Table 1. Diameter, elemental analysis, C: COOH ratio, SSA, ID/IG of CNTs and f-CNTs.
| Sample name | Treatment time (min) | Diameter (nm) | % by weight | C:COOH | SSA (m2/g) | ID/IG | ||
|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| C | O | Ni | ||||||
| CNTs | 0 | 20 ± 5 | 93.5 | 4.90 | 1.60 | N/A | 173.9 | 0.89 |
| f-CNT34.8 | 5 | 23 ± 4 | 91.9 | 6.84 | 1.26 | 34.8 | 220.3 | 1.10 |
| f-CNT23.8 | 10 | 33 ± 7 | 89.9 | 9.65 | 0.45 | 23.8 | 246.8 | 1.29 |
| f-CNT20.6 | 20 | 36 ± 8 | 89.0 | 11.0 | – | 20.6 | 245.7 | 1.36 |
| f-CNT16.2 | 40 | 38 ± 9 | 86.6 | 13.4 | – | 16.2 | 266.0 | 1.61 |
| f-CNT15.7 | 60 | 38 ± 9 | 86.2 | 13.8 | – | 15.7 | 263.2 | 1.60 |
| f-CNT14.9 | 90 | 38 ± 8 | 85.6 | 14.4 | – | 14.9 | 250.6 | 1.62 |
| f-CNT14.7 | 120 | 38 ± 9 | 85.5 | 14.5 | – | 14.7 | 270.9 | 1.59 |
N/A not available