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<p>This study explores the structural, vibrational, optical, and photoluminescence properties of cobalt-doped Cu<sub>1-x</sub>Co<sub>x</sub>O (<i>x</i> = 0, 0.04, 0.08) nanoparticles synthesized via the sol–gel method. X-ray diffraction (XRD), refined through Rietveld analysis, confirmed the formation of a single-phase monoclinic structure (space group C2/c) without any detectable secondary phases. Fourier-transform infrared spectroscopy (FTIR) exhibited characteristic Cu–O stretching vibrations, validating the structural integrity and confirming Co-incorporation without disturbing the Cu–O bond environment. UV–vis diffuse reflectance spectroscopy (UV–vis DRS) showed a slight redshift in the absorption edge with increasing Co content, attributed to dopant-induced band structure modifications. Photoluminescence (PL) measurements at room temperature under 320&#xa0;nm excitation revealed reduced emission intensities in doped samples, indicating recombination suppression due to defect states introduced by Co<sup>2</sup>⁺ ions. CIE chromaticity coordinates positioned the emission in the violet-blue region, highlighting the suitability of these nanostructures for applications in optoelectronic and photonic devices.</p>

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Tailoring structural and optical features of Cu1-xCoxO nanoparticles via cobalt doping (0 ≤ x ≤ 0.08)

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Maheshwari Rahangdale,
  • Aditya Narayan Bhatt

摘要

This study explores the structural, vibrational, optical, and photoluminescence properties of cobalt-doped Cu1-xCoxO (x = 0, 0.04, 0.08) nanoparticles synthesized via the sol–gel method. X-ray diffraction (XRD), refined through Rietveld analysis, confirmed the formation of a single-phase monoclinic structure (space group C2/c) without any detectable secondary phases. Fourier-transform infrared spectroscopy (FTIR) exhibited characteristic Cu–O stretching vibrations, validating the structural integrity and confirming Co-incorporation without disturbing the Cu–O bond environment. UV–vis diffuse reflectance spectroscopy (UV–vis DRS) showed a slight redshift in the absorption edge with increasing Co content, attributed to dopant-induced band structure modifications. Photoluminescence (PL) measurements at room temperature under 320 nm excitation revealed reduced emission intensities in doped samples, indicating recombination suppression due to defect states introduced by Co2⁺ ions. CIE chromaticity coordinates positioned the emission in the violet-blue region, highlighting the suitability of these nanostructures for applications in optoelectronic and photonic devices.