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

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)255-261
ページ数7
ジャーナルApplied Surface Science
489
DOI
出版ステータスPublished - 2019 9 30

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 物理学および天文学(全般)
  • 表面および界面
  • 表面、皮膜および薄膜

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