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<p>In this study, nanopowders with the composition Li₂Cu<sub>(1–(5/2)x)</sub>V<sub>x</sub>P₂O₇ (x = 0, 0.1, 0.2, 0.3) were successfully synthesized and incorporated into a poly(vinyl alcohol) (PVA) matrix to prepare nanocomposite films via the solution casting method, with 3 wt% of nanopowder dispersed in 0.5&#xa0;g of PVA. Differential Scanning Calorimetry (DSC) revealed a glass transition and enabled the determination of the degree of crystallinity. To determine each composition’s equivalent electrical circuit and examine its dielectric and electrical characteristics, broadband dielectric spectroscopy (BDS) experiments were conducted at room temperature. A circuit comprising a resistor in series with a resistor and a variable capacitor in parallel, which reflects both bulk conduction and interfacial polarization effects, adequately represented all films. The PVA/Li₂CuP₂O₇ film was chosen for in-depth analysis under varying temperature conditions because it had the highest electrical conductivity among the compositions. Even though vanadium doping somewhat decreased conductivity, it provides important insights into how dopants affect dielectric and interfacial characteristics, which can help guide the design of functional polymer nanocomposites. This study highlights the potential of Cu-based PVA nanocomposites for flexible dielectric and electronic devices, demonstrating improved electrical performance.</p>

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Effect of copper and vanadium oxide doping on the electrical and impedance behavior of PVA nanocomposite films

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Suad Ali Mohammed Alshikeewi,
  • Mahdi Hdidar,
  • Markram Megdiche,
  • Mourad Arous

摘要

In this study, nanopowders with the composition Li₂Cu(1–(5/2)x)VxP₂O₇ (x = 0, 0.1, 0.2, 0.3) were successfully synthesized and incorporated into a poly(vinyl alcohol) (PVA) matrix to prepare nanocomposite films via the solution casting method, with 3 wt% of nanopowder dispersed in 0.5 g of PVA. Differential Scanning Calorimetry (DSC) revealed a glass transition and enabled the determination of the degree of crystallinity. To determine each composition’s equivalent electrical circuit and examine its dielectric and electrical characteristics, broadband dielectric spectroscopy (BDS) experiments were conducted at room temperature. A circuit comprising a resistor in series with a resistor and a variable capacitor in parallel, which reflects both bulk conduction and interfacial polarization effects, adequately represented all films. The PVA/Li₂CuP₂O₇ film was chosen for in-depth analysis under varying temperature conditions because it had the highest electrical conductivity among the compositions. Even though vanadium doping somewhat decreased conductivity, it provides important insights into how dopants affect dielectric and interfacial characteristics, which can help guide the design of functional polymer nanocomposites. This study highlights the potential of Cu-based PVA nanocomposites for flexible dielectric and electronic devices, demonstrating improved electrical performance.