Microstructure and bactericidal ability of photocatalytic TiO 2 thin films prepared by rf helicon magnetron sputtering

Lei Miao, Sakae Tanemura, Yoichi Kondo, Misao Iwata, Shoichi Toh, Kenji Kaneko

研究成果: Conference article査読

70 被引用数 (Scopus)

抄録

The present study investigates the microstructure and bactericidal ability of polycrystalline and epitaxial TiO 2 thin films with anatase and rutile structure. Phase formation and the distortion of the lattice of the film compared with bulk are proved by TEM observation. HRTEM images assure the good crystal quality and compact structure of the films prepared by rf helicon magnetron sputtering. This obtained larger band gap due to the lattice deformation could contribute to the better photocatalytic effect of the anatase film. Bactericidal abilities evaluated by the photokilling E. Coli using film stick method under UV irradiation show the following result: Both single and polycrystal anatase films exhibit obvious bactericidal abilities while no distinguishing difference for them. On the other hand, no bactericidal ability is observed for rutile films in this work. The band gap value of rutile film is lower than the energy potential required to O 2 /O 2 - reductions according to the principle proposed by Fujishima et al. This resulted in the observed poor photocatalyst effect of rutile film.

本文言語English
ページ(範囲)125-131
ページ数7
ジャーナルApplied Surface Science
238
1-4 SPEC. ISS.
DOI
出版ステータスPublished - 2004 11月 15
外部発表はい
イベントAPHYS 2003 - Badajoz, Spain
継続期間: 2003 10月 132003 10月 18

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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