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<p>Chitosan (CS) is a promising biopolymer for energy-related applications; however, its dielectric properties remain inferior to those of advanced synthetic polymers. Therefore, this work aims to develop titanium dioxide (TiO₂)/erbium oxide (Er₂O₃)-reinforced chitosan nanocomposites with improved structural, optical, thermal, and dielectric characteristics for energy-storage and optoelectronic applications. The nanocomposite films were fabricated using a solution-casting technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), ultraviolet–visible (UV–Vis) spectroscopy, and dielectric measurements. XRD confirmed the successful incorporation of TiO₂ and Er₂O₃ into the CS matrix, with the crystallite size decreasing from 114 nm for pure CS to 17–44 nm for the nanocomposites. Optical analysis revealed a reduction in the direct band gap from 3.6 to 3.18 eV after nanoparticle incorporation. Dielectric studies demonstrated enhanced electrical performance, where the Er₂O₃(2)-TiO₂-CS sample exhibited a dielectric constant of approximately 400, while the Er₂O₃(3)-TiO₂-CS sample achieved the highest alternating-current (AC) conductivity of 1.6 × 10⁻⁶ S/cm with reduced dielectric loss. The improved behavior is attributed to interfacial polarization and charge transport at the polymer–nanoparticle interfaces. These results indicate that TiO₂/Er₂O₃-doped chitosan nanocomposites are promising candidates for flexible dielectric devices, room-temperature energy-storage systems, and optoelectronic applications.</p>

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Dielectric and energy-storage properties of TiO₂/Er₂O₃-reinforced chitosan nanocomposites for efficient electrical applications

  • 期刊论文

  • 发表日期：

    2026年7月12日

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  • Emad M. Masoud,
  • Amel Haouas,
  • Mashael M. Alharbi,
  • A. M. Alshehri,
  • A. A. Menazea

摘要

Chitosan (CS) is a promising biopolymer for energy-related applications; however, its dielectric properties remain inferior to those of advanced synthetic polymers. Therefore, this work aims to develop titanium dioxide (TiO₂)/erbium oxide (Er₂O₃)-reinforced chitosan nanocomposites with improved structural, optical, thermal, and dielectric characteristics for energy-storage and optoelectronic applications. The nanocomposite films were fabricated using a solution-casting technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), ultraviolet–visible (UV–Vis) spectroscopy, and dielectric measurements. XRD confirmed the successful incorporation of TiO₂ and Er₂O₃ into the CS matrix, with the crystallite size decreasing from 114 nm for pure CS to 17–44 nm for the nanocomposites. Optical analysis revealed a reduction in the direct band gap from 3.6 to 3.18 eV after nanoparticle incorporation. Dielectric studies demonstrated enhanced electrical performance, where the Er₂O₃(2)-TiO₂-CS sample exhibited a dielectric constant of approximately 400, while the Er₂O₃(3)-TiO₂-CS sample achieved the highest alternating-current (AC) conductivity of 1.6 × 10⁻⁶ S/cm with reduced dielectric loss. The improved behavior is attributed to interfacial polarization and charge transport at the polymer–nanoparticle interfaces. These results indicate that TiO₂/Er₂O₃-doped chitosan nanocomposites are promising candidates for flexible dielectric devices, room-temperature energy-storage systems, and optoelectronic applications.