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<p>This study aims to develop advanced polymer nanocomposites with enhanced optical, electrical, and mechanical properties for potential use in flexible electronics and radiation shielding.A polymer blend of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) was reinforced with varying concentrations of silicon carbide (SiC) and bismuth oxide (Bi₂O₃) nanoparticles. The incorporation of these fillers significantly improved the dielectric properties, electrical conductivity, and nonlinear optical behavior of the nanocomposites. The present research tested the optical, structural, morphological, pressure sensor and gamma shielding characteristics of (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) nanocomposites. The blended homog enous nanoparticle distribution, which forms a unified network across the polymer matrix, is shown in the optical microscope photos. The findings of optical characteristics reveal that absorbance, absorption coefficient, refractive index, dielectric constant (both real and imaginary), and optical conductivity exhibit an upward trend with increasing concentrations of (SiC-Bi<sub>2</sub>O<sub>3</sub>) nanoparticles. At the same time, the transmittance of the nanocomposites decreases as the concentration of nanoparticles increases. The band gaps of (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) polymer nanocomposites decrease from 5.65 to 2.66&#xa0;eV for allowed transitions as well as from 5.43 to 2.01&#xa0;eV for disallowed transitions with an increase in (SiC- Bi<sub>2</sub>O<sub>3</sub>) nanoparticles concentration. The dispersion of energy (E<sub>d</sub>), average oscillator strength (S<sub>o</sub>), and single-oscillator energy (E<sub>oso</sub>) all decrease as the concentration of nanoparticles increases. Conversely, the Urbach tail energy (E<sub>u</sub>), linear susceptibility (χ<sup>(1)</sup>), nonlinear susceptibility (χ<sup>(3)</sup>), nonlinear refractive index (n<sub>2</sub>), average oscillator parameter (λ<sub>o</sub>), zero-frequency dielectric constant (ε<sub>o</sub>), and zero-frequency refractive index (n<sub>o</sub>) increase. The electrical properties indicate that the dielectric constant (ɛ'), dielectric loss (<b>ε</b>"), and electrical conductivity increase as the concentration of nanoparticles increases. The results demonstrate that the (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) nanostructured films exhibit outstanding electrical and optical properties, making them promising candidates for electronic devices and optical nanotechnology applications. The outcomes of the pressure sensor evaluation indicate that (PVA–PVP/SiC- Bi<sub>2</sub>O<sub>3</sub>) nanostructures exhibit superior environmental stability, outstanding mechanical flexibility, and exceptional pressure sensitivity compared to other sensor materials. When gamma rays expose the (PVA–PVP/SiC-Bi<sub>2</sub>O<sub>3</sub>) PNC films, they exhibit remarkably high decay coefficients. This nanocomposite shows excellent promise as a suitable material for flexible nanodevices applications.</p>

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Preparation and Modulation of the Morphological, Structural, Electrical, Dielectric and Linear/Nonlinear Optical Characteristics of PVA-PVP/SiC-Bi2O3 Nancomposites for Energy Storage Devices and Radiation Attenuation

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Jassim M. AL-Issawe,
  • Majeed Ali Habeeb,
  • Ali R. Abdulridha

摘要

This study aims to develop advanced polymer nanocomposites with enhanced optical, electrical, and mechanical properties for potential use in flexible electronics and radiation shielding.A polymer blend of polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP) was reinforced with varying concentrations of silicon carbide (SiC) and bismuth oxide (Bi₂O₃) nanoparticles. The incorporation of these fillers significantly improved the dielectric properties, electrical conductivity, and nonlinear optical behavior of the nanocomposites. The present research tested the optical, structural, morphological, pressure sensor and gamma shielding characteristics of (PVA–PVP/SiC-Bi2O3) nanocomposites. The blended homog enous nanoparticle distribution, which forms a unified network across the polymer matrix, is shown in the optical microscope photos. The findings of optical characteristics reveal that absorbance, absorption coefficient, refractive index, dielectric constant (both real and imaginary), and optical conductivity exhibit an upward trend with increasing concentrations of (SiC-Bi2O3) nanoparticles. At the same time, the transmittance of the nanocomposites decreases as the concentration of nanoparticles increases. The band gaps of (PVA–PVP/SiC-Bi2O3) polymer nanocomposites decrease from 5.65 to 2.66 eV for allowed transitions as well as from 5.43 to 2.01 eV for disallowed transitions with an increase in (SiC- Bi2O3) nanoparticles concentration. The dispersion of energy (Ed), average oscillator strength (So), and single-oscillator energy (Eoso) all decrease as the concentration of nanoparticles increases. Conversely, the Urbach tail energy (Eu), linear susceptibility (χ(1)), nonlinear susceptibility (χ(3)), nonlinear refractive index (n2), average oscillator parameter (λo), zero-frequency dielectric constant (εo), and zero-frequency refractive index (no) increase. The electrical properties indicate that the dielectric constant (ɛ'), dielectric loss (ε"), and electrical conductivity increase as the concentration of nanoparticles increases. The results demonstrate that the (PVA–PVP/SiC-Bi2O3) nanostructured films exhibit outstanding electrical and optical properties, making them promising candidates for electronic devices and optical nanotechnology applications. The outcomes of the pressure sensor evaluation indicate that (PVA–PVP/SiC- Bi2O3) nanostructures exhibit superior environmental stability, outstanding mechanical flexibility, and exceptional pressure sensitivity compared to other sensor materials. When gamma rays expose the (PVA–PVP/SiC-Bi2O3) PNC films, they exhibit remarkably high decay coefficients. This nanocomposite shows excellent promise as a suitable material for flexible nanodevices applications.