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<p>This study explores the synthesis of gold (Au) and zinc oxide (ZnO) nanoparticles (NPs) via pulsed laser ablation (PLA) to assess their antibacterial and photocatalytic performance. Five distinct formulations were prepared: pure Au NPs, pure ZnO NPs, and three Au/ZnO nanocomposites with varying mixing ratios. Comprehensive characterization was performed using TEM, XRD, FT-IR, and UV–Vis spectroscopy. Among all samples, the 25/75 Au/ZnO nanocomposite demonstrated the highest antibacterial efficiency, primarily due to the synergistic effects of Zn<sup>2</sup>⁺ ion release, reactive oxygen species (ROS) generation, and electrostatic interactions with bacterial membranes. This formulation also exhibited superior photocatalytic activity, achieving 92% degradation of methylene blue (MB) dye within 60&#xa0;min. The enhanced performance is attributed to effective charge separation, increased surface reactivity, and improved light absorption resulting from the interplay between ZnO’s semiconducting properties and the surface plasmon resonance (SPR) effect of Au. These findings underscore the potential of compositionally optimized Au/ZnO nanocomposites in biomedical and environmental applications.</p>

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Compositional Tuning of Au/ZnO Nanoparticles for Superior Antibacterial and Photocatalytic Activities

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Maysam T. Al-Obaidi,
  • Taha M. Rashid,
  • Muntadher I. Rahmah

摘要

This study explores the synthesis of gold (Au) and zinc oxide (ZnO) nanoparticles (NPs) via pulsed laser ablation (PLA) to assess their antibacterial and photocatalytic performance. Five distinct formulations were prepared: pure Au NPs, pure ZnO NPs, and three Au/ZnO nanocomposites with varying mixing ratios. Comprehensive characterization was performed using TEM, XRD, FT-IR, and UV–Vis spectroscopy. Among all samples, the 25/75 Au/ZnO nanocomposite demonstrated the highest antibacterial efficiency, primarily due to the synergistic effects of Zn2⁺ ion release, reactive oxygen species (ROS) generation, and electrostatic interactions with bacterial membranes. This formulation also exhibited superior photocatalytic activity, achieving 92% degradation of methylene blue (MB) dye within 60 min. The enhanced performance is attributed to effective charge separation, increased surface reactivity, and improved light absorption resulting from the interplay between ZnO’s semiconducting properties and the surface plasmon resonance (SPR) effect of Au. These findings underscore the potential of compositionally optimized Au/ZnO nanocomposites in biomedical and environmental applications.