Accelerated bacterial reduction on Ag–TaN compared with Ag–ZrN and Ag–TiN surfaces

Abstract

a b s t r a c tAg-TaN sputtered on polyester (PES) accelerated >6 times the bacterial inactivation kinetics compared to TaN-PES under actinic light irradiation. Direct current pulsed magnetron sputtering (DCP) was used to sputter Ag-TaN-PES and TaN-PES. Complete bacterial reduction by Ag-TaN occurred within 20 min compared to Ag-TiN (100 min) and Ag-ZrN (90 min). The co-sputtering of Ag and Ta on PES was carried out in an Ar/N 2 10% atmosphere. By ion-coupled plasma mass-spectrometry (ICP-MS) a reduced Ag-release was observed for Ag-TaN samples compared to Ag-PES samples within the disinfection period. The redox catalysis by the Ag-species during the bacterial disinfection was followed by X-ray photoelectron spectroscopy (XPS). A bacterial reduction mechanism is suggested consistent with the experimental findings. The nitride films were characterized by surface science methods.

Quasi-Instantaneous Bacterial Inactivation on Cu–Ag Nanoparticulate 3D Catheters in the Dark and Under Light: Mechanism and Dynamics

“…Therefore, the interest of the present study is warranted. The bacterial inactivation kinetics reported hereby presents an improvement compared to two types of films reported recently by our laboratory: (a) TiO 2 /Cu films inactivating E. coli within ∼10 min and (b) Ag-TaN films inactivating E. coli within ∼20 min …”

“…The bacterial inactivation kinetics reported hereby presents an improvement compared to two types of films reported recently by our laboratory: (a) TiO 2 /Cu films inactivating E. coli within ∼10 min 19 and (b) Ag-TaN films inactivating E. coli within ∼20 min. 37 ■ RESULTS AND DISCUSSION Cu, Ag, Cu−Ag Coating Thickness, and Determination of Sample Composition. Figure 1a shows the nominal thickness calibration of Cu−Ag sputtered films on nonporous Si-wafers by profilometry.…”

Understanding the Preferred Crystal Orientation of Sputtered Silver in Ar/N2 Atmosphere: A Microstructure Investigation

“…Noble metal silver (Ag) has excellent characteristics, such as low electrical resistivity, high thermal conduction, high reflectivity in visible and infrared regions, and great weldable and antimicrobial properties [1][2][3]. Silver and corresponding composites are widely used in the fields of electronics, aerospace, medical instruments, etc.…”

Innovative Ti1–xNbxN–Ag Films Inducing Bacterial Disinfection by Visible Light/Thermal Treatment

“…Highly pathogenic biofilms can strongly adhere to textiles, glass surfaces, prostheses, catheters, dental implants, and metal plates. − Ag film morphology and grain size have been addressed in Ag films leading to bacterial inactivation . More advanced and effective antibacterial surfaces are a subject of timely interest, and in this direction silver and copper nanoparticles have recently been addressed in studies reporting antibacterial surfaces/films, − carbon nanotubes, , diamond-like carbon, , metal oxides, − nitrides, − and oxynitrides. − …”