Laser-induced graphene papers with tunable microstructures as antibacterial agents

摘要: Laser-induced graphene (LIG) has recently been attracting attention as a highly efficient method to process antimicrobial materials with scalable sizes and tunable properties. In this work, freestanding graphene papers are systematically investigated to study their process- and structure-dependent antibacterial activities against both Gram-positive and Gram-negative species. In addition to microscopy analyses for qualitative discussion of live and dead cells, a colony counting assay is applied to precisely quantify the loss of viability of bacteria treated by various laser-induced graphene papers (LIGPs) with tunable microstructures. Remarkably, the 1.25 W-processed LIGPs (LIGP-1.25 W) exhibit the highest reduction rate of 92.8% for Escherichia coli (E. coli) and 95.2% for Staphylococcus aureus (S. aureus), compared with LIGPs processed under 0.75 W (LIGP-0.75 W) and 1.75 W (LIGP-1.75 W). In addition to proving …