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<p>In this study, gold nanoparticles were deposited on cerium oxide supports (Au/CeO₂) via a γ-radiolytic synthesis route, enabling fine control over nucleation, particle size, and metal dispersion. The kinetic study, based on pH evolution as a function of contact time, shows that precursor adsorption occurs primarily through ion exchange, with maximum efficiency around pH ≈ 9.5. After activation by γ-irradiation or calcination at 250&#xa0;°C, Au–Ce nanostructures of approximately 7&#xa0;nm were obtained (XRD), while SEM revealed a morphological evolution of the substrate. DFT calculations (GGA, VASP) identified two stable gold adsorption configurations on the CeO₂(110) surface, exhibiting similar energies (≈ − 1.1 to − 1.3&#xa0;eV), indicating comparable stability. The increased reactivity of this surface, due to its low coordination, promotes the multiplicity of active sites. The materials obtained exhibit notable antibacterial activity against <i>Staphylococcus aureus</i>,<i> Escherichia coli</i>,<i> Pseudomonas aeruginosa</i>, and <i>Bacillus bacteria</i>, with inhibition halos observed within 24&#xa0;h. These results confirm the effectiveness of γ-radiolytic synthesis to produce stable Au/CeO₂ nanostructures with strong antimicrobial potential.</p>

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Au/CeO₂ Nanoparticles Prepared by Ion-exchange Impregnation and γ Irradiation/Calcination Reduction: Structure and Antibacterial Activity

  • 期刊论文

  • 发表日期：

    2026年5月28日

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  • O. Djeghboub,
  • N. Ouafek,
  • D. Belfennache,
  • N. Keghouche,
  • R. Yekhlef,
  • Hamad M. Adress Hasan,
  • Hamdy A. Khatab,
  • Fatimah Abdulsayid,
  • Mohamed A. Ali

摘要

In this study, gold nanoparticles were deposited on cerium oxide supports (Au/CeO₂) via a γ-radiolytic synthesis route, enabling fine control over nucleation, particle size, and metal dispersion. The kinetic study, based on pH evolution as a function of contact time, shows that precursor adsorption occurs primarily through ion exchange, with maximum efficiency around pH ≈ 9.5. After activation by γ-irradiation or calcination at 250 °C, Au–Ce nanostructures of approximately 7 nm were obtained (XRD), while SEM revealed a morphological evolution of the substrate. DFT calculations (GGA, VASP) identified two stable gold adsorption configurations on the CeO₂(110) surface, exhibiting similar energies (≈ − 1.1 to − 1.3 eV), indicating comparable stability. The increased reactivity of this surface, due to its low coordination, promotes the multiplicity of active sites. The materials obtained exhibit notable antibacterial activity against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Bacillus bacteria, with inhibition halos observed within 24 h. These results confirm the effectiveness of γ-radiolytic synthesis to produce stable Au/CeO₂ nanostructures with strong antimicrobial potential.