Synthesis, thermal and dielectric investigations of PVDF/PVP/Co0.6Zn0.4Fe2O4 polymer nanocomposite films

• Published in: Journal of materials science. Materials in electronics 2021-12, Vol.32 (23), p.27339-27347
• Main Authors: Taha, T. A., El-Nasser, Karam S.
• Format: Article
• Language: English
• Subjects: Absorption spectra; Beta phase; Carbonyl groups; Carbonyls; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal structure; Dielectric properties; Dielectric strength; Fourier transforms; Gamma phase; Infrared analysis; Infrared spectroscopy; Materials Science; Nanocomposites; Optical and Electronic Materials; Permittivity; Polymer films; Polymers; Polyvinylidene fluorides; Polyvinylpyrrolidone; Scanning electron microscopy; Spectrum analysis; Thermal decomposition; Thermogravimetric analysis; X-ray diffraction
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07104-w

This study aims to prepare and examine the structure, thermal and dielectric properties of Polyvinylidene fluoride (PVDF)/Polyvinylpyrrolidone (PVP)/Co 0.6 Zn 0.4 Fe 2 O 4 nanocomposite films. The data were collected via X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and dielectric measurements. The XRD spectrum of the Co 0.6 Zn 0.4 Fe 2 O 4 ferrite sample showed a spinel crystal structure with an average size 15 nm. In the X-ray diffraction spectra of the PVDF-Co 0.6 Zn 0.4 Fe 2 O 4 polymer nanocomposites, β-phase diffraction peak appeared at 2 θ =  0.2°. SEM images of all the nanocomposite films exhibited a homogeneous distribution of nanostructured Co 0.6 Zn 0.4 Fe 2 O 4 . FTIR spectra depicted the absorption bands for α, β and γ-phase of PVDF as well as the carbonyl group of PVP. From TGA analysis, the activation energy for thermal decomposition decreased from 285.73 to 248.97 kJ/mol.K. Besides, there is a decrease in both ΔH and ΔG values with an increase in the Co 0.6 Zn 0.4 Fe 2 O 4 concentration. The static dielectric constant ( ε s ), the high-frequency dielectric constant ( ε ∞ ) and the dielectric strength (Δε) for these nanocomposites were lower than the pure PVDF/PVP film. The DC conductivity values were 2.27 × 10 −14 , 1.63 × 10 −8 , 2.04 × 10 −10 and 1.61 × 10 −8 S/cm for 0.0, 1.0, 3.0 and 5.0 wt% of Co 0.6 Zn 0.4 Fe 2 O 4 .