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

Yao, MingguangState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China (författare)

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.

Wang, Zhigang (författare)
Liu, Bingbing (författare)
Zou, Yonggang (författare)
Yu, Shidan (författare)
Lin, Wang (författare)
Hou, Yuanyuan (författare)
Pan, Shoufu (författare)
Jin, Mingxing (författare)
Zou, Bo (författare)
Cui, Tian (författare)
Zou, Guangtian (författare)
Sundqvist, BertilUmeå universitet,Institutionen för fysik(Swepub:umu)besu0001 (författare)
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaInstitutionen för fysik (creator_code:org_t)

Ingår i:Physical Review B. Condensed Matter and Materials Physics: American Physical Society78:201098-01211550-235X

Av författaren/redakt...: Yao, Mingguang; Wang, Zhigang; Liu, Bingbing; Zou, Yonggang; Yu, Shidan; Lin, Wang; visa fler...; Hou, Yuanyuan; Pan, Shoufu; Jin, Mingxing; Zou, Bo; Cui, Tian; Zou, Guangtian; Sundqvist, Berti ...; visa färre...

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