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<p>Magnesium oxide (MgO) nanoparticles (NPs) were synthesized using a microwave-assisted green approach with <i>Trachyspermum ammi</i> (<i>T. ammi</i>) leaf extract as reducing and stabilizing agents. The method enables rapid, eco-friendly synthesis with improved phase purity. X-ray diffraction (XRD) patterns specify the presence of single-phase cubic MgO of good crystallinity with an average crystallite size of 15&#xa0;nm. Fourier transform infrared (FTIR) spectra show a distinct Mg–O stretching vibration in the range of 451–871&#xa0;cm<sup>−1</sup>, along with residual plant-based functional groups that support the bio-assisted formation process. UV–Visible analysis reveals strong absorption in the ultraviolet region with a clear absorption edge, and the optical band gap is estimated to be 3.06&#xa0;eV. Photoluminescence (PL) spectrum illustrates the major emission peak centered at wavelength of about 485&#xa0;nm corresponding to defect states in MgO lattice. Dielectric constant is maximum at low frequencies and progressively drops with increase in frequencies as a result of polarization, and dielectric loss is minimal at high frequencies. The combined structural, optical, and dielectric results indicate that <i>T. ammi</i>-derived MgO nanoparticles are suitable for optoelectronic and photonic applications.</p>

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Green-synthesized MgO nanoparticles using Trachyspermum ammi: band gap engineering and dielectric response for photonic applications

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • R. Zema Ferin,
  • N. Jesmin,
  • S. Pugazhendhi,
  • T. Gunachitra,
  • M. Vimalan,
  • M. Gulam Mohamed

摘要

Magnesium oxide (MgO) nanoparticles (NPs) were synthesized using a microwave-assisted green approach with Trachyspermum ammi (T. ammi) leaf extract as reducing and stabilizing agents. The method enables rapid, eco-friendly synthesis with improved phase purity. X-ray diffraction (XRD) patterns specify the presence of single-phase cubic MgO of good crystallinity with an average crystallite size of 15 nm. Fourier transform infrared (FTIR) spectra show a distinct Mg–O stretching vibration in the range of 451–871 cm−1, along with residual plant-based functional groups that support the bio-assisted formation process. UV–Visible analysis reveals strong absorption in the ultraviolet region with a clear absorption edge, and the optical band gap is estimated to be 3.06 eV. Photoluminescence (PL) spectrum illustrates the major emission peak centered at wavelength of about 485 nm corresponding to defect states in MgO lattice. Dielectric constant is maximum at low frequencies and progressively drops with increase in frequencies as a result of polarization, and dielectric loss is minimal at high frequencies. The combined structural, optical, and dielectric results indicate that T. ammi-derived MgO nanoparticles are suitable for optoelectronic and photonic applications.