Abstract
A layer of silver nanoplates, specifically synthesized with the desired localized surface plasmon resonance (LSPR) features, was grafted on amino-functionalized bulk glass surfaces to impart a double antibacterial action: (i) the well-known, long-term antibacterial effect based on the release of Ag+; (ii) an “on demand” action which can be switched on by the use of photo-thermal properties of silver nano-objects. Irradiation of these samples with a laser having a wavelength falling into the so called “therapeutic window” of the near infrared region allows the reinforcement, in the timescale of minutes, of the classical antibacterial effect of silver nanoparticles. We demonstrate how using the two actions allows for almost complete elimination of the population of two bacterial strains of representative Gram-positive and Gram-negative bacteria.
Highlights
Functional nanomaterials are increasingly finding wide success in several research fields devoted to human well-being
We opted for a synthetic route based on a seed-growth method, but avoided any surfactant or polymer in an attempt to produce the nanoplates in absence of any potentially
We opted for a synthetic route based on a seed-growth method, but avoided any surfactant or polymer in an attempt to produce the nanoplates in absence of any potentially harmful reactant, reactant, as as well well to to pursue pursue an an economic economic and and “green”
Summary
Functional nanomaterials are increasingly finding wide success in several research fields devoted to human well-being. The use of anisotropic silver nanoparticles has started to raise a greater interest, driven by the fact that localized surface plasmon resonance (LSPR) properties of noble metal nano-objects are strongly dependent on size and shape, and that this feature can be exploited to obtain nano-objects having a wide range of colors, a feature which is exploitable in the coating of textile fibers to obtain colorful antibacterial fabrics [12,13]. We used a monolayer of GNSs grafted on bulk glass samples [20] to have a model of an active surface Laser irradiation of this monolayer, exploiting the NIR LSPR absorption of GNSs, yielded an efficient photo-thermal conversion causing hyperthermia, which efficiently kills bacteria cells in Staphylococcus aureus biofilms. Glass with citrate-capped Ag nanoplates (GLASS-PEI-TRI) samples
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