Journal
MATERIALS
Volume 14, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/ma14237301
Keywords
antibacterial; copper-gold-silver; magnetron sputtering
Categories
Funding
- Rector's Grant of the West Pomeranian University of Technology in Szczecin [ZUT/8/2021]
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One-hundred-nanometer films composed of silver, copper, and gold nanocrystallites were prepared and their antibacterial properties were quantitatively measured. The research showed significant oxidation of the copper films and ranked the antibacterial efficacy as Ag/Cu > Au/Cu > Cu. This suggests that such metallic surfaces could be utilized as contact-killing materials for better defense against bacteria and viruses.
One-hundred-nanometer films consisting of silver, copper, and gold nanocrystallites were prepared, and their antibacterial properties were quantitatively measured. The magnetron-sputtering method was used for the preparation of the metallic films over the glass plate. Single- and double-layer films were manufactured. The films were thoroughly characterized with the XRD, SEM, EDS, and XPS methods. The antibacterial activity of the samples was investigated. Gram-negative Escherichia coli, strain K12 ATCC 25922 (E. coli), and Gram-positive Staphylococcus epidermidis, ATCC 49461 (S. epidermidis), were used in the microbial tests. The crystallite size was about 30 nm in the cases of silver and gold and a few nanometers in the case of copper. Significant oxidation of the copper films was proven. The antibacterial efficacy of the tested samples followed the order: Ag/Cu > Au/Cu > Cu. It was concluded that such metallic surfaces may be applied as contact-killing materials for a more effective fight against bacteria and viruses.
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