The current work aims to exploring the morphological, structural, dielectric, and linear/nonlinear optical properties of SiC-ZnO NPs-doped blended PVA-PVP for use in advanced radiation shielding and optoelectronic applications. The structural, dielectric, and linear/nonlinear optical properties of PVA-PVP/ZnO-SiC NCs were investigated. Different concentrations of SiC-ZnO nanoparticles were added to the polymer blend (0wt.%, 2wt.%, 4wt.%,6wt.%, and 8wt.%). The PVA-PVP/SiC-ZnO NCs were examined by optical microscopy, Fourier Transform Infrared (FTIR) analysis, and XRD diffraction (FE-SEM). X-ray diffraction (XRD) analysis revealed that the (PVA-PVP) blend was amorphous. Additionally, we observed peaks for different nanoparticles at all concentrations of the nanocomposite samples. As the nanofiller concentration increased, the band gaps of PVA-PVP/SiC-ZnO polymer nanocomposites reduced from 4.78 to 2.96 eV for allowed transitions and from 4.75 to 2.70 eV for forbidden transitions. The results demonstrate a positive correlation among the observed absorption values, the coefficient of absorption (α), refractive index (n), dielectric constants (real and imaginary), and optical conductivity (σop) when the concentrations of (SiC–ZnO) nanoparticles increase, particularly in the UV and visible spectra. The dispersion of energy (Ed), average oscillator strength (So), and single-oscillator energy (Eoso) all decrease as the concentration of nanoparticles increases. Conversely, the linear susceptibility<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\left({\chi\:}^{\left(1\right)}\right)\)</EquationSource> </InlineEquation>, Urbach tail energy (Eu), nonlinear susceptibility <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\:\left({\chi\:}^{\left(3\right)}\right)\)</EquationSource> </InlineEquation>, nonlinear refractive index (n2), average oscillator parameter (λo), zero-frequency dielectric constant (εo), and zero-frequency refractive index (no) increase with increased nanoparticle concentration. The highest concentration of nanoparticles was distinctly observed at a specific wavelength of 450 nm, suggesting their potential as promising materials for nano-focused optoelectronic applications. With increasing Frequency, the electrical properties of nanostructures in alternating current (AC) are affected, especially the decrease of (ɛ’ and ε”). On the other hand, we improved these properties with higher concentrations of SiC-ZnO nanoparticles. At an eight weight per cent concentration of (SiC-ZnO) NPs in the (PVA-PVP) polymer, the best AC conductivity we achieved was measured to be 1.61 × 10^-11 S/cm at 100 Hz. The results demonstrate that the PVA-PVP/SiC-ZnO nanostructure films exhibit remarkable electrical and optical properties, making them highly desirable for applications in electronic devices and optical nanotechnology. According to the study’s findings on gamma shielding, the PVA-PVP/SiC-ZnO nanocomposites exhibit excellent gamma ray attenuation coefficients.

Synthesis and exploring morphological, structural, conductivity, dielectric and linear/nonlinear optical properties of PVA-PVP/SiC-ZnO nanostructures for optoelectronics and radiation shielding applications

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发表日期：

2025年8月28日

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

摘要

The current work aims to exploring the morphological, structural, dielectric, and linear/nonlinear optical properties of SiC-ZnO NPs-doped blended PVA-PVP for use in advanced radiation shielding and optoelectronic applications. The structural, dielectric, and linear/nonlinear optical properties of PVA-PVP/ZnO-SiC NCs were investigated. Different concentrations of SiC-ZnO nanoparticles were added to the polymer blend (0wt.%, 2wt.%, 4wt.%,6wt.%, and 8wt.%). The PVA-PVP/SiC-ZnO NCs were examined by optical microscopy, Fourier Transform Infrared (FTIR) analysis, and XRD diffraction (FE-SEM). X-ray diffraction (XRD) analysis revealed that the (PVA-PVP) blend was amorphous. Additionally, we observed peaks for different nanoparticles at all concentrations of the nanocomposite samples. As the nanofiller concentration increased, the band gaps of PVA-PVP/SiC-ZnO polymer nanocomposites reduced from 4.78 to 2.96 eV for allowed transitions and from 4.75 to 2.70 eV for forbidden transitions. The results demonstrate a positive correlation among the observed absorption values, the coefficient of absorption (α), refractive index (n), dielectric constants (real and imaginary), and optical conductivity (σ_op) when the concentrations of (SiC–ZnO) nanoparticles increase, particularly in the UV and visible spectra. The dispersion of energy (E_d), average oscillator strength (S_o), and single-oscillator energy (E_oso) all decrease as the concentration of nanoparticles increases. Conversely, the linear susceptibility \(\:\left({\chi\:}^{\left(1\right)}\right)\) , Urbach tail energy (E_u), nonlinear susceptibility \(\:\left({\chi\:}^{\left(3\right)}\right)\) , nonlinear refractive index (n₂), average oscillator parameter (λ_o), zero-frequency dielectric constant (ε_o), and zero-frequency refractive index (n_o) increase with increased nanoparticle concentration. The highest concentration of nanoparticles was distinctly observed at a specific wavelength of 450 nm, suggesting their potential as promising materials for nano-focused optoelectronic applications. With increasing Frequency, the electrical properties of nanostructures in alternating current (AC) are affected, especially the decrease of (ɛ’ and ε”). On the other hand, we improved these properties with higher concentrations of SiC-ZnO nanoparticles. At an eight weight per cent concentration of (SiC-ZnO) NPs in the (PVA-PVP) polymer, the best AC conductivity we achieved was measured to be 1.61 × 10^-11 S/cm at 100 Hz. The results demonstrate that the PVA-PVP/SiC-ZnO nanostructure films exhibit remarkable electrical and optical properties, making them highly desirable for applications in electronic devices and optical nanotechnology. According to the study’s findings on gamma shielding, the PVA-PVP/SiC-ZnO nanocomposites exhibit excellent gamma ray attenuation coefficients.