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Saito R, Hung NT, Yang T, Huang J, Liu HL, Gulo DP, Han S, Tong L. Deep-Ultraviolet and Helicity-Dependent Raman Spectroscopy for Carbon Nanotubes and 2D Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2308558. [PMID: 38412418 DOI: 10.1002/smll.202308558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/10/2024] [Indexed: 02/29/2024]
Abstract
Recent progress of Raman spectroscopy on carbon nanotubes and 2D materials is reviewed as a topical review. The Raman tensor with complex values is related to the chiral 1D/2D materials without mirror symmetry for the mirror in the propagating direction of light, such as chiral carbon nanotube and black phosphorus. The phenomenon of complex Raman tensor is observed by the asymmetric polar plot of helicity-dependent Raman spectroscopy using incident circularly-polarized lights. First-principles calculations of resonant Raman spectra directly give the complex Raman tensor that explains helicity-dependent Raman spectra and laser-energy-dependent relative intensities of Raman spectra. In deep-ultraviolet (DUV) Raman spectroscopy with 266 nm laser, since the energy of the photon is large compared with the energy gap, the first-order and double resonant Raman processes occur in general k points in the Brillouin zone. First-principles calculation is necessary to understand the DUV Raman spectra and the origin of double-resonance Raman spectra. Asymmetric line shapes appear for the G band of graphene for 266 nm laser and in-plane Raman mode of WS2 for 532 nm laser, while these spectra show symmetric line shapes for other laser excitation. The interference effect on the asymmetric line shape is discussed by fitting the spectra to the Breit-Wigner-Fano line shapes.
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Affiliation(s)
- Riichiro Saito
- Department of Physics, National Taiwan Normal University, Taipei, 11677, Taiwan
- Department of Physics, and Tohoku University, Sendai, 980-8578, Japan
| | - Nguyen Tuan Hung
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, 980-8578, Japan
| | - Teng Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P. R. China
| | - Jianqi Huang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P. R. China
| | - Hsiang-Lin Liu
- Department of Physics, National Taiwan Normal University, Taipei, 11677, Taiwan
| | | | - Shiyi Han
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Lianming Tong
- College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
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Vertically aligned 1T-WS2 nanosheets supported on carbon cloth as a high-performance flexible photocatalyst. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Liu HL, Yang T, Chen JH, Chen HW, Guo H, Saito R, Li MY, Li LJ. Temperature-dependent optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text]: spectroscopic ellipsometry and first-principles calculations. Sci Rep 2020; 10:15282. [PMID: 32943656 PMCID: PMC7498615 DOI: 10.1038/s41598-020-71808-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 08/03/2020] [Indexed: 11/22/2022] Open
Abstract
The temperature-dependent ([Formula: see text]) optical constants of monolayer [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] were investigated through spectroscopic ellipsometry over the spectral range of 0.73-6.42 eV. At room temperature, the spectra of refractive index exhibited several anomalous dispersion features below 800 nm and approached a constant value of 3.5-4.0 in the near-infrared frequency range. With a decrease in temperature, the refractive indices decreased monotonically in the near-infrared region due to the temperature-dependent optical band gap. The thermo-optic coefficients at room temperature had values from [Formula: see text] to [Formula: see text] for monolayer transition metal dichalcogenides at a wavelength of 1200 nm below the optical band gap. The optical band gap increased with a decrease in temperature due to the suppression of electron-phonon interactions. On the basis of first-principles calculations, the observed optical excitations at 4.5 K were appropriately assigned. These results provide basic information for the technological development of monolayer transition metal dichalcogenides-based photonic devices at various temperatures.
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Affiliation(s)
- Hsiang-Lin Liu
- Department of Physics, National Taiwan Normal University, Taipei, 11677 Taiwan
| | - Teng Yang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016 China
- Department of Physics, Tohoku University, Sendai, 980-8578 Japan
| | - Jyun-Han Chen
- Department of Physics, National Taiwan Normal University, Taipei, 11677 Taiwan
| | - Hsiao-Wen Chen
- Department of Physics, National Taiwan Normal University, Taipei, 11677 Taiwan
| | - Huaihong Guo
- Department of Physics, Tohoku University, Sendai, 980-8578 Japan
- College of Sciences, Liaoning Shihua University, Fushun, 113001 China
| | - Riichiro Saito
- Department of Physics, Tohoku University, Sendai, 980-8578 Japan
| | - Ming-Yang Li
- Research Center for Applied Science, Academia Sinica, Taipei, 10617 Taiwan
- Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
| | - Lain-Jong Li
- Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, 23955-6900 Kingdom of Saudi Arabia
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de Souza B, Farias G, Neese F, Izsák R. Efficient simulation of overtones and combination bands in resonant Raman spectra. J Chem Phys 2019; 150:214102. [DOI: 10.1063/1.5099247] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Bernardo de Souza
- Departmento de Química, Universidade Federal de Santa Catarina, Santa Catarina, Brazil
| | - Giliandro Farias
- Departmento de Química, Universidade Federal de Santa Catarina, Santa Catarina, Brazil
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - Róbert Izsák
- Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany
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