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<p>Zinc oxide (ZnO) and reduced graphene oxide-doped ZnO (rGO-ZnO) nanorods were successfully synthesized via a cost-effective and facile reflux method. The structural and optical characteristics of the as-prepared samples were thoroughly investigated using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), and UV–Visible Spectroscopy. XRD analysis confirmed the crystalline nature of the samples, indicating a preferential growth orientation along the c-axis. Raman spectra validated the successful incorporation of graphene within the ZnO matrix, along with characteristic phonon modes of ZnO. SEM images revealed densely packed, vertically aligned hexagonal nanorods with uniform morphology. A comparative gas sensing study was conducted to evaluate the NO₂ detection performance of pristine ZnO and rGO-ZnO nanorod films under ambient conditions. The rGO-ZnO sensor exhibited significantly enhanced sensitivity and faster response towards NO₂ gas. The rGO-ZnO exhibits 110% sensitivity at 4 ppm of NO₂, whereas at the same concentration, undoped ZnO shows only 7%. These findings suggest that rGO incorporation into ZnO nanorods substantially improves NO₂ gas sensing performance, making them promising candidates for low-concentration gas detection applications.</p>

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Facile reflux growth of rGO-ZnO nanorods for high-sensitivity NO₂ gas sensors

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • S. M. Lengare,
  • P. S. Beloshe,
  • S. G. Puri,
  • A. T. Jadhav,
  • P. B. Kashid,
  • S. H. Mujawar,
  • S. S. Patil

摘要

Zinc oxide (ZnO) and reduced graphene oxide-doped ZnO (rGO-ZnO) nanorods were successfully synthesized via a cost-effective and facile reflux method. The structural and optical characteristics of the as-prepared samples were thoroughly investigated using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), and UV–Visible Spectroscopy. XRD analysis confirmed the crystalline nature of the samples, indicating a preferential growth orientation along the c-axis. Raman spectra validated the successful incorporation of graphene within the ZnO matrix, along with characteristic phonon modes of ZnO. SEM images revealed densely packed, vertically aligned hexagonal nanorods with uniform morphology. A comparative gas sensing study was conducted to evaluate the NO₂ detection performance of pristine ZnO and rGO-ZnO nanorod films under ambient conditions. The rGO-ZnO sensor exhibited significantly enhanced sensitivity and faster response towards NO₂ gas. The rGO-ZnO exhibits 110% sensitivity at 4 ppm of NO₂, whereas at the same concentration, undoped ZnO shows only 7%. These findings suggest that rGO incorporation into ZnO nanorods substantially improves NO₂ gas sensing performance, making them promising candidates for low-concentration gas detection applications.