Abstract
Bacterial infections cause severe threats to human health. Silver nanoparticles (AgNPs) are promising antibacterial materials, but still confront poor colloidal stability and uncontrollable silver ion (Ag+) release. Here, a dye template strategy based on tunable perylenediimide (PDI) self-assembly is presented for constructing novel silver nanohybrids with visible-light photocatalysis enhanced antibacterial effect. Ultrasmall AgNPs are grown on diversiform topological PDI self-assembly-templates via in situ reduction to yield silver nanohybrids, achieving stable AgNPs dispersion. The developed fiber-like nanohybrids (BF@AgNPs) are endowed with photocatalytic ability by PDI nanofiber templates. Upon visible-light irradiation, BF@AgNPs generate reactive oxygen species via photocatalytic reaction, facilitating the AgNPs degradation to release Ag+ and concurrently exerting photocatalytic damage to bacteria. Consequently, the visible-light photocatalysis enhanced antibacterial effect of BF@AgNPs against Staphylococcus aureus and Escherichia coli is achieved via synergetic Ag+ release and photocatalytic performance. This work not only provides a versatile molecular assembly strategy for developing new powerful antibacterial materials, but also opens up a new way for dye functionalization.
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