2019 Fiscal Year Final Research Report
Template synthesis of one-dimensional transition metal chalcogenides inside nanotubes
| Project/Area Number |
18K14088
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28030:Nanomaterials-related
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2020-03-31
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| Keywords | ナノワイヤー / カーボンナノチューブ / 原子分解能電子顕微鏡 / 鋳型合成 / 遷移金属カルコゲナイド |
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| Outline of Final Research Achievements |
Atomically thin 1D transition metal monochalocogenides (TMMs) have been anticipated as promising building blocks for integrated nanoelectronics. However, their isolation has thus far remained a challenge, due to the lack of effective techniques. In this work, we report the facile synthesis of TMM nanowires by using carbon nanotubes as molds. Each nanowire is perfectly separated by a carbon nanotube with a minimal interaction, enabling detailed characterization of the single-wires. Experimental and theoretical analyses revealed that the choice of suitable metal oxides as a precursor provides feasible yields for their characterization. Transmission electron microscopy revealed unusual torsional motions absent in their bulk crystals. These vdW-wired materials offer solutions to theoretical questions such as low-dimensional electromechanical behavior and practical concerns such as flexible nanocables and high-efficiency cathodes.
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| Free Research Field |
ナノサイエンス，ナノ材料科学
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| Academic Significance and Societal Importance of the Research Achievements |
本ナノワイヤーは「ポストナノカーボン」として物性物理学で以前から重要性が認識され，多くの研究者が合成に挑戦してきたが，有力な合成法はなかった。カーボンナノチューブを用いた鋳造反応は本ナノワイヤーを合成する唯一の手段である。これにより，長年困難だった物性研究が飛躍的に進み，未知の量子現象や新機能の発見が期待できる。また，本ナノワイヤーはカーボンナノチューブの電気・熱輸送特性を大きく変調することがわかっており，カーボンナノチューブを材料にした両極性トランジスターや高効率な熱電変換素子が実現する可能性もある。それにより，工学分野への波及効果も期待でき，省エネルギー社会の実現にも貢献できる。
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