In vitro and in vivo antibacterial activity of graphene oxide-modified porous TiO2 coatings under 808-nm light irradiation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)540–545
Journal / PublicationRare Metals
Issue number2
Online published15 May 2021
Publication statusPublished - Feb 2022


Bio-inertness and post-surgery infection on titanium (Ti) are the main causes of failure of biomedical implants in vivo. Near-infrared (NIR) photoactivated antibacterial therapy including photothermal and photodynamic therapies has attracted increasing attention due to the high bactericidal efficiency and little side effects. Although micro-arc oxidation (MAO) is an effective method to improve the biological activity of Ti implants, the porous TiO2 coatings prepared by MAO do not respond to near-infrared (NIR) light to kill bacteria by the photothermal and photodynamic effects. In this work, graphene oxide (GO)-modified TiO2 coatings (TiO2/GO) are prepared on Ti to improve the photothermal and photodynamic ability of the MAO coatings. The TiO2/GO coatings exhibit excellent antibacterial activity both in vitro and in vivo against Streptococcus mutans (S. mutans) under 808-nm NIR light irradiation due to the synergistic effects rendered by hyperthermia and reactive oxygen species (ROS). The NIR light-responsive antibacterial MAO coatings have large potential in combating implant-associated infections in clinical applications.

Research Area(s)

  • Antibacterial activity, Graphene oxide (GO), Photo-therapy, Porous TiO2 coating