TY - JOUR
T1 - Tunable Raman spectroscopy study of CVD and peapod-derived bundled and individual double-wall carbon nanotubes
AU - Villalpando-Paez, F.
AU - Moura, L. G.
AU - Fantini, C.
AU - Muramatsu, H.
AU - Hayashi, T.
AU - Kim, Y. A.
AU - Endo, M.
AU - Terrones, M.
AU - Pimenta, M. A.
AU - Dresselhaus, M. S.
PY - 2010/10/8
Y1 - 2010/10/8
N2 - We use 40 laser excitation energies to analyze the differences in the Raman spectra from chemical vapor deposition-derived double-wall carbon nanotube (CVD-DWNT) bundles, fullerene-derived DWNT bundles (C60 -DWNTs), and individual fullerene-derived DWNTs with inner type-I and type-II semiconducting tubes paired with outer metallic tubes. For the radial breathing mode (RBM) of SWNTs, an experimental ωRBM vs dt relationship of the form ωRBM =A/ dt +B is obtained for the inner tubes of DWNT bundles where the A and B constants are found to be close to those obtained by elasticity theory when modeling the elastic properties of graphite. A similar change in ωRBM is observed for an inner type-II semiconducting (6,5) tube and a type-I (9,1) tube when inside various metallic outer tubes. The G-band frequency is observed to upshift when switching the laser resonance from DWNTs with semiconducting inner tubes to DWNTs with metallic inner tubes. Finally, we measure the G⊃′ feature from C 60 -DWNTs and note a downshift in frequency with respect to that of CVD-DWNTs.
AB - We use 40 laser excitation energies to analyze the differences in the Raman spectra from chemical vapor deposition-derived double-wall carbon nanotube (CVD-DWNT) bundles, fullerene-derived DWNT bundles (C60 -DWNTs), and individual fullerene-derived DWNTs with inner type-I and type-II semiconducting tubes paired with outer metallic tubes. For the radial breathing mode (RBM) of SWNTs, an experimental ωRBM vs dt relationship of the form ωRBM =A/ dt +B is obtained for the inner tubes of DWNT bundles where the A and B constants are found to be close to those obtained by elasticity theory when modeling the elastic properties of graphite. A similar change in ωRBM is observed for an inner type-II semiconducting (6,5) tube and a type-I (9,1) tube when inside various metallic outer tubes. The G-band frequency is observed to upshift when switching the laser resonance from DWNTs with semiconducting inner tubes to DWNTs with metallic inner tubes. Finally, we measure the G⊃′ feature from C 60 -DWNTs and note a downshift in frequency with respect to that of CVD-DWNTs.
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U2 - 10.1103/PhysRevB.82.155416
DO - 10.1103/PhysRevB.82.155416
M3 - Article
AN - SCOPUS:78149241180
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 15
M1 - 155416
ER -