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<p>Polymer nanocomposites with noble metal nanoparticles exhibit tunable optical and electrical properties, making them promising for advanced applications. In this study, gold nanoparticles (AuNPs) were synthesized via the citrate reduction method, varying the HAuCl₄ precursor volume from 10 to 30 mL to control size and concentration. These AuNPs were incorporated into polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) blend films prepared by solution casting. The effects of different AuNPs concentration on the structural, and optical properties of were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, UV–Vis spectroscopy, and broadband dielectric spectroscopy. TEM showed that AuNPs synthesized with 10 mL of HAuCl₄ averaged 15.2 nm, while those from 30 mL averaged 28.7 nm. XRD indicated enhanced structural ordering in the polymer matrix, and FTIR spectroscopy confirmed interactions between AuNPs and polymer functional groups. UV–Vis spectroscopy demonstrated successful plasmonic formation, showing surface plasmon resonance bands between 525 and 540 nm. The optical band gap slightly decreased from 5.27 eV to 5.21–5.25 eV with AuNP incorporation, indicating electronic interactions. Dielectric studies revealed enhanced polarization and modified charge transport due to AuNPs. Overall, the structural, optical and dielectric characteristics of the PVA–PVP nanocomposites are efficiently controlled by changing the AuNPs concentration, showing the potentiality for optoelectronic and dielectric applications.</p>

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Properties of gold nanoparticle-embedded PVA-PVP nanocomposite films: effects of gold precursor concentration and PVA-PVP/gold nanoparticle interaction on structural, optical, and dielectric characteristics

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Fatmah A. Al-Marhaby,
  • Ahmed Abdelkarim,
  • Roshdi Seoudi

摘要

Polymer nanocomposites with noble metal nanoparticles exhibit tunable optical and electrical properties, making them promising for advanced applications. In this study, gold nanoparticles (AuNPs) were synthesized via the citrate reduction method, varying the HAuCl₄ precursor volume from 10 to 30 mL to control size and concentration. These AuNPs were incorporated into polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) blend films prepared by solution casting. The effects of different AuNPs concentration on the structural, and optical properties of were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, UV–Vis spectroscopy, and broadband dielectric spectroscopy. TEM showed that AuNPs synthesized with 10 mL of HAuCl₄ averaged 15.2 nm, while those from 30 mL averaged 28.7 nm. XRD indicated enhanced structural ordering in the polymer matrix, and FTIR spectroscopy confirmed interactions between AuNPs and polymer functional groups. UV–Vis spectroscopy demonstrated successful plasmonic formation, showing surface plasmon resonance bands between 525 and 540 nm. The optical band gap slightly decreased from 5.27 eV to 5.21–5.25 eV with AuNP incorporation, indicating electronic interactions. Dielectric studies revealed enhanced polarization and modified charge transport due to AuNPs. Overall, the structural, optical and dielectric characteristics of the PVA–PVP nanocomposites are efficiently controlled by changing the AuNPs concentration, showing the potentiality for optoelectronic and dielectric applications.