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<p>PVA/AuNPs nanocomposites were created to investigate the effects of nanoparticle concentration on the structural, optical, dielectric, and electrical properties of PVA. Gold nanoparticles (AuNPs) were synthesized using a citrate reduction method and incorporated into the PVA matrix through solution casting. Transmission Electron Microscopy (TEM) analysis revealed average particle sizes of approximately 9&#xa0;nm for the S1 sample (with 10 mL of precursor) and 10&#xa0;nm for the S5 sample (with 30 mL of precursor). X-ray Diffraction (XRD) confirmed the presence of crystalline PVA/AuNPs with a face-centered cubic (fcc) structure, showing crystallite sizes ranging from 9 to 10&#xa0;nm. Fourier Transform Infrared (FTIR) spectroscopy indicated a shift in the O-H band from 3325&#xa0;cm<sup>−1</sup> to 3307&#xa0;cm<sup>−1</sup>, signifying strong interactions between the surfaces of AuNPs and the hydroxyl groups in PVA. Ultraviolet-Visible (UV-Vis) spectroscopy confirmed the presence of Surface Plasmon Resonance (SPR) bands for AuNPs between 520 and 550&#xa0;nm, with a tunable SPR response ranging from 530.5 to 535&#xa0;nm in the PVA/AuNPs films. The optical band gaps measured between 2.01 and 2.11&#xa0;eV for the AuNPs and 5.09 to 5.45&#xa0;eV for the PVA/AuNPs nanocomposites. Dielectric analyses demonstrated significant frequency dependency consistent with interfacial polarization. The PVA/S3 sample exhibited the highest dielectric constant. Additionally, AC conductivity increased sharply above 10<sup>6</sup> Hz, following Jonscher’s power law, which suggests that conduction occurs via hopping or tunneling mechanisms. These findings emphasize the critical role of nanoparticle dispersion in optimizing the dielectric and electrical performance of the nanocomposites.</p>

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Interfacial Polarization and Plasmonic Effects in PVA/AuNPs Nanocomposites: Structural, Optical, and Dielectric Perspectives

  • 期刊论文

  • 发表日期：

    2026年5月3日

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  • Fatmah A. Al-Marhaby,
  • Roshdi Seoudi

摘要

PVA/AuNPs nanocomposites were created to investigate the effects of nanoparticle concentration on the structural, optical, dielectric, and electrical properties of PVA. Gold nanoparticles (AuNPs) were synthesized using a citrate reduction method and incorporated into the PVA matrix through solution casting. Transmission Electron Microscopy (TEM) analysis revealed average particle sizes of approximately 9 nm for the S1 sample (with 10 mL of precursor) and 10 nm for the S5 sample (with 30 mL of precursor). X-ray Diffraction (XRD) confirmed the presence of crystalline PVA/AuNPs with a face-centered cubic (fcc) structure, showing crystallite sizes ranging from 9 to 10 nm. Fourier Transform Infrared (FTIR) spectroscopy indicated a shift in the O-H band from 3325 cm−1 to 3307 cm−1, signifying strong interactions between the surfaces of AuNPs and the hydroxyl groups in PVA. Ultraviolet-Visible (UV-Vis) spectroscopy confirmed the presence of Surface Plasmon Resonance (SPR) bands for AuNPs between 520 and 550 nm, with a tunable SPR response ranging from 530.5 to 535 nm in the PVA/AuNPs films. The optical band gaps measured between 2.01 and 2.11 eV for the AuNPs and 5.09 to 5.45 eV for the PVA/AuNPs nanocomposites. Dielectric analyses demonstrated significant frequency dependency consistent with interfacial polarization. The PVA/S3 sample exhibited the highest dielectric constant. Additionally, AC conductivity increased sharply above 106 Hz, following Jonscher’s power law, which suggests that conduction occurs via hopping or tunneling mechanisms. These findings emphasize the critical role of nanoparticle dispersion in optimizing the dielectric and electrical performance of the nanocomposites.