In situ synthesis of silver nanoparticles uniformly distributed on polydopamine-coated silk fibers for antibacterial application

Fabrication of silver nanoparticles (AgNPs)-modified silk for antibacterial application is one of the hottest topics in the textile material research. However, the utilization of a polymer as both 3-dimensional matrix and reductant for the in - situ synthesis of AgNPs on silk fibers has not been realized. In this work, a facile, efficient and green approach was developed to in - situ grow AgNPs on the polydopamine (PDA)-functionalized silk. AgNPs with the size of 30–90   nm were uniformly deposited on the silk fiber surface with the PDA coating layer as a reduction reagent. The AgNPs exhibit excellent face-centered cubic crystalline structures. The bacterial growth curve and inhibition zone assays clearly demonstrate the antibacterial properties of the functionalized silk. Both high Ag + release level and long-time release profile were observed for the as-prepared AgNPs–PDA-coated silk, indicating the high-density loading of AgNPs and the possible long-term antibacterial effects . This work may provide a new method for the preparation of AgNPs-functionalized silk with antibacterial activity for the clothing and textile industry.