cement matrix. [ABSTRACT FROM AUTHOR]

The present paper reports the synthesis and characterization of poly (o-toluidine) (POT) embedded with barium ferrite and reduced graphene oxide. Barium ferrite nanoparticles (BF) were prepared by citrate precursor technique. Synthesis of reduced graphene oxide (RGO) from graphite powder was carried out by improved Hummer's method. Composite of poly (o-toluidine) with barium ferrite and reduced graphene oxide (POT/BF/RGO) was synthesized by in-situ polymerization method. The formulation shows total shielding effectiveness of 12.07 dB in the X-band (8.4-12.4 GHz) frequency range. Permeability and dielectric parameters have been calculated from the measured scattering parameters (S11, S22, S12, S21) using the Nicolson-Ross-Weir algorithm. The synthesized formulations were characterized using x-ray diffraction (XRD), scanning electron microscope (SEM), Transmission electron microscopy TEM, Ultraviolet-visible spectroscopy (UV-Vis) and vibrating sample magnetometer (VSM). [ABSTRACT FROM AUTHOR]