Formation of bioactive N-doped TiO2 on Ti with visible light-induced antibacterial activity using NaOH, hot water, and subsequent ammonia atmospheric heat treatment

Masakazu Kawashita, Naoko Endo, Tomoaki Watanabe, Toshiki Miyazaki, Maiko Furuya, Kotoe Yokota, Yuki Abiko, Hiroyasu Kanetaka, Nobuhiro Takahashi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Titanium (Ti) treated with NaOH and hot water, and heated in an ammmonia (NH3) gas atmosphere for 1 or 3 h exhibited in vitro apatite formation within 7 days when soaked in simulated body fluid (SBF). Moreover, the treated Ti decomposed methylene blue and showed excellent bactericidal activity against Escherichia coli under visible light irradiation. The surface treatment resulted in the formation of a fine network of N-doped anatase-type titania (TiO2-xNx) on the Ti surface, which was responsible for both the apatite formation in SBF and the visible light-induced antibacterial activity. These preliminary results highlight the efficacy of our simple method for producing novel bioactive Ti with visible light-induced antibacterial activity, which could be applied to orthopaedic and dental implants without the risk of infection.

Original languageEnglish
Pages (from-to)285-290
Number of pages6
JournalColloids and Surfaces B: Biointerfaces
Volume145
DOIs
Publication statusPublished - 1 Sep 2016

Keywords

  • Apatite
  • Nitrogen
  • Simulated body fluid
  • Titania
  • Titanium
  • Visible light-induced antibacterial activity

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