Raman signature to identify the structural transition of single-wall carbon nanotubes under high pressure
| Autor: | Yonggang Zou, Yuanyuan Hou, Mingxing Jin, Tian Cui, Bertil Sundqvist, Bo Zou, Shoufu Pan, Mingguang Yao, Bingbing Liu, Zhigang Wang, Guangtian Zou, Shidan Yu, Wang Lin |
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| Rok vydání: | 2008 |
| Předmět: |
Nanotube
Materials science Nanotechnology Carbon nanotube Condensed Matter Physics Plateau (mathematics) Molecular physics Electronic Optical and Magnetic Materials law.invention Optical properties of carbon nanotubes Full width at half maximum symbols.namesake law High pressure symbols Compression (geology) Raman spectroscopy |
| Zdroj: | Physical Review B. 78 |
| ISSN: | 1550-235X 1098-0121 |
| Popis: | Raman spectra of single-walled carbon nanotubes (SWNTs) with diameters of 0.6-1.3 nm have been studied under high pressure. A "plateau" in the pressure dependence of the G-band frequencies was observed in all experiments, both with and without pressure transmission medium. Near the onset of the G-band plateau, the corresponding radial breathing mode (RBM) lines become very weak. A strong broadening of the full width at half maximum of the RBMs just before the onset of the G-band plateau suggests that a structural transition starts in the SWNTs. Raman spectra from SWNTs released from different pressures also indicate that a significant structural transition occurs during the G-band plateau process. Simulations of the structural changes and the corresponding Raman modes of a nanotube under compression show a behavior similar to the experimental observations. Based on the experimental results and the theoretical simulation, a detailed model is suggested for the structural transition of SWNTs, corresponding to the experimentally obtained Raman results in the high-pressure domain. |
| Databáze: | OpenAIRE |
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