All Spectra were acquired on thin films prepared on Kevley substrates and measured under ambient conditions. Spectral resolution: 4 cm-1. 
512 scans, Mir-infrared spectral region from 900 to 3900 cm-1. All biocides were prepared in methanol, apart from Linezolid (ethanol) and silver sulfadiazine and (pvp-) iodine (in ultrapure water) before deposition. 
