期刊
PHYSICAL REVIEW B
卷 78, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.205411
关键词
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资金
- National Natural Science Foundation of China [10674053, 10574053, 10534010, 10374037]
- Cultivation Fund of the Key Scientific and Technical Innovation Project [2004-295]
- Changjiang Scholar and Innovative Research Team in University [IRT0625]
- National Fund for Fostering Talents of Basic Science [J0730311]
- National Basic Research Program of China [2005CB724400, 2001CB711201]
- Scientific and Technical Development of Jilin Province
- Graduate Innovation Laboratory of Jilin University
- Swedish Research Council
- China Postdoctoral Science Foundation [20070420685]
- Shanghai Postdoctoral Scientific Program [07R214159]
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.
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