Ag−TiO₂ Nanoparticle Codoped SiO₂ Films on ZrO₂ Barrier-Coated Glass Substrates with Antibacterial Activity in Ambient Condition

Abstract

Anatase TiO2 and Ag nanoparticles (NPs) codoped SiO2 films were prepared by the sol-gel method. Proportionate amounts of 3-(glycidoxypropyl)trimethoxysilane (GLYMO), tetraethylorthosilicate (TEOS) and 3-(methacryloxypropyl)trimethoxysilane (MEMO) derived inorganic-organic silica sol, commercially available dispersed anatase TiO2 NPs, and AgNO3 were used to prepare the sols. The films were prepared on ZrO2 (cubic) precoated soda-lime glass substrates by a single-dipping technique and heat-treated at 450 °C in air and H2/Ar atmosphere to obtain hard, relatively porous, and transparent coatings of thickness>600 nm. The ZrO2 barrier layer was previously applied on soda-lime glass to restrict the diffusion of Ag into the substrate. The Ag-TiO2 NPs incorporated SiO2 films were intense yellow in color and found to be fairly stable at ambient condition for several days under fluorescent light. These films show a considerable growth inhibition on contact with the gram negative bacteria E. coli.

Ag Nanoparticles Connected to the Surface of TiO2 Electrostatically for Antibacterial Photoinactivation Studies

“…The mixed phases of TiO 2 can usually retard the antibacterial as well as photocatalytic properties, and hence, it needs to consider the best catalytic phase of supportive TiO 2 materials for the synergetic enhancement of antibacterial activity. Similarly, Ag‐TiO 2 co‐doped SiO 2 films are prepared by dipping technique . The dipping technique usually results the nonuniform film formations as the nucleation particles diverting toward the bottom of the reaction mixture and hence nonuniform thickness of thin film results lower antibacterial activity due to the improper interactions with bacteria.…”

Self‐Cleaning and Antibacteric Ceramic Tile Surface

“…They found that Ag-doped titania coatings were significantly more photocatalytically and antimicrobial active than a titania coating. Mukhopadhyay et al 16 developed Ag-TiO 2 nanoparticles codoped SiO 2 films on crystalline ZrO 2 barrier-coated soda-lime glass substrates. The presence of presynthesized anatase nanoparticles helped the silver stabilization and improved the overall antibacterial activity.…”

“…They found that Ag‐doped titania coatings were significantly more photocatalytically and antimicrobial active than a titania coating. Mukhopadhyay et al . developed Ag–TiO 2 nanoparticles codoped SiO 2 films on crystalline ZrO 2 barrier‐coated soda‐lime glass substrates.…”

Cellulose-Based Nanofibril Composite Materials as a New Approach to Fight Bacterial Infections

“…TiO 2 has been shown to possess photoactivated bactericidal properties, especially under blue or UV light. Under ultraviolet irradiation, TiO 2 generates many ROS including hydroxl radicals, superoxide, and hydrogen peroxide that disrupt the cell walls of bacteria and inhibit their respiratory system ( Mukhopadhyay, Basak et al, 2010 ; Verdier, Coutand et al, 2014 ). Nevertheless, because of the fast rate of electron-hole recombination within TiO 2 , the ROS production is limited ( Nino-Martinez, Martinez-Castanon et al, 2008 ).…”