Antibacterial properties of silicon nanoparticles

The antibacterial properties of silicon nanoparticles with Gram-positive and Gram-negative bacteria were demonstrated. The nanoparticles were prepared with laser ablation in various liquids (distilled water, isopropyl alcohol) using a nanosecond laser. Optical and scanning electron microscopy methods were used for the sample characterization. The presence of singlet oxygen and other reactive oxygen species on the surface of the silicon nanoparticles, leading to oxidative damage to bacterial membranes and further death of the bacteria, was considered a possible mechanism of this antibacterial action. (letter)