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<p>In this study, ZnFe<sub>2</sub>O<sub>4</sub> nanomaterials were synthesized via hydrothermal method, with different calcination temperatures. The crystallinity, morphology, phase composition and particle size were studied by using X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with an Energy Dispersive X-ray (EDX) detector, and transmission electron microscope (TEM), respectively which depicts ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles of cubic phase, purity and perfect stoichiometry of Zn:Fe:O. The optical properties, including band gap and absorption behaviour, were investigated using UV–vis absorption spectroscopy. The obtained optical band gap values, ranging between 2 and 3&#xa0;eV, fall within the expected visible-light absorption region. Also, the presence of functional groups and vibrational modes were identified by using Fourier Transform Infrared Spectroscopy (FTIR). The dielectric properties of ZnFe<sub>2</sub>O<sub>4</sub> nanomaterials were characterized by impedance analysis and a dielectric constant of 120 was obtained. The cole–cole plot reveals the semiconducting behaviour of ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles at higher frequency. This study provides insight into optimizing ZnFe<sub>2</sub>O<sub>4</sub> nanomaterials for supercapacitor applications.</p>

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Calcination temperature dependent structural, optical and dielectric properties of ZnFe2O4 nanomaterials synthesized by hydrothermal method

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Meghashree Vinod Shetter,
  • M. Uday Kumar,
  • R. Swetha,
  • B. V. Sahana,
  • Ramappa S. Kuri,
  • J. Anitha,
  • Latha Kumari

摘要

In this study, ZnFe2O4 nanomaterials were synthesized via hydrothermal method, with different calcination temperatures. The crystallinity, morphology, phase composition and particle size were studied by using X-ray diffraction (XRD), scanning electron microscope (SEM) equipped with an Energy Dispersive X-ray (EDX) detector, and transmission electron microscope (TEM), respectively which depicts ZnFe2O4 nanoparticles of cubic phase, purity and perfect stoichiometry of Zn:Fe:O. The optical properties, including band gap and absorption behaviour, were investigated using UV–vis absorption spectroscopy. The obtained optical band gap values, ranging between 2 and 3 eV, fall within the expected visible-light absorption region. Also, the presence of functional groups and vibrational modes were identified by using Fourier Transform Infrared Spectroscopy (FTIR). The dielectric properties of ZnFe2O4 nanomaterials were characterized by impedance analysis and a dielectric constant of 120 was obtained. The cole–cole plot reveals the semiconducting behaviour of ZnFe2O4 nanoparticles at higher frequency. This study provides insight into optimizing ZnFe2O4 nanomaterials for supercapacitor applications.