In this work, silver–copper oxide (Ag–CuO) nanoparticles were incorporated into polyethylene oxide/carboxymethyl cellulose (PEO/CMC) blend to tailor its structural, dielectric, and electrical properties. A constant content of Ag nanoparticles of 0.3
Flexible PVDF-based electrolyte films incorporating AgNO3/LiCl nanofillers were prepared via a solution casting process. Hybrid salt additives were introduced at varying concentrations (0.5, 1.5, and 3.0 wt.%) into the PVDF matrix to assess their impact on the structural, optical, and electrical properties of the composite films. XRD analysis confirmed a decrease in crystallinity from 36.32% in pure PVDF to 17.95% at 3.0 wt.% loading, indicating increased amorphous content conducive to ionic mobility. FTIR spectroscopy revealed strong interactions between nanofillers and the polymer, with shifts and broadening of characteristic bands. UV-Vis spectroscopy showed enhanced absorption in the UV-Visible range and a notable decrease in optical bandgaps, from 3.51 eV (direct) in pure PVDF to 2.53 eV in the 3.0 wt.% sample. AC conductivity measurements revealed a significant increase in conductivity with filler content, particularly at high frequencies, attributed to enhanced charge transport via hopping mechanisms. Dielectric analysis showed a marked increase in dielectric constant (up to 7.4 x 104 at 1.5 wt.%) and dielectric loss at low frequencies. Electric modulus and Cole-Cole plots confirmed improved relaxation behavior and reduced bulk resistance. These results demonstrate that PVDF- AgNO3/LiCl nanocomposites are promising candidates for high-performance solid polymer electrolytes in energy storage and optoelectronic applications.
Poly(vinyl alcohol) (PVA)/polyethylene oxide (PEO) blend electrolytes incorporating silver nanoparticles (Ag NPs) were fabricated via a conventional solution-casting technique and systematically investigated for their structural, optical, electrical, and dielectric properties. Transmission electron microscopy confirmed that the synthesized Ag nanoparticles exhibit a nearly spherical morphology with a mean diameter of 29.87 nm. X-ray diffraction analysis revealed a progressive reduction in the crystallinity of PVA/PEO blend matrix with increasing Ag nanoparticles content, indicating enhanced amorphous character and strong polymer–nanoparticle interactions. Fourier-transform infrared spectroscopy confirmed interactions between Ag nanoparticles and the hydroxyl and ether functional groups of the blend. UV–visible optical studies demonstrated a concentration-dependent red shift in the absorption edge and a significant reduction in both indirect and direct optical band gap energies, decreasing from 4.99 and 5.30 eV for the pristine PVA/PEO blend to 4.15 and 4.56 eV, respectively, at higher Ag loadings. Electrical and impedance spectroscopy revealed a pronounced enhancement in ionic conductivity upon Ag incorporation, attributed to reduced bulk resistance, increased segmental mobility, and the formation of conductive pathways within the nanocomposite matrix. Furthermore, dielectric analysis showed high dielectric constants at low frequencies governed by Maxwell–Wagner–Sillars interfacial polarization. The combined improvements in structural, optical, electrical and dielectric properties highlight the potential of PVA–PEO/Ag nanocomposite electrolytes for energy storage applications, particularly high-performance dielectric capacitors and multifunctional polymer systems.
In this study, the polymer nanocomposites (PNC) films, which consist of chitosan (CS), poly (vinyl) pyrrolidone (PVP), and iron vanadate (FeVO4) nanoparticles (FVO NPs) were prepared utilizing the solution casting method. Numerous investigations, including structural, vibrational, electrical, dielectric, and optical tests, demonstrate promising properties of the generated polymer nanocomposites. Up to a 1.5 weight% FVO concentration, the sample's amorphous character improved, according to the Xray diffraction (XRD) examination. The existence of intermolecular interactions in the nanocomposite was confirmed by Fourier transform infrared spectroscopy (FTIR) and UV-Visible spectroscopy. Experimental results showed that the nanocomposites' optical bandgap decreased as the FVO concentration grew. The investigative values of the ε', ε'', and σac show notable differences in frequency. It is found that the values of the ε' and ε'' rise with frequency. It is shown that when the frequency increases, so does the σac. The σac value increased with frequency, reaching 4.14 × 10- 6 S·cm- 1 at 104 Hz from 5.42 × 10- 10 S·cm- 1 at 100 Hz. An increase in σac values is observed when the loading of FVO NPs is increased. Dielectric analyses showed that the CS/PVP/1.2%FVO nanocomposite sample had the best boost. Additionally, the energy density rose from 4.2 × 10- 7 J/m3 for CS/PVP to 1.35 × 10- 6 J/m3 for CS/PVP/1.2%FVO. The results show that the CS/PVP/FVO films can be used in energy storage applications because of their dielectric properties, which are successfully improved by increasing the FVO concentration.
Chitosan/polyvinylpyrrolidone (CH/PVP)-based polymer nanocomposites have emerged as promising materials for advanced electronic and biomedical applications due to their biocompatibility, processability, and tunable physicochemical properties. In this work, novel CH/PVP-Fe2O3/I2O5 hybrid nanocomposites were successfully synthesized via a solution-casting approach with different nanofiller concentrations (0.5-1.5 wt%). Structural, optical, magnetic, electrical, and dielectric properties of the prepared films were systematically investigated. XRD analysis revealed a substantial reduction in crystallinity with increasing nanofiller content, indicating enhanced amorphous character favorable for ionic transport. UV-Vis measurements showed a progressive red shift in the absorption edge and a significant reduction in both direct and indirect band gaps, attributed to charge-carrier generation and electronic structure modification induced by Fe2O3/I2O5. AC conductivity measurements revealed nearly two orders of magnitude enhancement in sigma dc (from 4.20 & times; 10-11 to 2.46 & times; 10-9 S cm- 1), governed by the correlated barrier hopping mechanism. Dielectric analysis showed improved permittivity and enhanced interfacial polarization, particularly at low frequencies. The combined results confirm that incorporating Fe2O3/I2O5 nanorods effectively tailors the structural disorder, charge transport, dielectric response, and optical transparency of the CH/PVP matrix. These findings highlight the potential of CH/ PVP-Fe2O3/I2O5 nanocomposites for flexible optoelectronic devices, energy-storage systems, and electromagnetic applications.
