(a) The TPO curve of the raw SWNT material obtained from the thermal pyrolysis of carbon monoxide over catalyst. (b) The TGA profile of the purified SWNT sample. The solid and dashed lines correspond to the weight change and the weight loss derivative , respectively.
The SEM (a) and TEM (b) images of the purified SWNT sample obtained from CO disproportionation on catalyst.
(a) The XPS full survey of the raw, oxidized, and purified SWNT samples. The inset expands the C excitation peaks. (b) X-ray photoemission spectra of single-wall carbon nanotubes at valence band.
The Raman scattering profile of the purified SWNT sample demonstrated several features including the RMB, , , second, and bands.
The RBM bands of the raw, oxidized, and purified SWNT materials excited at different laser energies.
The and bands of the as-produced SWNT sample along with those of that after the preoxidization and purification treatments.
The atomic ratio concentration of the SWNT samples under different stages of purification process. The values in parentheses are the XPS sensitive factors for the corresponding elements. The accuracy of XPS in quantification is 5%–10%.
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