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<p>This study investigates the development and performance of a room-temperature nitrogen dioxide (NO<sub>2</sub>) gas sensor based on polyaniline-zinc oxide (PANi-ZnO) nanocomposites. The primary aim is to enhance gas sensing efficiency through the incorporation of zinc oxide (ZnO) nanoparticles into the polyaniline (PANi) matrix. PANi and PANi-ZnO nanocomposites were synthesized via a chemical in-situ polymerization method with varying ZnO weight percentages (10–40 wt.%). The structural and morphological characteristics were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FT-IR). XRD confirmed the polycrystalline nature of ZnO with an average crystallite size of 38.27&#xa0;nm, while PANi exhibited an amorphous structure. SEM analysis showed a uniform distribution of ZnO nanoparticles within the PANi matrix, and FT-IR indicated strong PANi-ZnO interactions. Gas sensing performance was evaluated at room temperature (29&#xa0;°C) and 45% relative humidity. The 30 wt.% PANi-ZnO nanocomposite demonstrated optimal performance, achieving a high sensitivity of 55.75% at 25,000 parts per million by volume (PPMv) of NO<sub>2</sub>, with a response time of 35&#xa0;s and a recovery time of 45&#xa0;s. Long-term stability tests over 30&#xa0;days confirmed sensor durability. These findings suggest that PANi-ZnO nanocomposites are promising candidates for efficient and stable NO<sub>2</sub> gas sensing applications under ambient conditions.</p>

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Novel synthesis of PANi-ZnO nanocomposites for enhanced NO2 gas sensing performance at room temperature

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Gavisiddayya Mathad,
  • Deepa Pathar,
  • Subramanya K

摘要

This study investigates the development and performance of a room-temperature nitrogen dioxide (NO2) gas sensor based on polyaniline-zinc oxide (PANi-ZnO) nanocomposites. The primary aim is to enhance gas sensing efficiency through the incorporation of zinc oxide (ZnO) nanoparticles into the polyaniline (PANi) matrix. PANi and PANi-ZnO nanocomposites were synthesized via a chemical in-situ polymerization method with varying ZnO weight percentages (10–40 wt.%). The structural and morphological characteristics were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FT-IR). XRD confirmed the polycrystalline nature of ZnO with an average crystallite size of 38.27 nm, while PANi exhibited an amorphous structure. SEM analysis showed a uniform distribution of ZnO nanoparticles within the PANi matrix, and FT-IR indicated strong PANi-ZnO interactions. Gas sensing performance was evaluated at room temperature (29 °C) and 45% relative humidity. The 30 wt.% PANi-ZnO nanocomposite demonstrated optimal performance, achieving a high sensitivity of 55.75% at 25,000 parts per million by volume (PPMv) of NO2, with a response time of 35 s and a recovery time of 45 s. Long-term stability tests over 30 days confirmed sensor durability. These findings suggest that PANi-ZnO nanocomposites are promising candidates for efficient and stable NO2 gas sensing applications under ambient conditions.