Preparation of lead hexaferrite filled PVA- PVP nanocomposite and a study of its structural features, optical and dielectric properties

Abstract

Polymer blend films based on PVA-PVP filled with PbFe12O19 hexa-ferrites nanoparticles were created by solution casting technique. XRD, HRTEM, FESEM, FTIR, UV-Vis spectroscopy and Broad-band dielectric spectroscopy were used to examine the properties of the prepared polymer composite films. X-ray diffraction pattern of the powder confirmed the formation of PbFe12O19 with hexagonal phase and that for the films confirmed the incorporation of the PbFe12O19 nanoparticles in the PVA-PVP blends. HRTEM confirms the formation of hexagonal nanoparticles with average size ranged from 7 nm to 21 nm. Field emission scanning electron microscopy (FESEM) studied the morphology of the nanocomposite films. There are noticeable variations in FT-IR spectra that confirm the incorporation of PbFe12O19, NPs in PVA-PVP blend. The absorbance was found to increase with red shift in the ultraviolet-visible region while the transmittance decreases with increasing PbFe12O19, nanoparticles. By incorporating, PbFe12O19 the direct optical gap and indirect optical gap gradually decreased from 5.20 eV to 4.44 eV and 4.97 eV to 4.34 eV, respectively while the Urbach energy increases from 0.274 eV to 0.678 eV. According to the Wemple-Didomenico single oscillator model, the optical dispersion parameters have been examined and are found to be strongly affected by PbFe12O19, loading. Additionally, the nanocomposite film containing 7.5% PbFe12O19, demonstrated outstanding optical shielding. The complex dielectric constant (ε*), complex electric modulus (M*) and electrical conductivity, of NCPs materials have been studied with the frequency changing from 0.1 Hz to 10 MHz. The real permittivity (ε^') of PVA-PVP blend polymer film increased while the real electric modulus (M’) is found to decrease by the incorporation of PbFe12O19, nanoparticles up to 2.5 wt. % and the imaginary component of permittivity follows the same pattern of ε^'. The examined nanocomposite films show promise for flexible optoelectronics, photosensors, optical shielding and nano-dielectric materials.

Novel cobalt lead ferrite (CPFO)/Ps nanocomposites with enhanced structure, optical and dielectric properties

“…The IR band appeared at 754 cm −1 and 684 cm −1 can be consigned to C-H bending in benzene ring. The lowest bands in the 500-400 cm −1 range were caused from the octahedral metal-oxygen bond's stretching vibrations [2]. These bands are slightly shift with increasing CPFO content in PS matrix.…”

“…Polymer nanocomposites were utilized in various applications as photovoltaic cells, optoelectronic devices, integrated capacitors, and sensors. The optical, mechanical, and electrical properties of such materials were modified to district materials property by filler incorporation in the host polymer matrices [1,2]. The advantages of polymeric materials to use them in optoelectronic devices arise from their increased stability and ability to create large-area devices with enhanced flexibility substrates.…”

Engineering the optical, and dielectric properties of (PVA: PVP)/BaSnO3 polymer nanocomposites as promising films for optoelectronics and energy storage applications

“…Assuming α and S are independent of thickness and since the scattering factor is wavelength independent, F(R) is proportional to α. Then Tauc's formula can be represented by the relation between (hνF[R]) 2 and hν, as elucidated in Figure 6B, and the band gap is estimated via extrapolating the linear portion to the x-axis. It has been found that the band gap of BaSnO 3 is about 3.2 eV which agrees with many previous works.…”

“…In recent years, the process of blending different polymers and fabrication of polymer nanocomposites has greatly found wide significance as the easiest option for tailoring materials and creating new systems for a wide range of daily applications 1,2 . Besides, it is a charming solution for tuning the physical and chemical properties of materials for specific end uses 3,4 .…”

Investigation of structure, thermal and dielectric study of Dy0.05Ba0.7Sr0.25TiO3/polystyrene nanocomposites

“…Most fillers used in fabricating polymer-based composites are ceramic particles with large permittivity, like barium titanate (BaTiO 3 ) and lead zirconia titanate (PbZrTiO 3 ). Further, conductive particles like carbon nanotubes, carbon black, and silver particles are used to improve the electrical properties of the nanocomposites [17][18][19][20][21][22]. The conductive particles/polymer-based composites usually have high relative permittivity due to the interfacial polarization through which the charges are built up at the interfaces between the insulated polymer matrix and conductive particles.…”