Synthesis, Characterization, and Antibacterial Activity of Ag–TiO₂–Fe Composite Thin Films

Abstract

Ag–TiO2–Fe composite thin films with different Ag contents are deposited onto a glass substrate by a thermal evaporation method. TiO2, TiO2–Fe, and Ag–TiO2–Fe thin films are characterized by X‐ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), UV–vis–NIR spectroscopy, and photoluminescence (PL) to study the relation between their structural, morphological, optical, and luminescent properties with their antibacterial activities. XRD and Raman measurements show the formation of the anatase phase with increasing silver content in Ag–TiO2–Fe composite thin films. SEM images show the presence of silver in the metallic form. Optical measurements display a redshift in the optical absorption edge of TiO2–Fe and Ag–TiO2–Fe composite films with a decrease in the energy bandgap compared to pure TiO2. The antibacterial activity of the films against Escherichia coli is investigated both in the dark and under UV light. It is found that Ag plays a major role on the antibacterial efficiency in the dark. Ag–TiO2–Fe composite thin films exhibit a synergistic antibacterial effect under UV light, resulting an excellent antibacterial coating.

Elaboration and characterization of pure ZnO, Ag:ZnO and Ag-Fe:ZnO thin films: Effect of Ag and Ag-Fe doping on ZnO physical properties

“…During the evaporation process the ZnO powder changes state from solid to vapor, it is subdivided giving Zn atoms and oxygen O [9,20]. The Zn condenses on the substrate, while a large amount of oxygen pumped by the pumping group and the amount adsorbed by the layer formed will not be able to give an oxide phases.…”

Electrospun Ag‐dopedPA6multi‐stage structured nanofiber membrane with antibacterial property for oily particulate matters filtration

“…To avoid this potential threat, antibacterial agents are often added to prepare antibacterial air filtration materials. Inorganic compounds such as silver (Ag), [37][38][39] copper (Cu), 40,41 titanium dioxide (TiO 2 ), [42][43][44] and some natural plant extracts (e.g., melaleuca alternifolia extract, 45 bitter ginseng extract, 46 eucalyptus leaf extract, 47 mung bean protein, 48 etc.) have been applied in the production of antimicrobial materials.…”