Visible-light-responsive antibacterial activity of Au-incorporated TiO                         2                          layers formed on Ti–(0–10)at%Au alloys by air oxidation

Takatoshi Ueda; Kyosuke Ueda; Koyu Ito; Kouetsu Ogasawara; Hiroyasu Kanetaka; Takayuki Mokudai; Yoshimi Niwano; Takayuki Narushima

doi:10.1002/jbm.a.36624

Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation

Takatoshi Ueda, Kyosuke Ueda, Koyu Ito, Kouetsu Ogasawara, Hiroyasu Kanetaka, Takayuki Mokudai, Yoshimi Niwano, Takayuki Narushima

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Rutile TiO ₂ 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 ₂ layers on Ti–(1–10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au ³⁺ ions. The TiO ₂ 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 ³⁺ 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 ₂ layer with antibacterial properties than a Ti–10at%Au alloy.

Original language	English
Pages (from-to)	991-1000
Number of pages	10
Journal	Journal of Biomedical Materials Research - Part A
Volume	107
Issue number	5
DOIs	https://doi.org/10.1002/jbm.a.36624
Publication status	Published - 2019 May

Keywords

Ti–Au alloy
antibacterial activity
radical formation
thermal oxidation
visible-light photocatalytic activity

ASJC Scopus subject areas

Ceramics and Composites
Biomaterials
Biomedical Engineering
Metals and Alloys

Access to Document

10.1002/jbm.a.36624

Cite this

Ueda, T., Ueda, K., Ito, K., Ogasawara, K., Kanetaka, H., Mokudai, T., Niwano, Y., & Narushima, T. (2019). Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation Journal of Biomedical Materials Research - Part A, 107(5), 991-1000. https://doi.org/10.1002/jbm.a.36624

Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation . / Ueda, Takatoshi; Ueda, Kyosuke ; Ito, Koyu et al.
In: Journal of Biomedical Materials Research - Part A, Vol. 107, No. 5, 05.2019, p. 991-1000.

Research output: Contribution to journal › Article › peer-review

Ueda, T, Ueda, K , Ito, K , Ogasawara, K , Kanetaka, H , Mokudai, T, Niwano, Y & Narushima, T 2019, ' Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation ', Journal of Biomedical Materials Research - Part A, vol. 107, no. 5, pp. 991-1000. https://doi.org/10.1002/jbm.a.36624

Ueda T, Ueda K , Ito K , Ogasawara K , Kanetaka H , Mokudai T et al. Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation Journal of Biomedical Materials Research - Part A. 2019 May;107(5):991-1000. doi: 10.1002/jbm.a.36624

Ueda, Takatoshi ; Ueda, Kyosuke ; Ito, Koyu et al. / Visible-light-responsive antibacterial activity of Au-incorporated TiO ₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation In: Journal of Biomedical Materials Research - Part A. 2019 ; Vol. 107, No. 5. pp. 991-1000.

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title = " Visible-light-responsive antibacterial activity of Au-incorporated TiO 2 layers formed on Ti–(0–10)at%Au alloys by air oxidation ",

abstract = " Rutile TiO 2 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 2 layers on Ti–(1–10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au 3+ ions. The TiO 2 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 3+ 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 2 layer with antibacterial properties than a Ti–10at%Au alloy.",

keywords = "Ti–Au alloy, antibacterial activity, radical formation, thermal oxidation, visible-light photocatalytic activity",

author = "Takatoshi Ueda and Kyosuke Ueda and Koyu Ito and Kouetsu Ogasawara and Hiroyasu Kanetaka and Takayuki Mokudai and Yoshimi Niwano and Takayuki Narushima",

note = "Funding Information: Correspondence to: T. Ueda; e-mail: takatoshi.ueda.r6@dc.tohoku.ac.jp Contract grant sponsor: Iketani Science and Technology Foundation Contract grant sponsor: Tohoku University Contract grant sponsor: Ministry of Education, Culture, Sports, Science and Technology; contract grant number: 25249094 Funding Information: The authors would like to thank Dr. T. Miyazaki, Dr. K. Kobayashi, Ms. K. Omura, and Ms. Y. Nakano of Tohoku University for their work on the TEM, TEM, XPS, and ICP-MS analyses, respectively. This study was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (No. 25249094), the “Interdepartmental Doctoral Degree Program for Multi-dimensional Materials Science Leaders” of Tohoku University, adopted as a “Program for Leading Graduate Schools, MEXT,” and by the Iketani Science and Technology Foundation. Publisher Copyright: {\textcopyright} 2019 Wiley Periodicals, Inc.",

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N2 - Rutile TiO 2 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 2 layers on Ti–(1–10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au 3+ ions. The TiO 2 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 3+ 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 2 layer with antibacterial properties than a Ti–10at%Au alloy.

AB - Rutile TiO 2 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 2 layers on Ti–(1–10)at%Au alloys and existed as both metallic Au nanoparticles and dissolved Au 3+ ions. The TiO 2 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 3+ 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 2 layer with antibacterial properties than a Ti–10at%Au alloy.

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