The Raman spectrum of the as-obtained carbon microtubes is show in Figure 4, in which a broad peak at 1334 cm-1 as well as a sharp absorption peak at 1600 cm-1 can be clearly seen. The peak at 1334 cm-1 is usually associated with the vibrations of carbon atoms with dangling bonds for the in-plane terminations of disordered graphite and is labeled as the D-band, and the peak at 1600 cm-1 (G-band) (corresponding to the E2g mode) is closely related to the vibration in all sp2 bonded carbon atoms in a 2-dimensional hexagonal lattice, such as in a graphene layer.26,27 The intensity ratio of the D to G band (ID/IG) is calculated to be 0.64, further reflecting the relative disorder and low graphitic crystallinity of the CMTs.
参见： 1. Sadezky A, Muckenhuber H, Grothe H, et al. Raman microspectroscopy of soot and related carbonaceous materials: Spectral analysis and structural information [J]. Carbon, 2005, 43(8): 1731-1742. 2. Sheng C. Char structure characterised by Raman spectroscopy and its correlations with combustion reactivity [J]. Fuel, 2007, 86(15): 2316-2324.
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