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Synergistic enhancement of photocatalytic antibacterial effects in high-strength aluminum/TiO2 nanoarchitectures

Mesbah, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2020.06.207
  3. Publisher: Elsevier Ltd , 2020
  4. Abstract:
  5. Unlike gold and silver, aluminum shows a localized surface plasmon resonance (LSPR) over a wide spectral range from ultraviolet (UV) to the visible region. Herein, we demonstrate a new process to optically couple TiO2 nanotubes (NTs) with a high-strength aluminum substrate, to achieve a synergistic enhancement of photocatalytic antibacterial effects through controlled LSPR of aluminum. The high-strength aluminum substrate was produced by tubular channel angular pressing (TCAP). Their LSPR was tailored through the formation of superficial nano-concave arrays (NCAs) with desired concave diameters. A layer of aligned TiO2 NTs was fabricated on the surface of aluminum nano-concave arrays (Al NCAs) by anodization of a thin film of titanium. When the diameter of Al NCAs reached ~80 nm, a strong LSPR near the optical bandgap of TiO2 NTs was detected, whereby a synergistic antibacterial effect to Escherichia coli (E. coli) was observed through the coupling of TiO2 NTs photocatalysis and LSPR effect of Al NCAs (80 nm) in the UV-A range. The TiO2 NTs/Al NCAs hybrid surface showed excellent resistance against scratch. The results presented here may open a door for the further development of self-cleaning medical tools based on the decontamination strategies. © 2020 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Biomedical applications ; Localized surface plasmon resonance (LSPR) ; Photocatalytic antibacterial effects ; TiO2 nanotubes ; Ultrafine-grained aluminum ; Decontamination ; Oxide minerals ; Plasmons ; Pressing (forming) ; Surface plasmon resonance ; Titanium dioxide ; Antibacterial effects ; Escherichia coli (E. coli) ; High strength aluminum ; Nanoarchitectures ; Synergistic enhancement ; Tubular channel angular pressings ; Wide spectral range ; Aluminum
  8. Source: Ceramics International ; Volume 46, Issue 15 , October , 2020 , Pages 24267-24280
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884220318678