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<p>The pristine anatase titanium dioxide (TiO<sub>2</sub>) and transition metal (i.e. Cu and Co) co–doped anatase titanium dioxide nanoparticles (Ti<sub>0.988</sub>Cu<sub>0.002</sub>Co<sub>0.01</sub>O<sub>2</sub>) were synthesized using sol–gel auto–combustion technique. Structural, optical and dielectric properties have been studied to understand the effect of dopants across TiO<sub>2</sub> lattice. X–ray diffraction (XRD) and Rietveld refinements confirm the formation of tetragonal structure having <i>I4</i><sub><i>1</i></sub><i>/amd</i> space group, and crystallite size for co–doped TiO<sub>2</sub> nanoparticles falls ~12.68 nm which has been further verified by Raman spectroscopy. UV visible spectroscopy was performed to estimate the band gap energy that gets reduced from ~3.2 eV for TiO<sub>2</sub> to ~1.7 eV for co–doped TiO<sub>2</sub> nanoparticles. Dielectric constant, dielectric loss and ac conductivity for co–doped TiO<sub>2</sub> sample are explained in terms of crystallite size, related grain boundaries and their nature.</p> Graphical Abstract <p></p>

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Influence of copper and cobalt ions co–doping on structural, optical and dielectric properties of nanostructured anatase titanium dioxide

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Yogita Verma,
  • Puneet Negi,
  • Ruhit Jyoti Konwar,
  • Hemaunt Kumar,
  • Gagandeep Kaur,
  • Priyanka Rani,
  • Shailja,
  • Anchal Sharma,
  • Gursimran Kaur,
  • Apexa Maru,
  • Himanshu Dadhich,
  • Keval Gadani,
  • N. A. Shah,
  • P. S. Solanki

摘要

The pristine anatase titanium dioxide (TiO2) and transition metal (i.e. Cu and Co) co–doped anatase titanium dioxide nanoparticles (Ti0.988Cu0.002Co0.01O2) were synthesized using sol–gel auto–combustion technique. Structural, optical and dielectric properties have been studied to understand the effect of dopants across TiO2 lattice. X–ray diffraction (XRD) and Rietveld refinements confirm the formation of tetragonal structure having I41/amd space group, and crystallite size for co–doped TiO2 nanoparticles falls ~12.68 nm which has been further verified by Raman spectroscopy. UV visible spectroscopy was performed to estimate the band gap energy that gets reduced from ~3.2 eV for TiO2 to ~1.7 eV for co–doped TiO2 nanoparticles. Dielectric constant, dielectric loss and ac conductivity for co–doped TiO2 sample are explained in terms of crystallite size, related grain boundaries and their nature.

Graphical Abstract