Collection of scientific works Nanosystems, nanomaterials, nanotechnologies Year 2023 Volume 21, Issue 4
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Majeed Ali Habeeb and Zanab Ibrahim Zike
Morphological and Optical Properties of Polyvinyl Alcohol–Tungsten Carbide Nanostructures for Optoelectronic Nanodevices
791–802 (2023)

PACS numbers: 78.20.Ci, 78.67.Sc, 81.05.Qk, 81.07.Pr, 81.40.Tv, 82.35.Np, 85.60.-q

The PVA/WC nanocomposites are formed by using a solution casting method with varying weight percentages of WC nanoparticles: 0, 1, 2, and 3 wt.%. The optical properties of films are studied by means of the optical microscope. As revealed with optical microscope, the tungsten carbide nanoparticles form a continuous network inside the polymer (polyvinyl alcohol); the nanoparticles linked in this network include routes for charge carriers to transport through the nanocomposite, causing a shift in the material properties. The findings expose that, as the concentration of WC nanoparticles rises, the absorption coefficient, extinction coefficient, refractive index, real and imaginary dielectric constants, optical conductivity are increasing. The transmittance drops as the concentration of WC nanoparticles increases. The optical energy gap for PVA is reduced from 4.4 eV for pure PVA to 3.8 eV and is reduced from 3.7 eV to 3.1 eV for allowed and forbidden indirect transition, respectively, when the WC-nanoparticles’ concentration reached 3 wt.%. This behaviour makes it suitable for a variety of optical applications.

Key words: nanocomposites, tungsten carbide nanoparticles, optical characteristics.

Issue DOI:  https://doi.org/10.15407/nnn.21.04.791

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