Silver Nanoparticles Supported on TiO<sub>2</sub> and Their Antibacterial Properties: Effect of Surface Confinement and Nonexistence of Plasmon Resonance

Abstract

Ag/TiO 2 nanocomposites are usually regarded as an effective synergy for high antimicrobial performance under ultraviolet-visible light conditions. This study confirmed that the surface plasmon resonance of Ag NPs plays an important role in relation to the NPs size and consequently with the antibacterial effect of the nanocomposite. We observed that under visible light the reactivity of TiO 2 cannot be amplified when it is supporting Ag NPs that have an inactive photocatalytically surface. The results confirmed that the antimicrobial effectiveness of nanocomposite based on Ag NPs supported-TiO 2 is closely associated to the contact surface area and to the electronic performance of the noble metal.

Surface Modification of nTiO2/Ag Hybrid Nanoparticles Using Microwave-Assisted Polymerization in the Presence of Bis(2-hydroxyethyl) Terephthalate

“…Similar reports were made by Quiñones-Jurado et al [8], who found that the antimicrobial activity of the nTiO 2 /Ag is lower in S. aureus than in E. coli, associating this behavior with the composition of Gram (+) bacteria which provides greater protection when interacting with NPs. In the same sense, Kim et al [3] studied the antimicrobial activity of nAg in S. aureus and E. coli, finding that the Gram (+) bacteria S. aureus in contact with silver NPs are less susceptible, because of the protection conferred by peptidoglycan in the bacterial wall.…”

“…On the other hand, Seery et al [7] conducted similar work in which they increased the concentration of Ag NPs deposited in TiO 2 NPs finding further degradation of rhodamine B, by increasing the concentration of Ag NPs. Meanwhile, Quiñones-Jurado et al [8] synthesized Ag NPs supported on TiO 2 NPs and evaluated the bactericidal activity in three different bacteria (E. coli, S. aureus, and Salmonella sp.) finding less sensitivity for S. aureus, Gram (+).…”

Template Based Synthesis of Plasmonic Ag‐modified TiO2/SnO2 Nanotubes with Enhanced Photostability for Efficient Visible‐Light Photocatalytic H2 Evolution and RhB Degradation

“…The Ag nanoparticles on TiO 2 / SnO 2 nanotubes represent the other Raman peaks at 102, 259, and 735 cm À 1 . [42] For the 0.2 Ag-TiO 2 /SnO 2 nanotubes, very weak signals related to Ag nanoparticles are found for the samples because of the relatively low concentration of Ag loaded onto the surface and its weak Raman scattering. It can be clearly seen that the peak intensities of TiO 2 and SnO 2 can be decreased with increasing Ag content, but the position of the peaks would remain while being broadened.…”

Nanocomposite polyacrylonitrile filaments with titanium dioxide and silver nanoparticles for multifunctionality

“…TiO 2 nanoparticles are reported to improve UV protection [33], antistatic [35], self-cleaning [36–38], antibacterial [39], hydrophilic [40], ultra-hydrophobic [41], wrinkle resistance [42], water adsorption, and dyeability [43,44] properties. In particular, anatase TiO 2 is commonly used for the elimination of microbiological and toxic contaminants in filtration applications and for self-cleaning surface applications [45]. On the other hand, AgNPs are reported to be strong and broad-spectrum antibacterial agents against diverse species [46].…”