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<p>Pure ceria and zinc (0.2, 0.4, 0.6, and 0.8 wt%) doped nano ceria particles were synthesised using a chemical co-precipitation method. The samples underwent calcination at 600&#xa0;°C, and their physical properties were analysed using XRD, UV-visible spectroscopy, FTIR, photoluminescence, FESEM, HRTEM, and EDAX analysis. X-ray diffraction (XRD) analysis provides the cubic phase and other microstructural properties, strain, lattice contraction and expansion in pure ceria and Zn-doped nanoceria. The crystallite size derived from the Scherrer equation was determined to be 14.2 nm for pure ceria, which exhibited a decrement with escalating Zn doping up to 4 wt%, thereby signifying the effective incorporation of Zn within the nanoceria lattice. Conversely, an increase in crystallite size was observed beyond the 4 wt% threshold (specifically at 6 and 8 wt%). The observed blue-shifted broad envelope absorption band in UV-Vis-NIR spectra aligns closely with the morphological analysis. The band observed between 450–500 cm<sup>−1</sup> in FTIR indicates the stretching vibration of Ce–O and Zn–O bond. Defect luminescence was observed via PL spectra, with intensity variation correlating to the incorporation of defects. The spherical morphology of the samples, both in aggregated and poly-dispersed states, was observed through FESEM micrographs. The SAED pattern obtained from HRTEM was employed to examine the size and shape of the Zn doped nanoceria that are consistent with the XRD diffractogram. The sample 4&#xa0;wt% Zn doped nanoceria was examined for dielectric characteristics such as tangent loss, AC conductivity and dielectric constant. At room temperature, impedance spectroscopy was used with applied frequencies between 50 Hz and 50 MHz. The incorporation of Zn<sup>2+</sup> into the Cerium Oxide matrix led to significant interfacial polarisation and an increased dielectric constant, while the dielectric loss exhibited a shift in the opposite direction. The AC electrical conductivity of Zn-doped nano Ceria samples increased in relation to the concentration of available charge carriers.</p>

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Effect of Oxygen Vacancies on Structural, Morphological, Optical and Di-electric Properties of Co-precipitated Zn Doped Ceria (CeO2) Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • G. Magesh,
  • A. P. Arun,
  • Rajasekar Kannan,
  • G. Prasad,
  • E. Ranjith Kumar,
  • V. Rajendran

摘要

Pure ceria and zinc (0.2, 0.4, 0.6, and 0.8 wt%) doped nano ceria particles were synthesised using a chemical co-precipitation method. The samples underwent calcination at 600 °C, and their physical properties were analysed using XRD, UV-visible spectroscopy, FTIR, photoluminescence, FESEM, HRTEM, and EDAX analysis. X-ray diffraction (XRD) analysis provides the cubic phase and other microstructural properties, strain, lattice contraction and expansion in pure ceria and Zn-doped nanoceria. The crystallite size derived from the Scherrer equation was determined to be 14.2 nm for pure ceria, which exhibited a decrement with escalating Zn doping up to 4 wt%, thereby signifying the effective incorporation of Zn within the nanoceria lattice. Conversely, an increase in crystallite size was observed beyond the 4 wt% threshold (specifically at 6 and 8 wt%). The observed blue-shifted broad envelope absorption band in UV-Vis-NIR spectra aligns closely with the morphological analysis. The band observed between 450–500 cm−1 in FTIR indicates the stretching vibration of Ce–O and Zn–O bond. Defect luminescence was observed via PL spectra, with intensity variation correlating to the incorporation of defects. The spherical morphology of the samples, both in aggregated and poly-dispersed states, was observed through FESEM micrographs. The SAED pattern obtained from HRTEM was employed to examine the size and shape of the Zn doped nanoceria that are consistent with the XRD diffractogram. The sample 4 wt% Zn doped nanoceria was examined for dielectric characteristics such as tangent loss, AC conductivity and dielectric constant. At room temperature, impedance spectroscopy was used with applied frequencies between 50 Hz and 50 MHz. The incorporation of Zn2+ into the Cerium Oxide matrix led to significant interfacial polarisation and an increased dielectric constant, while the dielectric loss exhibited a shift in the opposite direction. The AC electrical conductivity of Zn-doped nano Ceria samples increased in relation to the concentration of available charge carriers.