Preparation and Antibacterial Properties of Nanosilver-Loaded Polydopamine Coated Multi-Wall Carbon Nanotubes
Abstract: On the basis of characteristic of dopamine self-polymerization under slightly alkaline solution, polydopamine (PDA) coated multi-wall carbon nanotubes (MWCNTs) was prepared. Then, the pre-synthesis polydopamine (PDA) layer was utilized as a nanoscale guide to form uniform Ag nanoparticles (Ag NPs) on the surface of PDA-MWCNTs. In this system, chitosan (CS) played a role of protective agent and stabilizer and through the reduction and adsorption action of the PDA layer, PDA coated MWCNTs/Ag NPs/CS composites (CS/PDA-MWCNTs/Ag) were prepared by in-situ chemical reduction. The structure and nature of CS/PDA-MWCNTs/Ag composites were investigated with TEM and XRD. Analysis indicated that the adhesive rate of Ag NPs by in-situ chemical reduction method was superior to liquid phase reducing method. The resulting composites had an efficient broad-spectrum of antibacterial activity against both Gram-negative and Gram- positive bacteria, which further confirmed the synergistic effect of CS and Ag NPs can enhance the antimicrobial properties of hybrid materials.
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