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<p>In this work, the solution-casting approach was employed to produce polymer nanocomposites based on polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and sol–gel-synthesized CeO<sub>2</sub>-graphene nanoparticles (CeO<sub>2</sub>-G NPs). A comprehensive characterization was conducted using XRD, HR-TEM, FTIR, SEM, DSC, UV–vis. spectroscopy, and dielectric measurements. The structural characteristics of the PVA/PVP/PEG blend polymer had been significantly altered by the incorporation of CeO2-G NPs, as indicated by the XRD patterns of the doped samples. According to TEM results, the average CeO<sub>2</sub>-G NPs size was 13.15 nm. Polymer–polymer interactions within these polymer nanocomposites had been primarily altered by the polymer-nanoparticle complexations/interactions as depicted by Fourier transform infrared (FTIR) spectroscopy. SEM micrographs of CeO<sub>2</sub>-G NPs morphology mainly present nanosheets and nanoparticles, while a layer-to-layer stack-like sandwich structure is observed for 5.00 wt.% CeO<sub>2</sub>-G nanocomposite film depicting the complexation between the constituents of polymer nanocomposites. The thermal stability improved with CeO<sub>2</sub>-G NPs as presented by the DSC technique, where T<sub>g</sub> and T<sub>m</sub> values grew with a rise in the hybrid nanofiller concentration. The increase in the CeO<sub>2</sub>-G NPs content improved the optical characteristics, such as the optical conductivity, refractive index, and optical dielectric constants of the (PVA/PVP/PEG) blend. In contrast, the transmittance decreased significantly as the ratio of CeO<sub>2</sub>-G NPs content increased. The average <i>n</i> value for the CeO<sub>2</sub>-G NPs/(PVA/PVP/PEG) films enhances from 1.994 to 2.084 eV for the direct bandgap and from 2.058 to 2.477 eV for the indirect energy band gaps The AC electrical conductivity and dielectric behavior have been examined at various temperatures in the frequency range 100 Hz-1 MHz, where their values progressively rose with temperature for all prepared films; at the same time, the dielectric characteristics of the base matrix were considerably enhanced by using hybrid nanofiller CeO<sub>2</sub>-G NPs. Therefore, the experimental results imply the feasibility of CeO<sub>2</sub>-G NPs/(PVA/PVP/PEG) nanocomposites for the development of high-functional optoelectronic&#xa0;devices.</p>

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Impact of CeO₂–graphene hybrid nanofiller on the structural, optical, thermal, and electrical properties of PVA/PVP/PEG ternary polymeric blend

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Doaa Abdelhameed,
  • M.I.Mohammed,
  • Talal F. Qahtan,
  • M. A. Morsi

摘要

In this work, the solution-casting approach was employed to produce polymer nanocomposites based on polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and sol–gel-synthesized CeO2-graphene nanoparticles (CeO2-G NPs). A comprehensive characterization was conducted using XRD, HR-TEM, FTIR, SEM, DSC, UV–vis. spectroscopy, and dielectric measurements. The structural characteristics of the PVA/PVP/PEG blend polymer had been significantly altered by the incorporation of CeO2-G NPs, as indicated by the XRD patterns of the doped samples. According to TEM results, the average CeO2-G NPs size was 13.15 nm. Polymer–polymer interactions within these polymer nanocomposites had been primarily altered by the polymer-nanoparticle complexations/interactions as depicted by Fourier transform infrared (FTIR) spectroscopy. SEM micrographs of CeO2-G NPs morphology mainly present nanosheets and nanoparticles, while a layer-to-layer stack-like sandwich structure is observed for 5.00 wt.% CeO2-G nanocomposite film depicting the complexation between the constituents of polymer nanocomposites. The thermal stability improved with CeO2-G NPs as presented by the DSC technique, where Tg and Tm values grew with a rise in the hybrid nanofiller concentration. The increase in the CeO2-G NPs content improved the optical characteristics, such as the optical conductivity, refractive index, and optical dielectric constants of the (PVA/PVP/PEG) blend. In contrast, the transmittance decreased significantly as the ratio of CeO2-G NPs content increased. The average n value for the CeO2-G NPs/(PVA/PVP/PEG) films enhances from 1.994 to 2.084 eV for the direct bandgap and from 2.058 to 2.477 eV for the indirect energy band gaps The AC electrical conductivity and dielectric behavior have been examined at various temperatures in the frequency range 100 Hz-1 MHz, where their values progressively rose with temperature for all prepared films; at the same time, the dielectric characteristics of the base matrix were considerably enhanced by using hybrid nanofiller CeO2-G NPs. Therefore, the experimental results imply the feasibility of CeO2-G NPs/(PVA/PVP/PEG) nanocomposites for the development of high-functional optoelectronic devices.