Antibacterial activity of monolayer nanoparticulate Ag_N-(titanium-oxo-alkoxy) coatings

¹ Laboratoire des Sciences des Procédés et des Matériaux, CNRS, Université Paris 13, Sorbonne Paris Cité, 93430 Villetaneuse, France
² N. N. Semenov Institute of Chemical Physics, RAS, 119071 Moscow, Russia
³ Institute of Problem of Chemical Physics, RAS, 142432 Chernogolovka, Russia
⁴ Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow Region  
⁵ Institute of Molecular Genetics, RAS, 123182 Moscow, Russia
⁶ State Research Institute of Genetics and Selection of Industrial Microorganisms, 117545 Moscow, Russia
⁷ École de Biologie Industrielle (EBI), 13 boulevard de l’HAUTIL, 95092 Cergy Pontoise, France

^a Corresponding author: r.azouani@hubebi.com

Received: 8 April 2015
Accepted: 14 November 2015

Abstract

A comparative evaluation of the antibacterial effect of silver in the form of nanoparticles and Ag⁺ ions was performed. Silver nanoparticulate coatings of stable and reproducible morphology were prepared on monolayer size-selected titanium-oxo-alkoxy nanoparticles deposited on glass substrates. The coatings exhibit a strong antibacterial activity towards Escherichia coli K12 AB 1157 and suppress biofilms formation. This activity is mainly related to the Ag⁺ ions release into aqueous solutions in dark. The deposited silver mass ~1 μg.cm^-2 is smaller compared to that of Ag⁺ ions and nanoparticles generally reported for inhibiting Escherichia coli. The synergetic effect of the deposited nanoparticles and Ag⁺ ions can be suggested.