The Critical Effect of Niobium Doping on the Formation of Mesostructured TiO<inf>2</inf>

Single-Crystalline Ordered Mesoporous Nb-TiO<inf>2</inf> and Plate-like Nb-TiO<inf>2</inf> with Ordered Mesoscale Dimples

Masaki Kitahara, Yuta Shimasaki, Takamichi Matsuno, Yoshiyuki Kuroda, Atsushi Shimojima, Hiroaki Wada, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Highly ordered mesoporous niobium-doped TiO<inf>2</inf> with a single-crystalline framework was prepared by using silica colloidal crystals with ca. 30 nm in diameter as templates. The preparation of colloidal crystals composed of uniform silica nanoparticles is a key to obtain highly ordered mesoporous Nb-doped TiO<inf>2</inf>. The XPS measurements of Nb-doped TiO<inf>2</inf> showed the presence of Nb<sup>5+</sup> and correspondingly Ti<sup>3+</sup>. With the increase in the amount of doped Nb, the crystalline phase of the product was converted from rutile into anatase, and the lattice spacings of both rutile and anatase phases increased. Surprisingly, the increase in the amount of Nb led to the formation of plate-like TiO<inf>2</inf> with dimpled surfaces on one side, which was directly replicated from the surfaces of the colloidal silica crystals.

    Original languageEnglish
    Pages (from-to)13073-13079
    Number of pages7
    JournalChemistry - A European Journal
    Volume21
    Issue number37
    DOIs
    Publication statusPublished - 2015 Sep 1

    Fingerprint

    Niobium
    Silica
    Doping (additives)
    Silicon Dioxide
    Crystalline materials
    Titanium dioxide
    Crystals
    X ray photoelectron spectroscopy
    Nanoparticles
    titanium dioxide

    Keywords

    • niobium
    • oxides
    • porosity
    • template synthesis
    • titanium

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

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    title = "The Critical Effect of Niobium Doping on the Formation of Mesostructured TiO2: Single-Crystalline Ordered Mesoporous Nb-TiO2 and Plate-like Nb-TiO2 with Ordered Mesoscale Dimples",
    abstract = "Highly ordered mesoporous niobium-doped TiO2 with a single-crystalline framework was prepared by using silica colloidal crystals with ca. 30 nm in diameter as templates. The preparation of colloidal crystals composed of uniform silica nanoparticles is a key to obtain highly ordered mesoporous Nb-doped TiO2. The XPS measurements of Nb-doped TiO2 showed the presence of Nb5+ and correspondingly Ti3+. With the increase in the amount of doped Nb, the crystalline phase of the product was converted from rutile into anatase, and the lattice spacings of both rutile and anatase phases increased. Surprisingly, the increase in the amount of Nb led to the formation of plate-like TiO2 with dimpled surfaces on one side, which was directly replicated from the surfaces of the colloidal silica crystals.",
    keywords = "niobium, oxides, porosity, template synthesis, titanium",
    author = "Masaki Kitahara and Yuta Shimasaki and Takamichi Matsuno and Yoshiyuki Kuroda and Atsushi Shimojima and Hiroaki Wada and Kazuyuki Kuroda",
    year = "2015",
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    AU - Kitahara, Masaki

    AU - Shimasaki, Yuta

    AU - Matsuno, Takamichi

    AU - Kuroda, Yoshiyuki

    AU - Shimojima, Atsushi

    AU - Wada, Hiroaki

    AU - Kuroda, Kazuyuki

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    AB - Highly ordered mesoporous niobium-doped TiO2 with a single-crystalline framework was prepared by using silica colloidal crystals with ca. 30 nm in diameter as templates. The preparation of colloidal crystals composed of uniform silica nanoparticles is a key to obtain highly ordered mesoporous Nb-doped TiO2. The XPS measurements of Nb-doped TiO2 showed the presence of Nb5+ and correspondingly Ti3+. With the increase in the amount of doped Nb, the crystalline phase of the product was converted from rutile into anatase, and the lattice spacings of both rutile and anatase phases increased. Surprisingly, the increase in the amount of Nb led to the formation of plate-like TiO2 with dimpled surfaces on one side, which was directly replicated from the surfaces of the colloidal silica crystals.

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    KW - oxides

    KW - porosity

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