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<p>This study aims to fabricate of polyvinyl alcohol (PVA)-chitosan (CS)-niobium carbide (NbC)- silicon dioxide (SiO<sub>2</sub>) quaternary nanocomposites films for optical and electronic devices applications. The microstructural, optical, and dielectric features of) PVA–CS–NbC–SiO<sub>2</sub> (nanocomposites films were examined. The results showed that the incorporation of SiO<sub>2</sub> and NbC nanoparticles into the (PVA–CS) polymer matrix led to improve the structural characteristics, optical performance, and dielectric behavior. The results of optical features revealed that increasing the concentration of (NbC–SiO<sub>2</sub>) nanoparticles leads to a noticeable enhancement in absorbance, absorption coefficient, refractive index, dielectric parameters and optical conductivity, while the transmittance of the films was reduced. Furthermore, the energy gap of the polymer blend was decreased to 2.4&#xa0;eV for allowed transitions and to 1.4&#xa0;eV for forbidden transition, as the NbC–SiO<sub>2</sub> content rises. The dielectric properties results showed that dielectric constant (ɛ′), dielectric loss (ε′′), and electrical conductivity were enhanced with rising NbC–SiO<sub>2</sub> content. These findings making (PVA–CS–NbC–SiO<sub>2</sub>) films a promising materials for optoelectronic and nanoelectronic applications. The pressure sensor results showed the (PVA–CS–NbC–SiO<sub>2</sub>) films have high sensitivity. The results of gamma ray shielding showed the (PVA–CS–NbC–SiO<sub>2</sub>) films have high attenuation coefficients for gamma radiation.</p>

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Fabrication and Exploring the Microstructural, Optical and Dielectric Performance of PVA–CS–NbC–SiO2 Futuristic Nanostructures for Advanced Optoelectronics Applications

  • 期刊论文

  • 发表日期：

    2025年12月30日

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  • Wissam Obeis Obaid,
  • Ahmed Hashim,
  • Bahaa H. Rabee

摘要

This study aims to fabricate of polyvinyl alcohol (PVA)-chitosan (CS)-niobium carbide (NbC)- silicon dioxide (SiO2) quaternary nanocomposites films for optical and electronic devices applications. The microstructural, optical, and dielectric features of) PVA–CS–NbC–SiO2 (nanocomposites films were examined. The results showed that the incorporation of SiO2 and NbC nanoparticles into the (PVA–CS) polymer matrix led to improve the structural characteristics, optical performance, and dielectric behavior. The results of optical features revealed that increasing the concentration of (NbC–SiO2) nanoparticles leads to a noticeable enhancement in absorbance, absorption coefficient, refractive index, dielectric parameters and optical conductivity, while the transmittance of the films was reduced. Furthermore, the energy gap of the polymer blend was decreased to 2.4 eV for allowed transitions and to 1.4 eV for forbidden transition, as the NbC–SiO2 content rises. The dielectric properties results showed that dielectric constant (ɛ′), dielectric loss (ε′′), and electrical conductivity were enhanced with rising NbC–SiO2 content. These findings making (PVA–CS–NbC–SiO2) films a promising materials for optoelectronic and nanoelectronic applications. The pressure sensor results showed the (PVA–CS–NbC–SiO2) films have high sensitivity. The results of gamma ray shielding showed the (PVA–CS–NbC–SiO2) films have high attenuation coefficients for gamma radiation.