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

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

doi:10.1002/chem.201501509

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

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

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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.

Original language	English
Pages (from-to)	13073-13079
Number of pages	7
Journal	Chemistry - A European Journal
Volume	21
Issue number	37
DOIs	https://doi.org/10.1002/chem.201501509
Publication status	Published - 2015 Sept 1

Keywords

niobium
oxides
porosity
template synthesis
titanium

ASJC Scopus subject areas

Catalysis
Organic Chemistry

Access to Document

10.1002/chem.201501509

Cite this

Kitahara, M., Shimasaki, Y., Matsuno, T., Kuroda, Y., Shimojima, A., Wada, H., & Kuroda, K. (2015). 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. Chemistry - A European Journal, 21(37), 13073-13079. https://doi.org/10.1002/chem.201501509

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. / Kitahara, Masaki; Shimasaki, Yuta; Matsuno, Takamichi et al.
In: Chemistry - A European Journal, Vol. 21, No. 37, 01.09.2015, p. 13073-13079.

Research output: Contribution to journal › Article › peer-review

Kitahara, M, Shimasaki, Y, Matsuno, T, Kuroda, Y, Shimojima, A, Wada, H & Kuroda, K 2015, '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', Chemistry - A European Journal, vol. 21, no. 37, pp. 13073-13079. https://doi.org/10.1002/chem.201501509

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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.",

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