title: Observation of localized strains on vertically grown single-walled carbon nanotube forests via polarized Raman spectroscopy.
abstract: 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.
authors: Department of Physics, Chung-Ang University, Seoul, 156-756, Korea.
authors: June
authors: J
authors: Park
authors: Kwang
authors: K
authors: Heo
authors: Seunghun
authors: S
authors: Hong
authors: Yo-Sep
authors: YS
authors: Min
authors: Maeng-Je
authors: MJ
authors: Seong