Synthesis of oxygen-deficient blue titanium oxide by discharge plasma generated in aqueous ammonia solution

Yoshiteru Mizukoshi, Megumi Ohwada, Satoshi Seino, Hiroshi Horibe, Yoshimi Nishimura, Chiaki Terashima

Research output: Contribution to journalArticlepeer-review

Abstract

When discharge plasma was generated in an aqueous ammonia solution containing titanium dioxide (TiO2) powder, blue TiO2 was obtained. The blue TiO2 contained oxygen defects and Ti3+ formed by the plasma treatment; i.e., reducing species such as hydrogen radicals generated in situ during ammonia decomposition by plasma were considered to reduce TiO2. No marked changes in the crystallographic structure and specific surface area of TiO2 were observed after the plasma treatment, indicating that TiO2 was not exposed to high temperature. In addition, the plasma-treated TiO2 remained blue when exposed to air for several months. The photocatalytic activity of anatase TiO2 under visible light irradiation was enhanced after plasma treatment. In contrast, the plasma-treated rutile TiO2 showed inferior photocatalytic activity under visible light irradiation compared with that of the untreated rutile TiO2.

Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalApplied Surface Science
Volume489
DOIs
Publication statusPublished - 2019 Sep 30

Keywords

  • Defects
  • Electron energy loss spectroscopy
  • Oxide
  • Photocatalyst
  • Raman spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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