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<p>Un-doped NiCr<sub>2</sub>O<sub>4</sub> and Sn-V co-doped NiCr<sub>2</sub>O<sub>4</sub> nanoparticles with varying doping concentrations (2%, 3%, and 4%) were synthesized and characterized using various analytical techniques. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase spinel structure with slight peak shifts indicating successful incorporation of Sn and V into the NiCr<sub>2</sub>O<sub>4</sub> lattice. The crystallite size was found to slightly decrease with increasing dopant concentration due to lattice distortion. Diffuse Reflectance Spectroscopy (DRS) revealed a gradual reduction in the optical band gap from pure NiCr<sub>2</sub>O<sub>4</sub> (∼2.54&#xa0;eV) to 4% doped samples (∼2.42&#xa0;eV), indicating enhanced visible-light absorption. FTIR spectra displayed characteristic vibrational bands of metal-oxygen stretching modes, with minor shifts upon doping due to lattice modification. Photoluminescence (PL) studies showed a quenching effect in the doped samples, suggesting reduced electron-hole recombination and improved charge separation. SEM images revealed that all samples exhibited agglomerated but well-dispersed nano spherical morphology, with smaller particle sizes observed in higher dopant levels. Photocatalytic application was studied upon degrading rhodamine B (RhB) and methylene blue (MB) textile dyes. 3wt% Sn-V: NiCr<sub>2</sub>O<sub>4</sub> degrades 84% of RhB and 88% of MB in 100&#xa0;min.</p>

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Sn4+:V5+ co-doping effects on the luminescence and photocatalytic properties of NiCr2O4 ceramics synthesized via sol-gel technique

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • R. Shanthi,
  • R. Santhakumari,
  • N. Radha,
  • T. U. Jeevitha,
  • K. Sheikdavood,
  • A. Sharmila,
  • M. John Abel

摘要

Un-doped NiCr2O4 and Sn-V co-doped NiCr2O4 nanoparticles with varying doping concentrations (2%, 3%, and 4%) were synthesized and characterized using various analytical techniques. X-ray diffraction (XRD) analysis confirmed the formation of a single-phase spinel structure with slight peak shifts indicating successful incorporation of Sn and V into the NiCr2O4 lattice. The crystallite size was found to slightly decrease with increasing dopant concentration due to lattice distortion. Diffuse Reflectance Spectroscopy (DRS) revealed a gradual reduction in the optical band gap from pure NiCr2O4 (∼2.54 eV) to 4% doped samples (∼2.42 eV), indicating enhanced visible-light absorption. FTIR spectra displayed characteristic vibrational bands of metal-oxygen stretching modes, with minor shifts upon doping due to lattice modification. Photoluminescence (PL) studies showed a quenching effect in the doped samples, suggesting reduced electron-hole recombination and improved charge separation. SEM images revealed that all samples exhibited agglomerated but well-dispersed nano spherical morphology, with smaller particle sizes observed in higher dopant levels. Photocatalytic application was studied upon degrading rhodamine B (RhB) and methylene blue (MB) textile dyes. 3wt% Sn-V: NiCr2O4 degrades 84% of RhB and 88% of MB in 100 min.