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<p>Although Poly (vinylidene fluoride) (PVDF) and Poly (ethylene oxide) (PEO) are promising polymers for flexible electronics, their practical application is often restricted by low dielectric permittivity and charge storage capacity. To address this, this work reports the fabrication of novel hybrid nanocomposite films based on a PEO-PVDF blend integrated with dual nanofillers: Vanadium Pentoxide (V<sub>2</sub>O<sub>5</sub>) and Copper Oxide (CuO), using a solution casting technique. The structural analysis (XRD and SEM) confirmed the successful incorporation of discrete metal oxide phases within the semi-crystalline polymer matrix. Optical analysis revealed that the nanocomposites maintain a wide fundamental band gap of ~ 4.9 eV, ensuring high electrical breakdown strength despite heavy doping. Dielectric spectroscopy demonstrated a remarkable enhancement in performance; the relative permittivity (<i>ε</i>′) increased significantly from 2.6 (for the pristine blend) to 36 for the Cu(3)-doped film, representing a 14-fold enhancement. This improvement is attributed to the synergistic Interfacial Polarization (Maxwell–Wagner-Sillars effect) and the formation of semiconductive networks that facilitate Correlated Barrier Hopping (CBH) conduction. The AC conductivity also rose to 2.6 × 10<sup>–6</sup> S/cm while maintaining structural stability. These findings provide a fundamental understanding of the dielectric behavior in Cu(3)-V-PEO-PVDF nanocomposite, establishing a baseline for future architectural optimizations, such as core–shell structures, required to minimize dielectric loss for potential flexible electronic applications.</p>

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Tailoring the structural, optical, and dielectric properties of V2O5 and CuO integrated poly (ethylene oxide)-poly (vinylidene fluoride) nanocomposite films

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Khadijah H. Alharbi,
  • Walaa Alharbi,
  • Mashael M. Alharbi,
  • M. A. El-Morsy,
  • A. A. Menazea

摘要

Although Poly (vinylidene fluoride) (PVDF) and Poly (ethylene oxide) (PEO) are promising polymers for flexible electronics, their practical application is often restricted by low dielectric permittivity and charge storage capacity. To address this, this work reports the fabrication of novel hybrid nanocomposite films based on a PEO-PVDF blend integrated with dual nanofillers: Vanadium Pentoxide (V2O5) and Copper Oxide (CuO), using a solution casting technique. The structural analysis (XRD and SEM) confirmed the successful incorporation of discrete metal oxide phases within the semi-crystalline polymer matrix. Optical analysis revealed that the nanocomposites maintain a wide fundamental band gap of ~ 4.9 eV, ensuring high electrical breakdown strength despite heavy doping. Dielectric spectroscopy demonstrated a remarkable enhancement in performance; the relative permittivity (ε′) increased significantly from 2.6 (for the pristine blend) to 36 for the Cu(3)-doped film, representing a 14-fold enhancement. This improvement is attributed to the synergistic Interfacial Polarization (Maxwell–Wagner-Sillars effect) and the formation of semiconductive networks that facilitate Correlated Barrier Hopping (CBH) conduction. The AC conductivity also rose to 2.6 × 10–6 S/cm while maintaining structural stability. These findings provide a fundamental understanding of the dielectric behavior in Cu(3)-V-PEO-PVDF nanocomposite, establishing a baseline for future architectural optimizations, such as core–shell structures, required to minimize dielectric loss for potential flexible electronic applications.