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<p>This study explores the structural, thermal and optical properties of polyvinyl alcohol (PVA) films doped with azo dye and nickel chloride. The prepared film was characterized using different tools; X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, and UV-vis. Spectra. The XRD and EDX imaging confirms the amorphous nature, successful activation process and homogeneous particle distribution. While SEM indicates smooth surfaces with evenly distributed nanostructures, showing strong interaction between the nanoparticles and the PVA matrix, enhancing the optical properties. The TGA analysis reveals four degradation stages due to thermal decomposition of the components, while the DTA highlights the amorphous nature and thermal transitions of the film. The FTIR identifies the functional groups, confirming the integrity of the material. Optical studies show effective UV and VHF light filtering, with energy gap values for direct and indirect electronic transitions at 2.32&#xa0;eV and 1.62&#xa0;eV, respectively. The dielectric properties suggest potential applications in optoelectronics such as waveguides or light filters.</p>

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Structural and optical characterization of azo dye–nickel chloride doped PVA nanocomposite films for optoelectronic applications

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • M. D. Alshahrani,
  • Salma Alshehri,
  • F. M. Aldosari,
  • Fahad I. Almasoud,
  • Hosam M. G. Al-Qatlawi,
  • Mona M. Khalil

摘要

This study explores the structural, thermal and optical properties of polyvinyl alcohol (PVA) films doped with azo dye and nickel chloride. The prepared film was characterized using different tools; X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA), Fourier transform infrared (FTIR) spectroscopy, and UV-vis. Spectra. The XRD and EDX imaging confirms the amorphous nature, successful activation process and homogeneous particle distribution. While SEM indicates smooth surfaces with evenly distributed nanostructures, showing strong interaction between the nanoparticles and the PVA matrix, enhancing the optical properties. The TGA analysis reveals four degradation stages due to thermal decomposition of the components, while the DTA highlights the amorphous nature and thermal transitions of the film. The FTIR identifies the functional groups, confirming the integrity of the material. Optical studies show effective UV and VHF light filtering, with energy gap values for direct and indirect electronic transitions at 2.32 eV and 1.62 eV, respectively. The dielectric properties suggest potential applications in optoelectronics such as waveguides or light filters.