3.1. Materials

Copper (0.5 mm thick, 99.99+%) and platinum sheets (0.25 mm thick, 99.999%) were purchased from Goodfellow Ltd. (Cambridge, UK) and cut into 2 × 1 cm pieces. Acetonitrile (ACN, anhydrous, 99.8%), tetrahydrofuran (THF, anhydrous, ≥99.9%, inhibitor-free), and tetraoctylammonium chloride (TOAC, AT reagent, ≥97.0%), were purchased from Sigma Aldrich (Milan, Italy). Aluminum Oxide (purum p.a., 99.7%), for the mechanical polishing of metallic sheets, was from Fluka Chemicals (Milan, Italy). Polyurethane foams were obtained from the industrial partner ME.RES. Meridionale Resine S.r.L (Avellino, Italy).

Escherichia coli ATCC 25922, Staphylococcus aureus FDA 209P (MSSA, with methicillin resistance 0.125 µg·mL⁻¹), and Kluyveromyces marxianus CBS 608, selected as target microorganisms for biological tests, were obtained from BioMérieux Italia S.p.A. (Florence, Italy), and reconstituted in nutrient broth (Agar Oxoid), purchased from Bio-Chemia (Bari, Italy), as the Plate Count Agar culture medium.