研究課題/領域番号 |
22KF0394
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補助金の研究課題番号 |
21F21033 (2021-2022)
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研究種目 |
特別研究員奨励費
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配分区分 | 基金 (2023) 補助金 (2021-2022) |
応募区分 | 外国 |
審査区分 |
小区分32020:機能物性化学関連
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研究機関 | 国立研究開発法人理化学研究所 |
研究代表者 |
金 有洙 国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (50373296)
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研究分担者 |
JACULBIA RAFAEL 国立研究開発法人理化学研究所, 開拓研究本部, 外国人特別研究員
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研究期間 (年度) |
2023-03-08 – 2024-03-31
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研究課題ステータス |
交付 (2023年度)
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配分額 *注記 |
2,300千円 (直接経費: 2,300千円)
2023年度: 200千円 (直接経費: 200千円)
2022年度: 1,100千円 (直接経費: 1,100千円)
2021年度: 1,000千円 (直接経費: 1,000千円)
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キーワード | graphene / STM / tip enhancement / Raman spectroscopy / defect / strain |
研究開始時の研究の概要 |
This research will concentrate mainly on the development of a new facility that has not been realized previously. This involves extending the capability of the host laboratory’s STM based tip-enhanced Raman spectroscopy setup to allow for investigating THz-Raman modes of graphene.
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研究実績の概要 |
For this project, graphene grown on Au(111) surface via chemical vapour deposition was investigated. Samples were investigated using STM, STS and STM-TERS. STM imaging revealed the honeycomb structure and Moire patterns typically observed in graphene. The STM-TERS spectra showed the G, D and 2D band of graphene. Moreover, the spectra showed a splitting of the G-band which we attribute to a combination of uniaxial strain, and the presence of defects on the graphene layer. Apart from single point STM-TERS measurement, we were also able to perform STM-TERS mapping. Because of weak Raman signals, STM-TERS mapping is challenging as it required long acquisition times. For this, we utilized the automated remote experiment system we designed. This allowed us to conveniently and safely perform the experiment while not being physically present in the experimental room. The results of the mapping revealed the presence of a domain boundary which was not observed in the STM images.
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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
In this project we have built a setup for obtaining tip-enhanced Terahertz Raman spectroscopy based on the STM. We investigated Graphene Samples grown on Au(111) via CVD using STM-Tip enhanced Raman spectroscopy. The STM-TERS spectra showed the typical peaks expected for graphene samples, except that the G-band showed splitting. STM-TERS mapping revealed that there is some residual strain possible introduced during growth owing to the lattice mismatch between the graphene layer and the Au (111) substrate. Our results reveal that STM-TERS imaging is effective in revealing the strain in CVD grown Graphene samples.
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今後の研究の推進方策 |
In the future, we intend to apply our technique to investigate other 2D materials and single molecules in order to discover more information about their interactions.
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