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<p>Nickel cobalt oxide (NiCo<sub>2</sub>O<sub>4</sub>) nanoflakes are synthesized using solvothermal method and systematically investigated to correlate structural, optical and photocatalytic characteristics. The powder X-ray diffraction patterns confirm the formation of a phase pure cubic spinel phase structure of NiCo<sub>2</sub>O<sub>4</sub> with an average crystallite size of 16&#xa0;nm. Fourier transform infrared spectra (FTIR) indicate a prominent band near 651 and 556&#xa0;cm<sup>−1</sup> which is attributed to Co–O and Ni–O stretching vibrations and confirmed spinel lattice formation. Field-emission scanning electron microscopy (FE-SEM) reveals a morphology of interconnected nanoscale network which supports efficient charge transport. Energy-dispersive X-ray spectroscopy (EDX) spectra and elemental mapping verify uniform distribution of Ni, Co and O. UV–Visible explores a strong ultraviolet absorption 370&#xa0;nm with an optical bandgap of 1.70&#xa0;eV favouring photo-induced charge excitation. Photoluminescence measurements indicate reduced emission peak at 368&#xa0;nm in the ultraviolet region, suggesting suppressed electron–hole recombination and improved charge separation, which enhances photocatalytic activity with a high degradation efficiency of 97.2% under UV irradiation. Collectively, the results of the study demonstrate that NiCo<sub>2</sub>O<sub>4</sub> nanoflakes represent a prospective candidate for multifunctional material suitable for advanced photocatalytic, electrocatalytic and optoelectronic applications.</p>

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Enhanced photoluminescence, optical and photocatalytic performance of NiCo2O4 nanoflakes for photonic applications

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • A. K. Aslam Tabrez,
  • N. Jesmin,
  • Muhammad Faizan,
  • Mohammad Ahmad Wadaan,
  • Sandhanasamy Devanesan,
  • S. Tamilselvan,
  • M. Vimalan

摘要

Nickel cobalt oxide (NiCo2O4) nanoflakes are synthesized using solvothermal method and systematically investigated to correlate structural, optical and photocatalytic characteristics. The powder X-ray diffraction patterns confirm the formation of a phase pure cubic spinel phase structure of NiCo2O4 with an average crystallite size of 16 nm. Fourier transform infrared spectra (FTIR) indicate a prominent band near 651 and 556 cm−1 which is attributed to Co–O and Ni–O stretching vibrations and confirmed spinel lattice formation. Field-emission scanning electron microscopy (FE-SEM) reveals a morphology of interconnected nanoscale network which supports efficient charge transport. Energy-dispersive X-ray spectroscopy (EDX) spectra and elemental mapping verify uniform distribution of Ni, Co and O. UV–Visible explores a strong ultraviolet absorption 370 nm with an optical bandgap of 1.70 eV favouring photo-induced charge excitation. Photoluminescence measurements indicate reduced emission peak at 368 nm in the ultraviolet region, suggesting suppressed electron–hole recombination and improved charge separation, which enhances photocatalytic activity with a high degradation efficiency of 97.2% under UV irradiation. Collectively, the results of the study demonstrate that NiCo2O4 nanoflakes represent a prospective candidate for multifunctional material suitable for advanced photocatalytic, electrocatalytic and optoelectronic applications.