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Nanotechnology. 2014 Jan 17;25(2):025705. doi: 10.1088/0957-4484/25/2/025705. Epub 2013 Dec 12.

Observation of localized strains on vertically grown single-walled carbon nanotube forests via polarized Raman spectroscopy.

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  • 1Department of Physics, Chung-Ang University, Seoul, 156-756, Korea.


Vertically grown single-walled carbon nanotube (V-SWCNT) forests, synthesized by water-assisted plasma-enhanced chemical vapor deposition, were studied using polarized micro-Raman spectroscopy. Among three different sections (root, center and end) along the vertical growth direction, the degree of V-SWCNT alignment was highest in the center section. Raman frequency red-shifts up to 7 and 13 cm(-1), for RBM and G-band, respectively, were observed in the center section, with respect to the Raman frequencies measured in the root and the end sections. Raman frequency downshift and concurrent linewidth broadening of the G-band, revealing a localized strain, were also observed in the center section. The existence of a localized strain in the center section of the V-SWCNT was further confirmed by observing a strong polarization anisotropy of up to 8 cm(-1) in the G-band Raman frequency for different polarized Raman scattering configurations at the same probed spot.

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