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<p>The structural, optical, photocatalytic and dielectric properties of Cd<sub>0.40</sub>Mn<sub>0.60</sub>ZnO<sub>2</sub> annealed nanocomposites prepared by Hydrothermal and subsequently annealed at temperatures between 200&#xa0;°C and 600&#xa0;°C. The particle size, crystallite size, and inter-plane separation were all enlarged with increased T<sub>ann</sub> at 600&#xa0;°C and electrical dielectric loss increased. The specific surface area and photocatalytic activity were maximized, obtaining in this case a rate of degradation of 2 × 10<sup>-4</sup>s<sup>-1</sup> at 400&#xa0;°C. The lowest band gap = 1.55&#xa0;eV was observed at 400&#xa0;°C signifying enhanced optical absorption. The optical and dielectric properties exhibited a non-monotonic behavior: absorbance, optical dielectric loss, carrier density, dielectric constant, ac conductivity and Fill-factor, increased to the maximum values at 300&#xa0;°C followed by a decrease. The dielectric constant (3.22), single and dispersion energies (10.58&#xa0;eV and 23.33&#xa0;eV), impedance (3.25–10.70 MΩ) and series resistance (14.3 MΩ) were maximum at 500&#xa0;°C. From loss, modulus, and impedance curves, relaxation times were calculated by being 82.71 µs, 0.69–10.62 µs, and 15.92–40.94 µs. Two successive semicircles were identified in Cole-Cole plots for the composites after annealing in the range 200–500&#xa0;°C. Results show composites annealed at 200–400&#xa0;°C can be utilized for solar cell, supercapacitor, telecommunications, and water purification applications while those annealed at 500–600&#xa0;°C are more suitable for a high frequency, nonlinear optical, and high-power antenna applications.</p>

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Comprehensive study of optical, photocatalytic and dielectric properties of Cd0.40Mn0.60ZnO2 annealed nanocomposites

  • 期刊论文

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  • 发表日期：

    2025年5月3日

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  • Mansour Mohamed,
  • A. Sedky,
  • Abdullah F. Al-Naim,
  • Abdullah Almohammedi,
  • N. Afify

摘要

The structural, optical, photocatalytic and dielectric properties of Cd0.40Mn0.60ZnO2 annealed nanocomposites prepared by Hydrothermal and subsequently annealed at temperatures between 200 °C and 600 °C. The particle size, crystallite size, and inter-plane separation were all enlarged with increased Tann at 600 °C and electrical dielectric loss increased. The specific surface area and photocatalytic activity were maximized, obtaining in this case a rate of degradation of 2 × 10-4s-1 at 400 °C. The lowest band gap = 1.55 eV was observed at 400 °C signifying enhanced optical absorption. The optical and dielectric properties exhibited a non-monotonic behavior: absorbance, optical dielectric loss, carrier density, dielectric constant, ac conductivity and Fill-factor, increased to the maximum values at 300 °C followed by a decrease. The dielectric constant (3.22), single and dispersion energies (10.58 eV and 23.33 eV), impedance (3.25–10.70 MΩ) and series resistance (14.3 MΩ) were maximum at 500 °C. From loss, modulus, and impedance curves, relaxation times were calculated by being 82.71 µs, 0.69–10.62 µs, and 15.92–40.94 µs. Two successive semicircles were identified in Cole-Cole plots for the composites after annealing in the range 200–500 °C. Results show composites annealed at 200–400 °C can be utilized for solar cell, supercapacitor, telecommunications, and water purification applications while those annealed at 500–600 °C are more suitable for a high frequency, nonlinear optical, and high-power antenna applications.