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Issue 3, 2020
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Antibacterial activity of an NIR-induced Zn ion release film

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Photothermal therapy originated from using 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 study, a bilayer film, consisting of GNRs as the inner layer and a polydopamine layer containing Zn element (PDA@Zn) as the outer layer, was deposited on the Ti surface. The results testified that all the GNR-modified surfaces had the same photothermal conversion efficiency. The Ti surface modified with GNR and PDA@Zn layers had better antibacterial activity against E. coli and S. aureus due to the GNR-induced photothermal effect and the antibacterial Zn element. Moreover, the accelerated release of Zn ions from the PDA@Zn layer was attributed to the GNR-induced high temperature under the NIR irradiation, which caused the concentration of Zn ions to be high enough to kill the surrounding bacteria. This study illustrates that a composite surface possessing both the contact and heat-responsive antibacterial property was constructed on titanium for potential clinical applications.

Graphical abstract: Antibacterial activity of an NIR-induced Zn ion release film

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Supplementary files

Article information

13 Oct 2019
30 Nov 2019
First published
02 Dec 2019

J. Mater. Chem. B, 2020,8, 406-415
Article type

Antibacterial activity of an NIR-induced Zn ion release film

T. Yang, D. Wang and X. Liu, J. Mater. Chem. B, 2020, 8, 406
DOI: 10.1039/C9TB02258A

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