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Collection of scientific works Nanosistemi, Nanomateriali, Nanotehnologii Year 2025 Vol. 23, Issue 1
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Majeed Ali HABEEB, Idrees OREIBI, Rehab Shather Abdul HAMZA, Dhay Ali SUBAR, and Khalid AL-AMMAR

Effect of WC-Nanoparticles' Addition on the Structural and Dielectric Characteristics of a Biopolymer

177–189 (2025)

PACS numbers: 72.80.Tm, 77.22.Ch, 77.22.Gm, 78.30.Jv, 81.07.Pr, 82.35.Np

This study involves preparing nanocomposites consisting of polyvinyl alcohol (PVA) and tungsten carbide (WC) nanoparticles. The casting process is employed to create these nanocomposites, with varying weight percentages of WC nanoparticles: 0, 1, 2, and 3 wt.%. Various ways of diagnosis are employed to analyse the PVA–WC nanocomposites, including Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) imaging, and optical microscopy imaging. The experimental findings obtained from the images captured by an optical microscope reveal the spatial arrangement of tungsten-carbide nanoparticles throughout all nanocomposite films. Additionally, these results demonstrate the presence of a cohesive network of ions dispersed throughout the polymer matrix, with a tungsten-carbide nanoparticles' concentration of 3 wt.%. Furthermore, the experimental findings obtained from Fourier-transform infrared spectroscopy (FTIR) demonstrate an upward trend between the absorbance values of the PVA–WC nanocomposites and the fraction of tungsten-carbide nanoparticles. The peak properties remain consistent, and most bonds exhibit similar wavenumbers. The electrical characteristics of nanocomposites are investigated in the frequency range of 100-to-5×106 Hz at ambient temperature. The analysis of the A.C. electric properties reveals that, as the frequency of the applied electrical field increases, the dielectric constant and dielectric loss of the nanocomposites diminish. In contrast, these properties indicate an increase with tungsten-carbide nanoparticles' concentration. Additionally, the A.C. electrical conductivity of the nanocomposites displays an increase with higher concentrations of tungsten-carbide nanoparticles and frequency, while remaining relatively constant at high frequencies. The conclusive findings indicate that the nanostructures composed of polyvinyl alcohol and tungsten carbide (PVA–WC) possess potential applications in diverse electrical and electronic nanodevices

KEY WORDS: PVA, WC nanoparticles, nanocomposites, electrical properties

DOI:  https://doi.org/10.15407/nnn.23.01.0177

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