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Silver-doped laser-induced graphene for potent surface antibacterial activity and anti-biofilm action

Gupta, Abhishek, Holoidovsky, Lara, Thamaraiselvan, Chidambaram, Thakur, Amit K., Singh, Swatantra P., Meijler, Michael M., Arnusch, Christopher J.
Chemical communications 2019 v.55 no.48 pp. 6890-6893
antibacterial properties, bacteria, biofilm, chemical reactions, graphene, nanosilver, polymers, rural areas, silver, silver nitrate, toxicity, water pollution
Previously, laser-induced graphene (LIG) coated surfaces were shown to resist biofilm growth, although the material was not strongly antibacterial. Here, we show LIG surfaces doped with silver nanoparticles (Ag⁰ or AgNPs) as highly antibacterial surfaces. Starting from AgNO₃ polyethersulfone (PES) polymer substrates, silver nanoparticles between 5–10 nm were generated in situ during the lasing process and stably embedded in the fibrous and porous structure of LIG in a single step. These silver doped LIG (Ag@LIG) surfaces were highly toxic to bacteria via a mechanism of both Ag⁺ ion release and possible surface toxicity of the AgNPs. The added antibacterial function of Ag-nanoparticles expands the functionality of LIG coated surfaces and might lead to highly effective point of use/entry devices in rural areas or in disaster situations with contaminated water sources.