Abstract
This study aims to optimize the optical and electrical performance of polyvinyl alcohol/polyethylene oxide (PVA/PEO) incorporated with magnesium oxide (MgO) and bismuth(iii) oxide (Bi(2)O(3)) nanoparticles synthesized by pulsed laser ablation over different durations. XRD revealed that the MgO nanoparticles acted as nucleating centers, increasing crystallinity. The incorporation of Bi(2)O(3) resulted in sharper peaks and improved phase ordering with a prolonged ablation time. The FTIR spectra showed strong interactions between the PVA/PEO blend and nanoparticles, mediated by hydrogen bonding and novel vibrational modes between the metal and oxygen. UV-DRS showed optical modification and redshift of the absorption edge with a prolonged ablation time, indicating improved nanoparticle homogeneity, size growth, and crystallinity. TGA demonstrated an enhancement in the thermal stability of the Bi(2)O(3)/MgO double-filler composite. Dielectric and AC conductivity studies demonstrated a frequency behavior consistent with Maxwell-Wagner-Sillars interface polarization. Increasing the ablation time resulted in a decrease in the dielectric constant and conductivity, which was attributed to the small size and good dispersion of the nanoparticles and the restricted charge mobility due to the interface adhesion force.