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    Nanocomposite Sprayed Films with Photo-Thermal Properties for Remote Bacteria Eradication

    Year: 2020

    Journal: Nanomaterials, Volume 10, APR

    Authors: Borzenkov, Mykola; Chirico, Giuseppe; Pallavicini, Piersandro; Sperandeo, Paola; Polissi, Alessandra; Dacarro, Giacomo; Doveri, Lavinia; Collini, Maddalena; Sironi, Laura; Bouzin, Margaux; D'Alfonso, Laura

    Keywords: nanoparticles; photo-thermal effect; nanocomposites; bacteria eradication

    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(2)) these films demonstrated a pronounced photo-thermal effect: AT., up to 26.4 degrees C for the GNS-containing films and Delta T-max up to 45.8 degrees C for the PB-containing films. In the latter case, such a local temperature increase demonstrated a remarkable effect on a Gram-negative strain (P. aeruginosa) killing (84% of dead bacteria), and a promising effect on a Gram-positive strain (S. aureus) 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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