By Satoru Suzuki
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Additional info for Physical and Chemical Properties of Carbon Nanotubes
Resonant Raman spectroscopy is one of the most powerful tools for characterizing structural and electronic properties of SWCNTs . In the Raman spectra, defect-induced phonon mode so-called D band is observed at around 1350 cm−1. The intensity of the D band can be enhanced as the number of defects is increased in the SWCNT. Therefore, the D band has been used for the assessment of imperfection of SWCNTs and the understanding of the properties of their defects. Further finding Raman bands associated with defects can lead the Raman spectroscopy to a more effective tool for the characterization of defects.
2010;49:2331-8. 27 28 Physical and Chemical Properties of Carbon Nanotubes  Pak BC, Cho YI. Hydrodynamic and heat transfer study of dispersed fluids with sub‐ micron metallic oxide particles. Experimental Heat Transfer. 1998;11:151-70.  Xuan Y, Roetzel W. Conceptions for heat transfer correlation of nanofluids. Interna‐ tional Journal of Heat and Mass Transfer. 2000;43:3701-7.  Li Q, Xuan Y. Convective heat transfer and flow characteristics of Cu-water nano‐ fluid. Science in China Series E: Technological Sciences.
The spectral peaks are fitted with Lorentzian lines. 8 nm, which cor‐ responds to typical mean diameter of CoMoCAT ones . Note that the diameter is esti‐ mated using ω [cm−1]=234/d [nm]+10 where d is the SWCNT diameter and ω is the RBM frequency . As shown in Fig. 7, the D band in pristine SWCNTs is fitted with two Lorent‐ zian lines at 1313 and 1355 cm−1 which are denoted by D 1 and D 3, respectively. The relative intensities of the D components to the most intense G peak at 1594 cm−1 in each spectrum are compared in order to clarify the change in the D band.