Influence of Germanium oxide nanoparticles on the electrical conductivity of Li-ion conducting NaCMC/PVA nanocomposite films

Seshan, T. N. and Vipin, C. and Demappa, T. and Ismayil (2025) Influence of Germanium oxide nanoparticles on the electrical conductivity of Li-ion conducting NaCMC/PVA nanocomposite films. Solid State Ionics, 431. ISSN 01672738

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Abstract

This study examines the influence of GeO2 nanoparticles (NPs) on the ionic conductivity and structural properties of NaCMC/PVA/LiBr-based solid polymer electrolytes synthesized via solution casting technique. XRD analysis revealed enhanced amorphous character with increasing GeO2 content. FTIR spectra confirmed interactions between GeO2 NPs and the polymer-salt matrix. SEM and EDX analyses were used to investigate morphology and elemental composition. UV–Vis spectroscopy showed a redshift in absorption edge and a bandgap reduction from 5.70 to 5.50 eV with GeO2 addition. Impedance spectroscopy (100 Hz - 5 MHz) indicated improved ionic conductivity, following Jonscher's universal power law, with a maximum value of (1.13 ± 0.02) × 10−5 S cm−1 at 5 wt% GeO2. LSV confirmed electrochemical stability up to 2.7 V. Dielectric studies revealed an increase in permittivity due to interfacial polarization. Transference number measurement evaluates the relative contributions of ionic and electronic charge carriers in solid polymer electrolytes using polarization technique. These results highlight the potential of GeO2-dispersed NaCMC/PVA/LiBr films for energy storage applications. © 2025

Item Type:	Article
Uncontrolled Keywords:	Dielectric permittivity; Impedance spectroscopy; Ionic conductivity; NaCMC/PVA; Polymer electrolytes; polymer nanocomposites
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	Vasantha library uom
Date Deposited:	29 Nov 2025 11:41
Last Modified:	29 Nov 2025 11:41
URI:	http://eprints.uni-mysore.ac.in/id/eprint/18110

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