(Springerlink, 2012) Urrutia Azcona, Aitor; Rivero Fuente, Pedro J.; Ruete Ibarrola, Leyre; Goicoechea Fernández, Javier; Matías Maestro, Ignacio; Arregui San Martín, Francisco Javier; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza; Institute of Smart Cities - ISC; Ingeniería; Ingeniaritza; Institute for Advanced Materials and Mathematics - INAMAT2
In this work, a novel single-stage process for in
situ synthesis of Ag nanoparticles (NPs) using the layer-bylayer (LbL) technique is presented. The Ag NPs were
formed into nanotextured coatings based on sequentially
adsorbed poly(allylamine hydrochloride) (PAH) and SiO2
NPs. Such highly porous surfaces have been used in the
fabrication of highly efficient ion release films for applications such as antibacterial coatings. In this approach, the
amino groups of the PAH acted as reducing agent and made
possible the in situ formation of the Ag NPs. This reduction
reaction occurred during the LbL process as the coating was
assembled, without any further step after the fabrication and
stabilization of the multilayer film. Biamminesilver nitrate
was used as the Ag+ ion source during the LbL process and it
was successfully reduced to Ag NPs. All coatings were tested
with gram-positive and gram-negative bacterial cultures of
Escherichia coli, Staphylococcus aureus, and Lactobacillus
delbrueckii showing an excellent antimicrobial behavior
against these types of bacteria (more than 99.9% of killing
efficiency in all cases).
