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<p>The optical emission characteristics of CeO₂ nanowires with different average diameters were examined using photoluminescence spectroscopy, in order to explore the potential effects of quantum confinement on the band gap transition as the diameter of the nanowires decreased. First, no significant shift in the band gap energy was detected, which suggests that quantum confinement may not play a role within the size range investigated. On the other hand, we observed four distinct lower-energy defect emission bands that showed a clear dependence on the diameter of the nanowires, indicating that size reduction affects structural or electronic defects. Among these emissions related to defects, only one photoluminescence band was sensitive to the temperature of thermal treatment, indicating the importance of annealing in altering specific defect states strongly depends on their physical origin. We proposed a defect formation model that aligns well with the optical emission spectra we obtained from all samples and is consistent with an oxygen vacancy diffusion theoretical model.</p>

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The influence of diameter on the light emission properties of cerium oxide nanowires obtained by electrospinning

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Joyce de M. Leão,
  • Luis F. Gil,
  • Fabiano Yokaichiya,
  • Ney Mattoso,
  • Emilson R. Viana,
  • Cyro K. Saul,
  • Evaldo Ribeiro

摘要

The optical emission characteristics of CeO₂ nanowires with different average diameters were examined using photoluminescence spectroscopy, in order to explore the potential effects of quantum confinement on the band gap transition as the diameter of the nanowires decreased. First, no significant shift in the band gap energy was detected, which suggests that quantum confinement may not play a role within the size range investigated. On the other hand, we observed four distinct lower-energy defect emission bands that showed a clear dependence on the diameter of the nanowires, indicating that size reduction affects structural or electronic defects. Among these emissions related to defects, only one photoluminescence band was sensitive to the temperature of thermal treatment, indicating the importance of annealing in altering specific defect states strongly depends on their physical origin. We proposed a defect formation model that aligns well with the optical emission spectra we obtained from all samples and is consistent with an oxygen vacancy diffusion theoretical model.