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<p>CuCr<sub>2</sub>O<sub>4</sub> and Fe-substituted CuCr<sub>2</sub>O<sub>4</sub> nanoparticles were synthesized via the sol–gel method, and their structural, morphological and optical/electrical properties were investigated using X-ray diffraction (XRD) and terahertz spectroscopy. XRD analysis revealed that the parent compound exhibits a tetragonal spinel phase, while Fe substitution induces a phase transition towards the cubic spinel structure. Dynamic light scattering measurements indicated a decrease in average particle size with increasing Fe content. Additionally, zeta potential measurements showed a reduction in surface charge upon Fe substitution, suggesting changes in colloidal stability or surface chemistry. Terahertz spectroscopy revealed that increasing Fe content led to a progressive increase in absorption coefficient, refractive index and dielectric constant across the series. As a result, the electrical conductivity of the nanoparticles increased with Fe substitution, likely due to enhanced charge carrier mobility or polaron hopping facilitated by the Fe dopants.</p>

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Exploring the terahertz response of Fe-doped CuCr2O4 nanoparticles

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • K Yadagiri,
  • M Nagaraju,
  • A K Chaudhary,
  • D Haranath

摘要

CuCr2O4 and Fe-substituted CuCr2O4 nanoparticles were synthesized via the sol–gel method, and their structural, morphological and optical/electrical properties were investigated using X-ray diffraction (XRD) and terahertz spectroscopy. XRD analysis revealed that the parent compound exhibits a tetragonal spinel phase, while Fe substitution induces a phase transition towards the cubic spinel structure. Dynamic light scattering measurements indicated a decrease in average particle size with increasing Fe content. Additionally, zeta potential measurements showed a reduction in surface charge upon Fe substitution, suggesting changes in colloidal stability or surface chemistry. Terahertz spectroscopy revealed that increasing Fe content led to a progressive increase in absorption coefficient, refractive index and dielectric constant across the series. As a result, the electrical conductivity of the nanoparticles increased with Fe substitution, likely due to enhanced charge carrier mobility or polaron hopping facilitated by the Fe dopants.