Tip enhanced Terahertz - Raman for investigating graphene-water interactions at the nanoscale

尖端增强太赫兹 - 拉曼用于研究纳米级石墨烯-水相互作用

• 批准号: 22KF0394
• 负责人: 金 有洙
• 金额: $ 1.47万
• 依托单位: Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KF0394/
• 关键词: graphene; STM; tip enhancement; Raman spectroscopy; defect; strain

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.

对于该项目，研究了通过化学蒸气沉积在AU（111）表面生长的石墨烯。 使用STM，STS和STM-TERS研究了样品。 STM成像揭示了在石墨烯中通常观察到的蜂窝结构和Moire模式。 STM-TERS光谱显示了石墨烯的G，D和2D带。 此外，光谱显示了我们归因于单轴应变的组合以及石墨烯层上缺陷的组合的分裂。 除了单点STM测量，我们还能够执行STM TERS映射。 由于拉曼信号较弱，因此STM-TERS映射需要长时间的收购时间，因此具有挑战性。 为此，我们利用了我们设计的自动远程实验系统。 这使我们可以方便安全地执行实验，同时又没有在实验室中进行物理存在。 映射的结果揭示了在STM图像中未观察到的域边界的存在。

项目成果

Atomically Precise Delineation of As Antisite Defect States from Undoped Gallium Arsenide Host Lattice by Scanning Tunneling Microscopy and Spectroscopy Measurements and Density Functional Theory Calculations

通过扫描隧道显微镜和光谱测量以及密度泛函理论计算对未掺杂砷化镓主晶格的 As 反位缺陷态进行原子精确描绘

• DOI: 10.1002/pssb.202100652
• 发表时间: 2022
• 期刊: physica status solidi (b)
• 作者: Balgos Maria Herminia M.;Esca?o Mary Clare S.;Jaculbia Rafael B.;Quang Nguyen Tien;Prieto Elizabeth Ann P.;Estacio Elmer S.;Salvador Arnel A.;Somintac Armando S.;Tani Masahiko;Hayazawa Norihiko;Kim Yousoo
• 通讯作者: Kim Yousoo

Orbital-resolved visualization of single-molecule photocurrent channels

• DOI: 10.1038/s41586-022-04401-0
• 发表时间: 2022-03-31
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Imai-Imada, Miyabi;Imada, Hiroshi;Kim, Yousoo
• 通讯作者: Kim, Yousoo

Effect of detection angle and substrate in the polarization analysis of 1D dipole emission

一维偶极子发射偏振分析中检测角度和基质的影响

• DOI: 10.1364/josab.442109
• 发表时间: 2021
• 期刊: Journal of the Optical Society of America B
• 作者: Dasallas Lean;Jaculbia Rafael;Balois-Oguchi Maria Vanessa;Garcia Wilson;Hayazawa Norihiko
• 通讯作者: Hayazawa Norihiko

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University of the Philippines(フィリピン)

菲律宾大学