Enhancing dielectric properties of epoxy-based nanocomposites reinforced with yttrium oxide (Y₂O₃) nanoparticles for high-voltage insulation

Enhancing dielectric properties of epoxy-based nanocomposites reinforced with yttrium oxide (Y₂O₃) nanoparticles for high-voltage insulation

Článek WoS

This study investigates the enhancement of dielectric properties in epoxy resin-based nanocomposites by incorporating yttrium oxide nanoparticles (Y2O3) for high-voltage insulation applications. Nanocomposites with Y2O3 concentrations of 3, 6, 9, 12, and 15 wt % were fabricated and characterized. Dielectric relaxation spectroscopy (10- 2-106 Hz) was used to evaluate key parameters-including permittivity, conductivity, activation energy, and conduction mechanisms-across temperatures ranging from 30 to 170 degrees C. Structural and morphological analyses via scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) and Xray diffraction (XRD) confirmed uniform nanoparticle dispersion in the epoxy matrix, with minor agglomeration observed at higher filler loadings. The 6 wt % nanocomposite exhibited optimal performance, demonstrating the lowest permittivity, conductivity, and activation energy (9.5 meV). In contrast, increasing the Y2O3 concentration to 15 wt % raised the activation energy to 11 meV and increased permittivity. Conductivity showed a temperature-dependent rise, consistent with thermal activation. A transition in the conduction mechanism from quantum mechanical tunneling to correlated barrier hopping (CBH) occurred at 110 degrees C, accompanied by a decrease in permittivity and a shift in crossover frequency (toward lower frequencies at reduced temperatures and higher frequencies at elevated temperatures). The beta-relaxation mode remained dominant across the entire temperature range, highlighting the potential of epoxy/Y2O3 nanocomposites as advanced dielectric materials for high-voltage systems. These findings underscore a promising balance between thermal stability and dielectric efficiency.

This study investigates the enhancement of dielectric properties in epoxy resin-based nanocomposites by incorporating yttrium oxide nanoparticles (Y2O3) for high-voltage insulation applications. Nanocomposites with Y2O3 concentrations of 3, 6, 9, 12, and 15 wt % were fabricated and characterized. Dielectric relaxation spectroscopy (10- 2-106 Hz) was used to evaluate key parameters-including permittivity, conductivity, activation energy, and conduction mechanisms-across temperatures ranging from 30 to 170 degrees C. Structural and morphological analyses via scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) and Xray diffraction (XRD) confirmed uniform nanoparticle dispersion in the epoxy matrix, with minor agglomeration observed at higher filler loadings. The 6 wt % nanocomposite exhibited optimal performance, demonstrating the lowest permittivity, conductivity, and activation energy (9.5 meV). In contrast, increasing the Y2O3 concentration to 15 wt % raised the activation energy to 11 meV and increased permittivity. Conductivity showed a temperature-dependent rise, consistent with thermal activation. A transition in the conduction mechanism from quantum mechanical tunneling to correlated barrier hopping (CBH) occurred at 110 degrees C, accompanied by a decrease in permittivity and a shift in crossover frequency (toward lower frequencies at reduced temperatures and higher frequencies at elevated temperatures). The beta-relaxation mode remained dominant across the entire temperature range, highlighting the potential of epoxy/Y2O3 nanocomposites as advanced dielectric materials for high-voltage systems. These findings underscore a promising balance between thermal stability and dielectric efficiency.

Epoxy/yttria nanocomposite; High-voltage systems; Yttria; Epoxy resin

Epoxy/yttria nanocomposite; High-voltage systems; Yttria; Epoxy resin

Alsoud, A.; Shaheen, AA.; Tofel, P.; Knápek, A.; Sobola, D.

01.10.2025

ELSEVIER

AMSTERDAM

1873-4944

Materials Science and Engineering B-Advanced Functional Solid-State Materials

320

118407

Nizozemsko

10

https://www.sciencedirect.com/science/article/pii/S0921510725004313?via%3Dihub