sno2:au/carbon quantum dots nanocomposites: synthesis, characterization, and antibacterial activity

Carbon quantum dots-based nanostructures have been found more attention in recent years. in this study, au-doped tin oxide/carbon quantum dots (au:sno2/carbon quantum dots) nanocomposites was prepared via simple and friendly to the environment route. the obtained results from x-ray diffraction (xrd) analysis, fourier-transform infrared spectroscopy (ft-ir), scanning electron microscopy (sem), energy dispersive spectroscopy (eds) analysis, photoluminescence spectroscopy (pl), and ultra violet-visible (uv-vis) spectroscopy showed the formation of the pure and regular shape of au:sno2/ carbon quantum dots. then, prepared au:sno2/ carbon quantum dots was utilized for the testing of antibacterial activity using aspergillus niger,, bacillus subtilis, candida albicans, escherichia coli, klebsiella pneumonia, pseudomonas aeruginosa, salmonella paratyphi-a serotype, shigella dysenteriae, staphylococcus aureus, staphylococcus epidermidis, and streptococcus pyogenes. the modified sample showed significant improvement against tested bacteria. the best antibacterial activity was observed in au:sno2/ carbon quantum dots against pseudomonas aeruginosa with mic values of 62.5 μg/ml. the obtained results demonstrate au:sno2/ carbon quantum dots nanocomposites are highly suitable as an antibacterial agent against both gram-negative and gram-positive bacteria.