1. Exploring the possible interlinked structures in single-wall carbon nanotubes under pressure by Raman spectroscopy.
- Author
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Lu, Shuangchen, Yao, Mingguang, Li, Quanjun, lv, Hang, Liu, Dedi, Liu, Bo, Liu, Ran, Jiang, Linhai, Yao, Zhen, Liu, Zhaodong, Zou, Bo, Cui, Tian, and Liu, Bingbing
- Abstract
High-pressure Raman measurements on single-wall carbon nanotubes (SWNTs) have been carried out in a diamond anvil cell by using two wavelength lasers: 830 and 514.5 nm. Irrespective of using a pressure transmitting medium (PTM) or not, we found that nanotubes undergo similar transformations under pressure. The pressure-induced changes in Raman signals at around 2 and 5 GPa are attributed to the nanotube cross-section transitions from circle to ellipse and then to a flattened shape, respectively. Especially with pressure increasing up to 15-17 GPa, we observed that the third transition takes place in both the Raman wavenumber and the linewidth of G-band. We propose explanations that the interlinked configuration with sp
3 bonds forms in the bundles of SWNTs under pressure, which was the cause for the occurrence of those Raman anomalies, similar to the structural-phase transition of graphite above 14 GPa. Our TEM observations and Raman measurements on the decompressed samples support this transition picture. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]- Published
- 2013
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