Tunable Raman spectroscopy study of CVD and peapod-derived bundled and individual double-wall carbon nanotubes

Article

关键词: OPTICAL-TRANSITION ENERGIES;    MODE;    BUCKYPAPER;    SCATTERING;    DIAMETERS;    PURITY;    DWCNTS;    TUBES;   

DOI  :  10.1103/PhysRevB.82.155416

来源: SCIE

【 摘 要 】

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 omega(RBM) vs d(t) relationship of the form omega(RBM)=A/d(t) + 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 omega(RBM) 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.

【 授权许可】

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