Solution-Based Fabrication of Perovskite Multilayers and Superlattices Using Nanosheet Process

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概要

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• We report a solution-based fabrication of perovskite multilayers and superlattices using perovskite nanosheets. Perovskite nanosheets (LaNb₂O₇, Ca₂Nb₃O₁₀, and Sr₂Nb₃O₁₀) were prepared by delaminating layered perovskites. A layer-by-layer approach using Langmuir--Blodgett deposition was effective for fabricating high-quality nanofilms of perovskite nanosheets on various substrates, such as quartz glass, Si, and SrRuO₃. Structural characterizations by X-ray diffraction, transmission electron microscopy, and hard X-ray photoelectron spectroscopy revealed that these perovskite nanofilms are composed of a well-ordered lamellar structure with an atomically sharp interface. The multilayer films exhibited a stable dielectric response inherent to the perovskite nanosheet. We also found that the superlattices of (LaNb₂O₇/Ca₂Nb₃O₁₀)₅ and (Sr₂Nb₃O₁₀/Ca₂Nb₃O₁₀)₅ possess strong interface coupling, which gives rise to enhanced dielectric constant.

• 2011-09-25

著者

• Osada Minoru

  International Center for Materials Nanoarchitectonics, National Institute for Materials Science

• SASAKI Takayoshi

  International Center for Materials Nanoarchitectonics

• Sasaki Takayoshi

  International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Li Bao-Wen

  International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Ozawa Tadashi

  International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Ebina Yasuo

  International Center for Materials Nanoarchitectonics (MANA) and Nanoscale Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Ebina Yasuo

  International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Akatsuka Kosho

  International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan

• Osada Minoru

  International Center for Materials Nanoarchitectonics (MANA) and Nanoscale Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Li Bao-Wen

  International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan

• Li Bao-Wen

  International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan

• Ozawa Tadashi

  International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan

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