Preparation of anatase, rutile and brookite type anion doped titania photocatalyst nanoparticles and thin films

Shu Yin, Ken Ihara, Bin Liu, Yuhua Wang, Ruixing Li, Tsugio Sato

    Research output: Contribution to journalConference articlepeer-review

    15 Citations (Scopus)

    Abstract

    Anatase, brookite and rutile type nitrogen doped titania nanocrystals (TiO2-xNy) which possessed beige color were successfully prepared as single phase using homogeneous precipitation-solvothermal process in TiCl3-hexamethylenetetramine (C6H12N 4) aqueous and alcohol solutions at temperature as low as 190 °C. The phase composition, crystallinity, microstructure, specific surface area, nitrogen doped amount and photocatalytic activity of titania powders were greatly changed depending on pH, temperature and kind of treatment alcohols. TiO2-xNy films with various phases and high surface area could be prepared using a novel low temperature process, i.e. a spin-coating of TiO2-xNy powder using an organic binder followed by oxygen plasma treatment below 60 °C within a short time period. The nitrogen doped yellowish titania powders and films possessed excellent light absorption up to 565 nm, and showed excellent visible light induced photocatalytic ability under irradiation of visible light of wavelength >510 nm. The relationship between the phase composition, photocatalytic activity and hydrophilic ability of the film was investigated in detail. The effects of film thickness, surface roughness and porosity on the photocatalytic activity were discussed.

    Original languageEnglish
    Pages (from-to)268-273
    Number of pages6
    JournalPhysica Scripta T
    VolumeT129
    DOIs
    Publication statusPublished - 2007 Dec 1
    Event2nd International Symposium on Functional Materials - Hangzhou, China
    Duration: 2007 May 162007 May 19

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Mathematical Physics
    • Condensed Matter Physics

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