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<p>In this investigation, gold-doped titanium dioxide (Au-doped TiO₂) nanostructures have been fabricated using DC reactive magnetron co-sputtering with varying Ar: O₂ mixing ratios. The films’ structural, morphological and optical properties were examined by XRD, FTIR, FE-SEM and UV-visible methods. The metallic Au NPs produced peaks that corresponds to the TiO<sub>2</sub>-rutile phase and TiO<sub>2</sub>-anatase phase. FTIR spectra confirm the presence of hydroxyl groups and vibrational groups such as TiO and TiO-Ti. Optical measurements indicating a narrowing of the band gap and redshift of the absorption edge from 390&#xa0;nm to 430&#xa0;nm, TiO₂ films that were doped with gold were found to be effective in the photocatalytic degradation of p-nitrophenol. Study shows enhancement of photocatalytic activity due to the synergistic effects of localized surface plasmon resonance (LSPR) from metallic Au nanoparticles and interfacial state-mediated visible-light absorption, along with effective separation of charges.</p>

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Visible-light-driven photocatalytic degradation of p-nitrophenol using Au-doped TiO₂ thin films fabricated by DC reactive co-sputtering

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Esraa A. Al-Oubidy,
  • Mohammed A. Hameed,
  • Tawfiq S. Mahdi

摘要

In this investigation, gold-doped titanium dioxide (Au-doped TiO₂) nanostructures have been fabricated using DC reactive magnetron co-sputtering with varying Ar: O₂ mixing ratios. The films’ structural, morphological and optical properties were examined by XRD, FTIR, FE-SEM and UV-visible methods. The metallic Au NPs produced peaks that corresponds to the TiO2-rutile phase and TiO2-anatase phase. FTIR spectra confirm the presence of hydroxyl groups and vibrational groups such as TiO and TiO-Ti. Optical measurements indicating a narrowing of the band gap and redshift of the absorption edge from 390 nm to 430 nm, TiO₂ films that were doped with gold were found to be effective in the photocatalytic degradation of p-nitrophenol. Study shows enhancement of photocatalytic activity due to the synergistic effects of localized surface plasmon resonance (LSPR) from metallic Au nanoparticles and interfacial state-mediated visible-light absorption, along with effective separation of charges.