Exploring the Control in Antibacterial Activity of Silver Triangular Nanoplates by Surface Coating Modulation

Abstract

In the present work, the synthesis and characterization of silver triangular nanoplates (AgNTs) and their silica coating composites are reported. Engineering control on the surface coating has demonstrated the possibility to modulate the antibacterial effect. Several AgNTs coated nanomaterials, such as PVP (Polyvinylpyrrolidone) and MHA (16-mercaptohexadecanoic acid) as stable organic coating system, and uniform silica coating (5 nm) of triangular silver nanoplates (AgNTs) have been prepared and fully characterized. The antibacterial properties of the systems reported, organic (MHA) and inorganic (amine and carboxylic terminated SiO2) coating nanocomposites, have been tested on Gram-positive and Gram-negative bacteria strains. We have observed that the AgNTs organic coating explored improved antimicrobial properties when compared to other spherical silver colloids found in the literature. We have also found that compact inorganic silica coating decreases the antimicrobial effect, but does not cancel it. In addition, the effect of surface charge in AgNTs@Si seems to play a key role towards S. aureus ATCC 25923 bacteria, obtaining MICs/MBCs values compared to the AgNTs with organic coating.