Fabrication of hierarchical structured graphene oxide-Fe₃O₄ hybrid nanosheets and Ag nanoparticles bimetallic composite coated silk fibers through self-assembly

抄録

We report a facile and environmentally friendly approach to prepare hierarchical structured graphene oxide (GO)-Fe₃O₄ nanoparticles (NPs) hybrid nanosheets and Ag nanoparticles bimetallic composite coated silk fiber nanocomposites through hyperbranched poly(amide-amine) (HBPAA)-directed self-assembly technology. In such structure, HBPAA served as a molecular “double-sided tape” not only gluing AgNPs to the fiber surfaces but also adhering GO- Fe₃O₄NPs to the surfaces of HBPAA/AgNPs to form the protective layer of HBPAA/AgNPs and then improve the biosecurity and durability. The prepared silk fiber nanocomposites can be served as a small household magnet and have efficient, safe and durable antibacterial activities. These nanocomposites could be easily recycled without a decrease in their antibacterial activities due to the synergistic effects between the AgNPs and GO-Fe₃O₄NPs hybrid nanosheets with large amounts of active sites.