Table 2.
Comparison of SWNT diameters as reported by manufacturer and determined experimentally through Raman spectroscopy
| CNT sample | Reported diameter (nm) | ω̄RBM (cm−1) | Overall average diameter (nm) using different published parameters for C1 and C228 | Determined diameter (nm) with C1 = 223.5 cm−1 · nm, C2 = 12.5 cm−1 |
|---|---|---|---|---|
| SWNT 1 | 1–2 | 154.17 | 1.55 ± 0.13 | 1.58 |
| SWNT 2 | 1.5 | 139.51 | 1.72 ± 0.15 | 1.76 |
| SWNT 3 | 0.8–1.2 | 272.49 | 0.87 ± 0.06 | 0.86 |
| SWNT 4 | 1.2–1.7 | 167.37 | 1.43 ± 0.12 | 1.44 |
| SWNT 5 | 1.2–1.7 | 171.16 | 1.39 ± 0.11 | 1.41 |
| SWNT 6 | 1.2–1.7 | 156.12 | 1.53 ± 0.13 | 1.56 |
Abbreviations: CNT, carbon nanotube; SWNT, single-walled carbon nanotubes; ω̄RBM, frequency of radial vibrations; C1, C2, constants for ω̄RBM = C1/dt + C2.25