Morphology-controlled synthesis of cubic cesium hydrogen silicododecatungstate crystals

Sayaka Uchida, Yoshiyuki Ogasawara, Toshiaki Maruichi, Akihito Kumamoto, Yuichi Ikuhara, Teppei Yamada, Hiroshi Kitagawa, Noritaka Mizuno

研究成果: ジャーナルへの寄稿学術誌査読

11 被引用数 (Scopus)

抄録

Cubic particles of cesium hydrogen silicododecatungstate crystals are obtained for the first time by the use of spherical seed crystals and control of the Cs+ to SiW12O404- (Cs/POM) ratio in the synthetic solution. The morphology of the particles is controlled between rhombic dodecahedra faceted with {110} planes (thermodynamically stable morphology) and cubes faceted with {100} planes. Scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy analysis of the cross-section shows that the cubes possess a core-shell structure, and the Cs/POM ratio of the shell (ave. 3.24) is larger than that of the core (ave. 2.76), suggesting the existence of anion (POM) vacancies in the shell. Solid state magic angle spinning NMR spectroscopy, nitrogen adsorption, and water vapor sorption measurements of the cubes show that the porous core is covered by the dense shell, and only water molecules can diffuse through the dense shell via the anion vacancies. Despite the small amounts of acidic protons, the cubes exhibit moderate proton conductivity (2.5 × 10-4 S cm-1) at room temperature under water vapor (298 K, P/P0 = 0.95), suggesting that mobile water molecules in the anion vacancies contribute to the proton conduction.

本文言語英語
ページ(範囲)6620-6626
ページ数7
ジャーナルCrystal Growth and Design
14
12
DOI
出版ステータス出版済み - 12月 3 2014

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

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