Antibacterial activity of the NIR-induced Zn ions release film
Photothermal therapy originated from the gold nanorods (GNRs) and near-infrared (NIR) irradiation has been widely used in the antibacterial field. Zn element exhibits antimicrobial activity against various bacterial and fungal strains. In this work, the bilayer film was deposited on the Ti surface including the inner gold nanorods layer and the outer polydopamine layer containing Zn element (PDA@Zn). Results testified that all the GNRs-modified surfaces had the same photothermal conversion efficiency. Ti surface modified with GNRs and PDA@Zn layers had better antibacterial activity against E. coli and S. aureus due to the GNRs-induced photothermal effect and antibacterial Zn element. Moreover, the accelerated release of Zn ions from the PDA@Zn layer was attributed to the GNRs-induced high temperature under the NIR irradiation, which caused the concentration of Zn ions to be large enough to kill the surrounding bacteria. This work illustrates a composite surface possessing both the contact and heat-responsiveness antibacterial property was constructed on titanium for potential application in clinic.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry B HOT Papers