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<p>Nickel oxide nanoparticles (NiO NPs) were prepared using the combustion method. X-ray diffraction (XRD) analysis confirmed that the nanoparticles have a cubic, polycrystalline structure. UV–visible absorption studies showed that their direct band gap decreases from 2.63&#xa0;eV to 1.6&#xa0;eV as the metal-to-fuel ratio increases, which enhances their ability to absorb visible light. The nanoparticles prepared with the optimized metal-to-fuel ratio demonstrated improved photocatalytic efficiency in breaking down Rhodamine-B dye, which also has antibacterial properties. Electrical studies revealed that long-range hopping of charge carriers causes the loss peak to shift to higher frequencies, and impedance analysis indicated a Debye-type relaxation mechanism. The Nyquist plot showed two semicircular arcs, suggesting that electrical conduction occurs through both the grains and grain boundaries. Additionally, the NiO nanoparticles exhibited a negative temperature coefficient of resistance, which is typical for semiconductors.</p>

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Eco-Friendly Synthesis of Nickel Oxide Nanoparticles: Multifunctional Dielectric, Antibacterial, and Photocatalytic Studies

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • H. S. Sumantha,
  • A. V. Ambika,
  • B. L. Suresha,
  • N. Navya

摘要

Nickel oxide nanoparticles (NiO NPs) were prepared using the combustion method. X-ray diffraction (XRD) analysis confirmed that the nanoparticles have a cubic, polycrystalline structure. UV–visible absorption studies showed that their direct band gap decreases from 2.63 eV to 1.6 eV as the metal-to-fuel ratio increases, which enhances their ability to absorb visible light. The nanoparticles prepared with the optimized metal-to-fuel ratio demonstrated improved photocatalytic efficiency in breaking down Rhodamine-B dye, which also has antibacterial properties. Electrical studies revealed that long-range hopping of charge carriers causes the loss peak to shift to higher frequencies, and impedance analysis indicated a Debye-type relaxation mechanism. The Nyquist plot showed two semicircular arcs, suggesting that electrical conduction occurs through both the grains and grain boundaries. Additionally, the NiO nanoparticles exhibited a negative temperature coefficient of resistance, which is typical for semiconductors.