| 研究課題/領域番号 |
20K15121
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分28020:ナノ構造物理関連
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| 研究機関 | 国立研究開発法人理化学研究所 |
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研究代表者 |
李 臻 国立研究開発法人理化学研究所, 光量子工学研究センター, 基礎科学特別研究員 (20869359)
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| 研究期間 (年度) |
2020-04-01 – 2022-03-31
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| 研究課題ステータス |
中途終了 (2021年度)
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| 配分額 *注記 |
4,160千円 (直接経費: 3,200千円、間接経費: 960千円)
2021年度: 1,950千円 (直接経費: 1,500千円、間接経費: 450千円)
2020年度: 2,210千円 (直接経費: 1,700千円、間接経費: 510千円)
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| キーワード | carbon nanotubes / boron nitride nanotubes / heterostructure / excitons / photoluminescence / heterostructures |
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| 研究開始時の研究の概要 |
Novel excitonic properties in the 1D coaxial heterostructures will be explored via optical means. Exciton energy modulation in the carbon nanotube core and interlayer excitons induced by BN coating will be studied. Field-effect transistors will be developed to realize tunable single-photon emission.
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| 研究実績の概要 |
Boron nitride coated single-walled carbon nanotubes were synthesized on location-tagged TEM grids by chemical vapor deposition. The number of boron nitride shells was controlled by adjusting the coating time. Due to the atomically thin nature of carbon nanotubes, boron nitride coating with different thickness yields different excitonic energy shifts observed by photoluminescence excitation spectroscopy. Both blueshift and redshift of the excitonic energy were observed, the redshift was considered to be caused by dielectric screening from the boron nitride shells and the blueshift was a result of the strain introduced by nonuniform coating. Nonetheless, more coating of boron nitride shells indeed gave rise to large excitonic energy shifts. Transmission electron microscopy was also performed to explore the relationship between the actual boron nitride shell number and the redshift of the excitonic energies. Identification of the carbon nanotubes that had been measured by photoluminescence excitation spectroscopy turned out to be difficult. A lower density of carbon nanotubes were necessary to ease the identification process. Chemical vapor deposition with lower density of catalysts and shorter coating time are in process.
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