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<p>Traditional gas sensing devices are often limited by slow response times and lower stability, especially under ambient conditions. To address these challenges, the development of multifunctional thin-film nanocomposites integrating functional components provides a hopeful solution to overcome these limitations. The study focuses on the fabrication and characterization of polypyrrole/polyvinyl alcohol/ molybdenum trioxide/Graphene nanocomposite (PPy/ PVA/MoO<sub>3</sub>/G) nanocomposite thin films developed for gas sensing applications. This nanocomposite uniquely combines conductive polymers, metal oxides, and 2D materials to create a multifunctional sensing matrix. The films were deposited on glass substrates using the chemical spray pyrolysis technique at 400&#xa0;°C. Characterization of the films using field emission scanning electron microscopy (FESEM) revealed grass-like nanostructures distributed uniformly, while X-ray diffraction (XRD) patterns showed a polycrystalline structure with a mixture of tetragonal anatase and cubic phases. Optical characterization studies demonstrate high transparency and thermal stability with red shifts in absorption edges associated with increased TiO<sub>2</sub> content. The band gap was estimated using UV-Vis spectroscopy to confirm that the high quality of the thin films exhibited suitable optical properties with distinguishable absorption features. Overall, the PPy/PVA/MoO₃/G thin films exhibit favorable structural, morphological, optical, and electronic characteristics, underscoring their potential for high-performance gas sensor applications.</p>

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Structural and optical properties of thin compound oxides film based on PVA + PPy + MoO3 + graphene nanostructure

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Farah T.M. Noori,
  • Fuad. T Ibrahim,
  • Nadia A. Ali,
  • A. Kadhim,
  • Seenaa I. Hussein,
  • Mohammed K. Jawad,
  • Khalid Hsaan Ibnaouf,
  • Eltayeb I. A. Elbeshir

摘要

Traditional gas sensing devices are often limited by slow response times and lower stability, especially under ambient conditions. To address these challenges, the development of multifunctional thin-film nanocomposites integrating functional components provides a hopeful solution to overcome these limitations. The study focuses on the fabrication and characterization of polypyrrole/polyvinyl alcohol/ molybdenum trioxide/Graphene nanocomposite (PPy/ PVA/MoO3/G) nanocomposite thin films developed for gas sensing applications. This nanocomposite uniquely combines conductive polymers, metal oxides, and 2D materials to create a multifunctional sensing matrix. The films were deposited on glass substrates using the chemical spray pyrolysis technique at 400 °C. Characterization of the films using field emission scanning electron microscopy (FESEM) revealed grass-like nanostructures distributed uniformly, while X-ray diffraction (XRD) patterns showed a polycrystalline structure with a mixture of tetragonal anatase and cubic phases. Optical characterization studies demonstrate high transparency and thermal stability with red shifts in absorption edges associated with increased TiO2 content. The band gap was estimated using UV-Vis spectroscopy to confirm that the high quality of the thin films exhibited suitable optical properties with distinguishable absorption features. Overall, the PPy/PVA/MoO₃/G thin films exhibit favorable structural, morphological, optical, and electronic characteristics, underscoring their potential for high-performance gas sensor applications.