Implications of Precursor Chemistry on the Alkaline Hydrothermal Synthesis of Titania/Titanate Nanostructures

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Abstract

A systematic study of four parameters within the alkaline hydrothermal treatment of three commercial titania powders—anatase, rutile, and Degussa P25—was made. These powders were treated with 5, 7.5, 9, and 10 M NaOH between 100 and 220 °C for 20 h. The effects of alkaline concentration, hydrothermal temperature, and precursor phase and crystallite size on the resultant nanostructure formation have been studied through X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and nitrogen adsorption. Through the correlation of these data, morphological phase diagrams were constructed for each commercial powder. Interpretation of the resultant morphological phase diagrams indicates that alkaline concentration and hydrothermal temperature affect nanostructure formation independently, where nanoribbon formation is significantly influenced by temperature for initial formation. The phase and crystallite size of the precursor also significantly influenced nanostructure formation, with rutile displaying a slower rate of precursor consumption compared with anatase. Small crystallite titania precursors formed nanostructures at reduced hydrothermal temperatures.

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This article has been cited by 3 ACS Journal articles (3 most recent appear below).

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  Hydrothermal Growth of Layered Titanate Nanosheet Arrays on Titanium Foil and Their Topotactic Transformation to Heterostructured TiO₂ Photocatalysts

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  • Hydrothermal Growth of Layered Titanate Nanosheet Arrays on Titanium Foil and Their Topotactic Transformation to Heterostructured TiO₂ Photocatalysts

    Changhua Wang, Xintong Zhang, Yanli Zhang, Yan Jia, Jikai Yang, Panpan Sun, and Yichun Liu
    The Journal of Physical Chemistry C2011 115 (45), 22276-22285

    Layered titanate nanostructures have been recognized as an important intermediate in preparing TiO2 nanostructures due to their availability in various morphologies, among which ultrathin nanosheets have attracted particular attention due to their unique ...

    Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
• 

  Visible-Light-Derived Photocatalyst Based on TiO_2−δN_δ with a Tubular Structure

  Yoshikazu Hirose, Toshinori Mori, Yuka Morishita, Atsushi Itadani, Takayuki Kudoh, Takahiro Ohkubo, Tomoko Matsuda, Shigeharu Kittaka, and Yasushige Kuroda
  Inorganic Chemistry2011 50 (20), 9948-9957

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    Inorganic Chemistry2011 50 (20), 9948-9957

    We succeeded in achieving visible-light responsiveness on a tubular TiO2 sample through the treatment of a tubular TiO2 that has a large surface area with an aqueous solution of ammonia or triethylamine at room temperature and subsequent calcination at ...

    Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
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  Growth of Various TiO₂ Nanostructures for Dye-Sensitized Solar Cells

  Fang Shao, Jing Sun, Lian Gao, Songwang Yang, and Jianqiang Luo
  The Journal of Physical Chemistry C2011 115 (5), 1819-1823

  • Growth of Various TiO₂ Nanostructures for Dye-Sensitized Solar Cells

    Fang Shao, Jing Sun, Lian Gao, Songwang Yang, and Jianqiang Luo
    The Journal of Physical Chemistry C2011 115 (5), 1819-1823

    Several kinds of one-dimensional TiO2 nanostructures including nanorod arrays, nanobelt arrays, and fan-shaped rectangular parallelepiped rods were prepared by alkali hydrothermal method. Their morphology and crystalline phase could be controlled by ...

    Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links

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