Enhanced electromagnetic absorption in NiO and BaTiO3 based polyvinylidenefluoride nanocomposites

The electromagnetic interference (EMI) shielding effectiveness and the intrinsic electrical properties of polymeric material filled with two different nanostructured fillers were investigated. The polymeric material being polyvinylidene fluoride (PVDF) and nickel oxide (NiO) and barium titanate (BaTiO3) were used as nanofillers. The PVDF/NiO/BaTiO3 nanocomposite films were prepared with the variable concentration of nanofillers using solvent casting method. The structural and morphological analysis of PVDF/NiO/BaTiO3 nanocomposite films was carried out using Fourier transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD) and Scanning electron microscopy (SEM). To understand the EMI shielding effectiveness, the absorption was studied in the Ku-band frequency range (8 Hz-12 Hz). The FTIR analysis shows the interaction between the phases at varying concentrations of nanofillers and the XRD analysis shows characteristic peaks of all the constituents of PVDF/NiO/BaTiO3 nanocomposites. SEM micrographs of PVDF/NiO/BaTiO3 nanocomposite film reveal homogeneous dispersion of both NiO and BatiO3 in the PVDF matrix. The impact of variable concentration of nanofillers on the overall shielding effectiveness (SE) was also investigated with the shielding effectiveness of −11.5 dB.