Raman signature to identify the structural transition of single-wall carbon nanotubes under high pressure

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Mingguang Yao,¹ Zhigang Wang,^2,3,4 Bingbing Liu,¹ Yonggang Zou,¹ Shidan Yu,¹ Wang Lin,¹ Yuanyuan Hou,¹ Shoufu Pan,^2,3 Mingxing Jin,² Bo Zou,¹ Tian Cui,¹ Guangtian Zou,¹ and B. Sundqvist⁵
¹State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
²Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
³State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
⁴Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China
⁵Department of Physics, Umeå University, 90187 Umeå, Sweden

Received 5 April 2007; revised 28 August 2008; published 10 November 2008

Ramanspectra of single-walled carbon nanotubes (SWNTs) with diameters of 0.6–1.3nm have been studied under high pressure. A “plateau” inthe pressure dependence of the G-band frequencies was observed inall experiments, both with and without pressure transmission medium. Nearthe onset of the G-band plateau, the corresponding radial breathingmode (RBM) lines become very weak. A strong broadening ofthe full width at half maximum of the RBMs justbefore the onset of the G-band plateau suggests that astructural transition starts in the SWNTs. Raman spectra from SWNTsreleased from different pressures also indicate that a significant structuraltransition occurs during the G-band plateau process. Simulations of thestructural changes and the corresponding Raman modes of a nanotubeunder compression show a behavior similar to the experimental observations.Based on the experimental results and the theoretical simulation, adetailed model is suggested for the structural transition of SWNTs,corresponding to the experimentally obtained Raman results in the high-pressuredomain.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.78.205411
DOI:	10.1103/PhysRevB.78.205411
PACS:	61.48.De; 62.50.-p; 31.15.-p; 78.30.-j 61.48.De Structure of carbon nanotubes, boron nanotubes and closely related graphite-like systems 62.50.-p High-pressure effects in solids and liquids 31.15.-p Calculations and mathematical techniques in atomic and molecular physics 78.30.-j Infrared and Raman spectra (condensed matter) YEAR: 2008
KEYWORDS:	carbon nanotubes, high-pressure effects, Raman spectra, solid-state phase transformations

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