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<p>Many recent studies address marine biofouling, a costly issue caused by organism accumulation on marine structures, and the need for effective antifouling coatings with reduced ecological impact. Copper-based antifouling paints dominate the market due to broad-spectrum bioactivity but pose environmental risks from copper ion leaching, leading to stricter regulations. Copper-based nanomaterials, especially bimetallic silver-copper (AgCu) nanoparticles supported on silica (SiO<sub>2</sub>), offer promising alternatives due to enhanced antimicrobial performance and controlled ion release. This study investigates how the sub-microstructure of AgCu nanoparticles affects their antimicrobial activity. Two types of AgCu/SiO<sub>2</sub> nanocomposites (NC) with distinct sub-microstructures—homophase (alloyed) and heterophase (multiphase)—were prepared via a modified polyol method using different solvents. Tests on marine microbial communities showed that the heterophase NC exhibits stronger antibacterial activity at a lower concentration (250&#xa0;µg mL<sup>− 1</sup>) than the homophase NC (500&#xa0;µg⋅mL<sup>− 1</sup>), attributed to higher metal ion release and increased reactive oxygen species generation. The heterophase NC also exhibited more stable silver ion release, while copper ion behavior was complex and environmentally dependent. This work highlights the sub-microstructure’s impact on antibacterial efficacy and environmental behavior, promoting targeted design of antifouling coatings balancing performance and ecological safety in marine applications.</p>

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Structural Effect and Antimicrobial Performance of AgCu Bimetallic Nanoparticles against the Marine Microbial Community

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Dinh Trung Do,
  • Quoc Vinh Tran,
  • Ngoc Tuyen Nguyen,
  • Le Thi My Hiep,
  • Ngoc Bao Tri Pham,
  • Thu Trang Ta,
  • Quy Hieu Doan,
  • Tran Duong Vu,
  • Thi Thu Thao Bui,
  • Le Thai Duy,
  • Vinh Quang Dang,
  • Cong Khanh Tran

摘要

Many recent studies address marine biofouling, a costly issue caused by organism accumulation on marine structures, and the need for effective antifouling coatings with reduced ecological impact. Copper-based antifouling paints dominate the market due to broad-spectrum bioactivity but pose environmental risks from copper ion leaching, leading to stricter regulations. Copper-based nanomaterials, especially bimetallic silver-copper (AgCu) nanoparticles supported on silica (SiO2), offer promising alternatives due to enhanced antimicrobial performance and controlled ion release. This study investigates how the sub-microstructure of AgCu nanoparticles affects their antimicrobial activity. Two types of AgCu/SiO2 nanocomposites (NC) with distinct sub-microstructures—homophase (alloyed) and heterophase (multiphase)—were prepared via a modified polyol method using different solvents. Tests on marine microbial communities showed that the heterophase NC exhibits stronger antibacterial activity at a lower concentration (250 µg mL− 1) than the homophase NC (500 µg⋅mL− 1), attributed to higher metal ion release and increased reactive oxygen species generation. The heterophase NC also exhibited more stable silver ion release, while copper ion behavior was complex and environmentally dependent. This work highlights the sub-microstructure’s impact on antibacterial efficacy and environmental behavior, promoting targeted design of antifouling coatings balancing performance and ecological safety in marine applications.