Chemical composition of all PCs derived from XPS.
| Samples | XPS (at%) | ||||||
|---|---|---|---|---|---|---|---|
| C | O | N | C1 | C2 | C3 | C4 | |
| PC-300 | 85.8 | 13.7 | 0.5 | 39.9 | 30.6 | 6.9 | 22.6 |
| PC-400 | 66.0 | 33.4 | 0.6 | 40.1 | 35.9 | 7.4 | 16.6 |
| PC-500 | 79.6 | 19.8 | 0.6 | 41.6 | 33.7 | 6.8 | 17.9 |
| PC-600 | 76.2 | 23.2 | 0.6 | 44.9 | 30.8 | 7.5 | 16.8 |
| PC-700 | 78.8 | 20.7 | 0.5 | 47.5 | 30.7 | 7.1 | 14.7 |