Visible-light-responsive antibacterial activity of Au-incorporated TiO<sub>2</sub> layers formed on Ti-(0-10)at%Au alloys by air oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 30684386.
- Also identified by DOI 10.1002/jbm.a.36624.
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Abstract
Rutile TiO<sub>2</sub> layers were formed on substrates of Ti-(0-10)at%Au alloys by a simple process of air oxidation, and their antibacterial activities were evaluated under visible-light irradiation (λ ≥ 400 nm). Au was introduced into the TiO<sub>2</sub> layers on Ti-(1-10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au<sup>3+</sup> ions. The TiO<sub>2</sub> layers that formed on Ti-5at%Au and Ti-10at%Au alloys exhibited visible-light photocatalytic activity, that is, degradation of stearic acid and antibacterial activity against Escherichia coli. These visible-light activities were attributed to the surface plasmon resonance of metallic Au nanoparticles and the decrease in bandgap energy caused by dissolved Au<sup>3+</sup> ions. The formation of hydroxyl radicals observed under visible-light irradiation is attributable to antibacterial activity. From a cost perspective, a Ti-5at%Au alloy is more suitable as a substrate for the formation of a TiO<sub>2</sub> layer with antibacterial properties than a Ti-10at%Au alloy. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 991-1000, 2019.
Medical subject headings
- Air
- Alloys
- Anti-Bacterial Agents
- Gold
- Light
- Titanium