Keywords: roll-to-roll, silver nanoparticles, paper, antibacterial
Summary:There has been a surge in antimicrobial re-sistance to conventional antibiotics. These drug-resistant bacteria cause healthcare associated infections. Nanoparticles have shown promise in controlling drug-resistant bacteria, especially when used together with antibiotics. Nanoparticle production techniques have continuously evolved over the years. Substrate properties often limit the possible production techniques and, for example; until recently, it has been difficult to incorporate nanoparticles into paper. Recently, there has been emphasis on environmentally friendly manufacturing processes. Chemical reduction of a precursor in the presence of paper changes the bulk properties of paper, which may limit intended end-use. In this study, we present a novel technique for incorporating silver nanoparticles into paper surface using a flame pyrolysis procedure known as Liquid Flame Spray (LFS). Papers precoated with mineral pigments and plastic are used as substrates. Silver nanoparticles were analyzed using SEM and XPS measurements. Results show a homogeneous monolayer of silver nanoparticles on the surface of paper, which demonstrated antibacterial properties against E. coli. Paper precoated with plastic showed more nanoparticles on the surface compared to pigment coated paper samples except for polyethylene-precoated paper. The results demonstrate a dry synthesis approach for depositing silver nanoparticles directly onto paper surface in a process, which produces no effluents. The production technique used herein is up scalable for industrial production of antibacterial paper.