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

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

doi:10.1002/jbm.a.36624

Cited by 16 publications

(14 citation statements)

References 29 publications

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“…There have been many reports of additive doping to extend the limited photocatalytic effect of titania in the ultraviolet to visible light region [12,[15][16][17]. Especially, the combination of noble metals (gold or platinum, Au or Pt, respectively), which have excellent biological compatibility, and TiO 2 has been reported to show remarkable visible light photocatalytic activity [18][19][20][21][22]. In previous studies, we found four major absorbance peaks in the ultraviolet (UV), visible, and near infrared (NIR) regions and evaluated the visible-NIR laser-mediated release of antibacterial agent and the accompanying antibacterial activity of Au-coated TiO 2 nanotubes (NTs) [23,24].…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

et al. 2020

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This study aimed at evaluating the visible light mediated antimicrobial and osteogenic applications of noble metal, such as gold (Au) and platinum (Pt) coated titania (TiO2) nanotubes (NTs). In this study, the Au and Pt nanoparticles (NPs) were deposited on anodized 100 nm TiO2 NTs by ion plasma sputtering. The Au and Pt NPs were mainly deposited on the top surface layer of TiO2 NTs and showed light absorbance peaks around the 470 and 600 nm visible light region used in this study, as seen from the surface characterization. From the results of antibacterial activity test, Au and Pt NPs that were deposited on TiO2 NTs showed excellent antibacterial activity under 470 nm visible light irradiation due to the plasmonic photocatalysis based on the localized surface plasmon resonance effect of the Au and Pt NPs. In addition, alkaline phosphate activity test and quantitative real-time PCR assay of osteogenic related genes resulted that these NPs promoted the osteogenic functionality of human mesenchymal stem cells (hMSCs) under 600 nm visible light irradiation, because of the synergic effect of the photothermal scattering of noble metal nanoparticles and visible light low-level laser therapy (LLLT). Therefore, the combination of noble metal coated TiO2 NTs and visible light irradiation would be expected to perform permanent antibacterial activity without the need of an antibacterial agent besides promoting osteogenic functionality.

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Section: Introductionmentioning

confidence: 99%

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

et al. 2020

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“…Following the removal of duplicates and of irrelevant articles based on the title and abstract, a total of 29 publications were subjected to full-text review. As can be seen in Figure 1 , 20 articles were excluded due to the following reasons: 8 articles were excluded on the basis of their design ( 2 - 4 , 6 , 7 , 13 - 18 ), three due to the impossibility of full-text access ( 19 , 20 ), 5 because they did not investigate air and surface disinfection methods ( 1 , 21 - 25 ), and one because of the impossibility of accessing the results of the randomized clinical trial ( 26 ).…”

Section: Resultsmentioning

confidence: 99%

Disinfection of the air and surfaces in the dental clinic using hydroxyl radical (OH-) based technology: A systematic review

Paños-Crespo¹,

Traboulsi-Garet²,

Sánchez-Garcés³

et al. 2023

J Clin Exp Dent

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Background A systematic review was carried out to compare the disinfectant capacity of hydroxyl radicals (OH-) versus other products commonly used for disinfecting the air and surfaces. Material and Methods A literature search was made of the Cochrane Library, PubMed (MEDLINE) and Scopus databases. “In vitro” studies evaluating disinfection methods applicable to several surfaces and room air were included in the search. The search was carried out in April 2022, with no restrictions in terms of language or publication date. Results Of the 308 articles identified from the initial search, 8 were included for the quantitative analysis. All publications corresponded to experimental “in vitro” studies. Seven of them evaluated biocidal action against bacteria, and only two assessed activity against viral loads. The generation of contaminants secondary to application of the disinfectants was only analyzed in one of the studies, with the conclusion that the production of peroxyl radicals (RO2) derived from the oxidation of volatile organic compounds (VOCs) is greater when chemical surface disinfectants are used versus air disinfection systems. Conclusions The disinfection capacities of the currently available methods are similar, and none of them are able to replace the use of additional physical protection measures. Key words: Disinfection methods, hydroxyl radical, environment, surfaces, dentistry.

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“…In this work, we constructed a PPS by integrating a needle array corona discharge with a highly active Au/TiO 2 plasmonic nanocatalyst [26][27][28], and employed the PPS in the sterilization of the typical microorganism E. coli (ATCC 25922). It was demonstrated that the PPS can improve sterilization efficiency and suppress the generation of secondary pollutants relative to the corona discharge.…”

Section: Introductionmentioning

confidence: 99%

Improving plasma sterilization by constructing a plasma photocatalytic system with a needle array corona discharge and Au plasmonic nanocatalyst

Zhu¹,

Li²,

Gao³

et al. 2022

Plasma Sci. Technol.

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An efficient sterilization by plasma photocatalytic system (PPS) requires a strong synergism between plasma and photocatalyst to inactivate the microorganisms while suppressing the formation of secondary pollutants. Here we report that the PPS constructed by needle array corona discharge and Au/TiO2 plasmonic nanocatalyst could remarkably improve the sterilization of Escherichia coli (E. coli) and alleviate the formation of discharge pollutant of O3. At 6 kV, the combination of corona discharge and Au/TiO2 achieves sterilization efficiency of 100% within 5 mins exposure time. At 5 kV and exposure time of 8 mins, the presence of Au/TiO2 improves sterilization efficiency of the corona discharge from 73% to 91% and reduces O3 concentration from 0.38 ppm to 0.04 ppm, whereas the presence of TiO2 makes the sterilization efficiency and O3 concentration reduce to 66% and 0.17 ppm, respectively. The Au/TiO2 in the PPS enables a uniform corona discharge, enhances the interaction between plasma, E. coli, and nanocatalysts, and suppresses the formation of O3. Further, the Au/TiO2 can be excited by ultraviolet-visible light emitted from the plasma to generate electron-hole pairs, and thus contributes to the formation of reactive radicals and the oxidative inactivation of E. coli. The PPS constructed by needle array corona discharge and the Au-based plasmonic nanocatalyst provides a promising approach for developing high-efficiency sterilization techniques.

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Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation

Cited by 16 publications

References 29 publications

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Disinfection of the air and surfaces in the dental clinic using hydroxyl radical (OH-) based technology: A systematic review

Improving plasma sterilization by constructing a plasma photocatalytic system with a needle array corona discharge and Au plasmonic nanocatalyst

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Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO2 layers formed on Ti–(0–10)at%Au alloys by air oxidation

Cited by 16 publications

References 29 publications

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Visible Light-Enhanced Antibacterial and Osteogenic Functionality of Au and Pt Nanoparticles Deposited on TiO2 Nanotubes

Disinfection of the air and surfaces in the dental clinic using hydroxyl radical (OH-) based technology: A systematic review

Improving plasma sterilization by constructing a plasma photocatalytic system with a needle array corona discharge and Au plasmonic nanocatalyst

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Visible‐light‐responsive antibacterial activity of Au‐incorporated TiO₂ layers formed on Ti–(0–10)at%Au alloys by air oxidation