Preparation of mesoporous nitrogen-doped titania comprising large crystallites with low thermal conductivity

Yuta Shimasaki, Takamichi Matsuno, Quansheng Guo, Atsushi Shimojima, Hiroaki Wada, Takao Mori, Kazuyuki Kuroda*

*この研究の対応する著者

研究成果: Article査読

抄録

Reducing the thermal conductivity (κ) of mesoporous N-doped titania (TiO2) is crucial for the development of TiO2-based materials that exhibit excellent electronic, photochemical, and thermoelectric properties. Mesopores can contribute to the reduction of κ via phonon scattering, and the scattering effect due to the randomness of crystal interfaces should be significantly reduced to clarify the role of mesopores in reducing thermal conductivity. Highly ordered mesoporous N-doped TiO2 comprising large crystallites was prepared with silica colloidal crystals as a template into which a Ti source was introduced, followed by calcination with urea. N-doped samples comprising large crystallites exhibiting random mesopores were also prepared and used for the investigation of the effects of the shape and arrangement of the mesopore on phonon scattering. The mesostructures of the two separately prepared N-doped TiO2 samples were retained after sintering at 873 K and 80 MPa to fabricate pellets. Furthermore, the effective suppression of the long mean-free-path phonon conduction by the thin pore walls at a nanometer scale thickness significantly reduced the thermal conductivities of both samples. The presence of ordered mesopores further contributed to the reduction of κ, which was probably due to the enhanced contribution of the backscattering of phonons caused by ordered pore wall surfaces.

本文言語English
ページ(範囲)2509-2520
ページ数12
ジャーナルNanoscale Advances
4
11
DOI
出版ステータスPublished - 2022 5月 9

ASJC Scopus subject areas

  • バイオエンジニアリング
  • 原子分子物理学および光学
  • 化学 (全般)
  • 材料科学(全般)
  • 工学(全般)

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