Water-dispersible silver nanoparticles-decorated carbon nanomaterials: synthesis and enhanced antibacterial activity
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In recent years, a growing number of outbreak of infectious diseases have emerged all over the world. The outbreak of re-emerging and emerging infectious diseases is a considerable burden on global economies and public health. Nano-antimicrobials have been studied as an effective solution for the prevention of infectious diseases. In this work, we demonstrated a modified photochemical approach for the preparation of carbon nanotubes–silver nanoparticles (CNTs–Ag) and graphene oxide–silver nanoparticles (GO–Ag) nanocomposites, which can be stably dispersible in aqueous solution. The formation of silver nanoparticles (Ag-NPs) on the functionalized CNTs and GO nanosheets was analyzed by X-ray diffraction, transmission electron microscopy, Raman spectroscopy and UV–Vis measurements. These analyses indicated that the average particle sizes of Ag-NPs deposited on GO/CNTs nanostructures were ~6–7 nm with nearly uniform size distribution. Moreover, these nanocomposites were found to exhibit enhanced antibacterial activity against two strains of infectious bacteria including Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacteria as compared to bare Ag-NPs. Our obtained studies showed a high potential of GO–Ag and CNTs–Ag nanocomposites as effective and long-term disinfection solution to eliminate infectious bacterial pathogens.
KeywordsAntibacterial Activity Graphene Oxide Silver Nanoparticles Carbon Nanostructures Antibacterial Performance
This work was supported by Vietnam’s National Foundation for Science and Technology Development (NAFOSTED) through a fundamental research project (code: 103.44-2012.60). The authors would like to thank Prof. P.T. Huy at AIST for providing GO samples. Also, the technical supports for TEM and biological measurements at National Institute of Hygiene and Epidemiology are acknowledged.
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