2023 Fiscal Year Final Research Report

Bottom-up synthesis of metalate nanosheets with metallic properties and the fabrication of thin films with highly anisotropic optical properties by using their nanosheets

Research Project

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Project/Area Number	21K05225
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
Research Institution	Gifu University
Principal Investigator	Ban Takayuki 岐阜大学, 工学部, 教授 (70273125)
Project Period (FY)	2021-04-01 – 2024-03-31
Keywords	ナノ材料合成 / ナノシート / 水溶液化学 / 薄膜 / ゾルゲル法 / ハイブリッド材料 / ナノフレーク
Outline of Final Research Achievements	Previously, we found out the bottom-up synthesis of flake-like metalate nanosheets (metalate nanoflakes) by aqueous solution process. Until now, only insulative metalate nanoflakes have been synthesized by this method. In this study, ruthenate nanoflakes with a high electric conductivity were synthesized. Moreover, the catalytic properties of the ruthenate nanoflakes were also investigated. For electrochemical water-splitting, the ruthenate nanoflakes played an important role in the facilitation of hydrogen evolution reaction. Layered titanate thin films with high orientations were fabricated from aqueous sols of titanate nanoflakes. The influence of highly anisotropic structures of the thin films on their properties was investigated. With increasing the interval of titanate layers, the difference in refractive index between in-plane direction and out-of-plane one became larger, resulting in highly anisotropic optical properties.
Free Research Field	無機材料化学
Academic Significance and Societal Importance of the Research Achievements	我々が見出した「金属酸ナノフレークのボトムアップ合成法」は、基礎科学的な「水溶液の化学」に基づいてみると、あまり用いられないpH調整剤を用いることで見出された、これまで見落とされていた化学的現象であると見ることができる。よって、この「化学的現象」を「機能性材料の合成」に展開することは、学術的に意義がある。この合成法で得られるナノフレークは、面内サイズの小さい二次元構造をもつ。よって本研究では、ナノフレークの小さい形態を利用した触媒への応用と、ナノフレークの二次構造が作り出す「構造の異方性」が「物性の異方性」にどのように影響するのかを検討し、興味深い知見が得られた。