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<p>Nd-doped NiO nanoparticles (0.01–0.05&#xa0;mol%) were synthesized via a microwave-assisted method and evaluated for structural, optical, and catalytic properties. XRD analysis confirmed the formation of cubic NiO phase with crystallite size decreasing from 24.51&#xa0;nm to 17.60&#xa0;nm upon Nd incorporation. Lattice strain increased with dopant concentration, indicating defect generation within the host matrix. UV–Vis diffuse reflectance spectroscopy revealed a slight band gap modification attributed to quantum confinement and defect states. SEM and TEM analyses demonstrated nanoscale morphology with uniform dopant distribution confirmed by EDAX. The Nd-doped NiO catalyst exhibited improved catalytic activity toward benzaldehyde formation compared to undopedNiO, attributed to enhanced surface defects and oxygen vacancy-assisted oxidant activation. The catalyst demonstrated stable recyclability over multiple cycles without significant structural degradation. The study highlights the role of rare-earth-induced defect engineering in tuning NiO catalytic performance.</p>

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Tuning the Catalytic Activity of NiO via Neodymium Doping for Selective Benzaldehyde Formation

  • 期刊论文

  • 发表日期：

    2026年4月4日

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  • V. T. Geetha,
  • C. Selvakumar,
  • K. Hema,
  • V. Selvarani,
  • P. Kumutha

摘要

Nd-doped NiO nanoparticles (0.01–0.05 mol%) were synthesized via a microwave-assisted method and evaluated for structural, optical, and catalytic properties. XRD analysis confirmed the formation of cubic NiO phase with crystallite size decreasing from 24.51 nm to 17.60 nm upon Nd incorporation. Lattice strain increased with dopant concentration, indicating defect generation within the host matrix. UV–Vis diffuse reflectance spectroscopy revealed a slight band gap modification attributed to quantum confinement and defect states. SEM and TEM analyses demonstrated nanoscale morphology with uniform dopant distribution confirmed by EDAX. The Nd-doped NiO catalyst exhibited improved catalytic activity toward benzaldehyde formation compared to undopedNiO, attributed to enhanced surface defects and oxygen vacancy-assisted oxidant activation. The catalyst demonstrated stable recyclability over multiple cycles without significant structural degradation. The study highlights the role of rare-earth-induced defect engineering in tuning NiO catalytic performance.