Optimizing PEO/HPMC polymer blends with Al2O3/MoO3 as hybrid nanofiller for enhanced dielectric performance and energy storage systems
Keywords:
HPMC/PEO/Al₂O₃-MoO₃ nanocomposite samples were prepared using casting method. • The optical and structural features of the nanocomposite were improved with addition of Al₂O₃-MoO₃ nanofiller. • Electric modulus analysis showed enhanced ionic behavior of the nanocomposite nanofilms. • EIS data showed a significant reduction in impedance, supporting improved electrical properties. • The obtained results indicated that these samples are suitable for advanced nanodielectric devices and energy storage.Abstract
This study investigates the synergistic effects of aluminum oxide nanoparticles (Al₂O₃ NPs) and molybdenum trioxide nanobelts (MoO₃ NBs) on the structural, optical, and electrical properties of hydroxypropyl methylcellulose (HPMC) and polyethylene oxide (PEO) polymer blends prepared using solution casting method. Structural characterization revealed reduced crystallinity by XRD analysis and strong interfacial interactions by FTIR spectroscopy, confirming effective nanofillers complexation with PEO/HPMC matrix. UV–Vis analysis revealed significant reductions in both direct and indirect optical band gaps upon nanofillers incorporation. The nanofillers also improved dielectric performance, with AC conductivity increasing from 2.63 × 10−10 S/cm (pure blend) to 8.85 × 10−9 S/cm (1.2 wt% nanofiller) at 1 kHz. Dielectric results showed optimal performance at 1.2 wt% Al₂O₃-MoO₃ loading, exhibiting the highest dielectric constant among all formulations. Nyquist plots analysis demonstrated improved bulk conductivity and emerging double-layer capacitance, suggesting improved charge storage capabilities at electrode-electrolyte interfaces. SEM analysis revealed homogeneous dispersion of Al₂O₃-MoO₃ nanofillers in PEO/HPMC matrix at loadings ≤1.2 wt%, while significant aggregation was observed at higher concentrations. With their superior dielectric response and enhanced ionic conductivity, these Al₂O₃/MoO₃-PEO/HPMC nanocomposite films show outstanding promise for both nanodielectric devices and advanced energy storage systems.References
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