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<p>Surface modification of medical and surgical instruments is a promising strategy to reduce bacterial and viral infection rate and improve patient safety during surgical procedures. Several metal-based nanocomposites have been extensively reported as a promising candidate for antimicrobial application. This study examined the antibacterial properties of stainless steel coated with various nanostructured thin films (TaN-Ag, TaN-Ag/Zn, TaN-Ag/Au). The coatings, which contained Ag, Zn, and Au nanoparticles within a tantalum nitride matrix, were applied to 316L stainless steel using DC cylindrical magnetron co-sputtering and subsequently annealed at 400&#xa0;°C for 5&#xa0;min. The coatings were characterized through x-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy. The self-cleaning and hydrophobic properties were evaluated via contact angle tests, while antibacterial efficacy was tested against Escherichia coli (E. coli) under visible light. Results indicated that the TaN-Ag/Zn coating exhibited superior hydrophobicity and antibacterial activity, achieving a contact angle of approximately 105° and a 73% reduction in E. coli after 6 hours. In comparison, TaN-Ag and TaN-Ag/Au coatings showed antibacterial activities of 62% and 51%, respectively. The enhanced antibacterial performance of TaN-Ag/Zn is attributed to its higher surface roughness and lower surface energy.</p> Graphical Abstract <p></p>

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Co-Sputtering TaN-Ag/M (M: Zn or Au) Coatings on 316L Stainless Steel: Hydrophobicity, Topography, and Antibacterial Activity

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Sara Moghimian,
  • Parvaneh Sangpour,
  • Tahereh Ghanbaryrad,
  • Seyed Majid Borghei

摘要

Surface modification of medical and surgical instruments is a promising strategy to reduce bacterial and viral infection rate and improve patient safety during surgical procedures. Several metal-based nanocomposites have been extensively reported as a promising candidate for antimicrobial application. This study examined the antibacterial properties of stainless steel coated with various nanostructured thin films (TaN-Ag, TaN-Ag/Zn, TaN-Ag/Au). The coatings, which contained Ag, Zn, and Au nanoparticles within a tantalum nitride matrix, were applied to 316L stainless steel using DC cylindrical magnetron co-sputtering and subsequently annealed at 400 °C for 5 min. The coatings were characterized through x-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy. The self-cleaning and hydrophobic properties were evaluated via contact angle tests, while antibacterial efficacy was tested against Escherichia coli (E. coli) under visible light. Results indicated that the TaN-Ag/Zn coating exhibited superior hydrophobicity and antibacterial activity, achieving a contact angle of approximately 105° and a 73% reduction in E. coli after 6 hours. In comparison, TaN-Ag and TaN-Ag/Au coatings showed antibacterial activities of 62% and 51%, respectively. The enhanced antibacterial performance of TaN-Ag/Zn is attributed to its higher surface roughness and lower surface energy.

Graphical Abstract