| Summary: | Currently there is a strong demand for novel protective materials with efficient antibacterial properties. Nanocomposite materials loaded with photo-thermally active nanoparticles can offer promising opportunities due to the local increase of temperature upon near-infrared (NIR) light exposure capable of eradicating bacteria. In this work, we fabricated antibacterial films obtained by spraying on glass slides aqueous solutions of polymers, containing highly photo-thermally active gold nanostars (GNS) or Prussian Blue (PB) nanoparticles. Under NIR light irradiation with low intensities (0.35 W/cm<sup>2</sup>) these films demonstrated a pronounced photo-thermal effect: Δ<i>T<sub>max</sub></i> up to 26.4 °C for the GNS-containing films and Δ<i>T<sub>max</sub></i> up to 45.8 °C for the PB-containing films. In the latter case, such a local temperature increase demonstrated a remarkable effect on a Gram-negative strain (<i>P. aeruginosa</i>) killing (84% of dead bacteria), and a promising effect on a Gram-positive strain (<i>S. aureus</i>) eradication (69% of dead bacteria). The fabricated films are promising prototypes for further development of lightweight surfaces with efficient antibacterial action that can be remotely activated on demand.
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