| 研究課題/領域番号 |
16F16371
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| 研究機関 | 国立研究開発法人物質・材料研究機構 |
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研究代表者 |
知京 豊裕 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主任研究者 (10354333)
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| 研究分担者 |
MOHAMED MOHAMED 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 外国人特別研究員
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| 研究期間 (年度) |
2016-10-07 – 2019-03-31
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| キーワード | Sol-gel science / mesoporous frameworks / metal oxides / films / thermal stability / dielectrics / ferromagnetism / capacitors |
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| 研究実績の概要 |
Ferroelectric materials are useful for many applications.Recent researches on stain engineering have opened a novel approach to apply BTO and STO in high-temperature ferroelectric applications. High-strain energy through substrate-controlled and coherent in-plane biaxial strain can facilitate a large enhancement in Tc and remanent polarization (Pr) in various ferroelectrics. Horizontal strains within layered heterostructures has been widely studied so far. Currently, coherent in-plane biaxial strain has attracted much attention. For practical applications, a facile process that can introduce high strains into materials is highly desirable for reducing the production costs and times. Thus, we are trying to find a new class of highly stable ferroelectric material composite film, by surfactant-templated sol-gel method. Owing to the concave surface geometry and abundant hetero-interface between inorganic template and printed inorganic source, a large number of strains can be created in the composite film, thereby leading to dramatic enhancement of ferroelectric property. The presenting new concept would be useful for preparing other hetero-nanostructures. Further manipulation of dielectric materials should improve their ferroelectricity and would create new solid-state property for next-generation optoelectronic devices in future.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
We have demonstrated the rule of using a controlling agent as a co-reactant, trisodium citrate dihydrate (TSCD), on the crystal growth process of Mn-Ru coordination polymer (Mn-Ru CP) nanocubes. The size and shape of the final product is found to be tuned by increasing the amount of TSCD. A controlled thermal treatment in the aerobics results in synergetic Mn-Ru mixed oxides. The obtained Mn-Ru oxide is a promising catalyst for the oxygen reduction reaction (ORR) through an exact four-electron pathway. The obtained Mn-Ru oxide shows an efficient electrocatalytic activity toward ORR with long-term durability compared to Mn3O4 or RuO2. We expect that, its high catalytic activity is attributed to the fine cubic structure, synergetic composition, and intrinsic high electrochemical activity of ruthenium metal. Our approach can be extended in the future for the synthesis of other synergetic mixed transition metals oxide to meet the developments of the recent applications in industry.
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| 今後の研究の推進方策 |
Recently multiferroicis focused but not realized at high temperatures, thus we try to use mesoporous thins films of the dielectric materials as a template for printing highly strained magnetic materials inside the porous structure. This would be useful for fabrication of electric capacitors work efficiently at elevated temperatures.Self-assembly of various PBAs into the surface of the functionalized Si substrate followed by calcination for derivation nanoporous thin films of oxides or carbides.Controlled synthesis of mesoporous nanoparticles by surfactant-assisted electrochemical-deposition method.Condensation of highly ordered nanoparticles with crystalline symmetry in mesoporous thin films.Sol-gel derived frameworks of mesoporous crystalline metal oxides.
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