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<p>The research study exposes the consequence of annealing temperature and ZrO<sub>2</sub>–ZnO composition ratio on co-precipitation-derived nanocomposites with emphasis on their potential for optoelectronic and photocatalytic applications. Nanocomposites with varying molar ratios of ZrO<sub>2</sub> and ZnO were synthesized and annealed at temperatures in the range 673 to 1173&#xa0;K. XRD analysis revealed a crystalline transition of zirconia from tetragonal to monoclinic phase with increasing annealing temperature, along with the persistence of the hexagonal wurtzite structure of ZnO. Higher ZrO<sub>2</sub> content modified the surface morphology of ZnO, reducing nanoparticle aggregation and enhancing the effective surface area. EDS confirmed the targeted stoichiometry, whilst XPS demonstrated systematic binding energy shifts with increasing ZnO concentration. The increasing amount of ZnO in the nanocomposite is found to be altered the optical bandgap from 5.2 to 3.03&#xa0;eV. Photoluminescent studies further revealed the formation of defects and modifications in electronic excitation levels, as a function of annealing temperature. Correlated colour temperature (CCT), varying from 4000 to 6000&#xa0;K, and colour purity calculations conducted on the prepared nanocomposites, suggests potential for optoelectronic applications attributed to improved charge separation and surface properties. The synthesized composites demonstrated notable photocatalytic activity, with a maximum degradation efficiency and rate constant up to 77% and 0.00715&#xa0;min⁻<sup>1</sup> respectively.</p>

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Annealing assisted and composition modulated tailoring of ZrO2–ZnO nanocomposites for optoelectronic and photocatalytic applications

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Lini Jose,
  • S. Sankar,
  • J. S. Muhammed Shajin,
  • K. M. Nissamudeen

摘要

The research study exposes the consequence of annealing temperature and ZrO2–ZnO composition ratio on co-precipitation-derived nanocomposites with emphasis on their potential for optoelectronic and photocatalytic applications. Nanocomposites with varying molar ratios of ZrO2 and ZnO were synthesized and annealed at temperatures in the range 673 to 1173 K. XRD analysis revealed a crystalline transition of zirconia from tetragonal to monoclinic phase with increasing annealing temperature, along with the persistence of the hexagonal wurtzite structure of ZnO. Higher ZrO2 content modified the surface morphology of ZnO, reducing nanoparticle aggregation and enhancing the effective surface area. EDS confirmed the targeted stoichiometry, whilst XPS demonstrated systematic binding energy shifts with increasing ZnO concentration. The increasing amount of ZnO in the nanocomposite is found to be altered the optical bandgap from 5.2 to 3.03 eV. Photoluminescent studies further revealed the formation of defects and modifications in electronic excitation levels, as a function of annealing temperature. Correlated colour temperature (CCT), varying from 4000 to 6000 K, and colour purity calculations conducted on the prepared nanocomposites, suggests potential for optoelectronic applications attributed to improved charge separation and surface properties. The synthesized composites demonstrated notable photocatalytic activity, with a maximum degradation efficiency and rate constant up to 77% and 0.00715 min⁻1 respectively.