Antibacterial Activity of Polypropylene Meshes for Hernioplasty with Ag and (Ag,Cu) Coatings Deposited via Magnetron Sputtering

This article compares the antibacterial properties of single-layer (Ag) and two-layer (Ag,Cu) coatings deposited onto a polypropylene mesh (endoprostheses for hernioplasty) in various gaseous environments (argon or nitrogen) via magnetron sputtering. The microstructure and elemental composition of the coatings were studied via SEM and TEM. The antimicrobial activity of sterile samples was investigated using the Staphylococcus aureus strain. To prevent the overheating of the polymer samples during the coating process, it is advisable to carry out pulse processing (the total coating formation time is divided into cycles of switching the magnetron on and off for equal periods). All the samples, with both single- and double-layer coatings, exhibited good antibacterial properties; however, the Cu–Ag coating enhanced the antimicrobial effect, increasing it from 97.00 to 99.97%. The glow-discharge plasma etching of the samples with a double-layer coating led to the mixing of the copper and silver layers and an increase in the surface copper content, though this did not affect the antibacterial properties of the samples.