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| Sample name | Content | Binding energy (eV) | Atomic ratio (%) |
|---|---|---|---|
| 8FCOPU | C 1s | 284.96 | 82.14 |
| O 1s | 532.38 | 15.82 | |
| N 1s | 399.94 | 1.60 | |
| F 1s | 687.96 | 0.41 | |
| Sn 3d | 491.64 | 0.04 | |
| 12FCOPU | C 1s | 284.60 | 81.22 |
| O 1s | 532.17 | 17.55 | |
| N 1s | 399.93 | 0.74 | |
| F 1s | 688.8 | 0.45 | |
| Sn 3d | 486.97 | 0.04 | |
| 16FCOPU | C 1s | 284.24 | 79.6 |
| O 1s | 531.87 | 17.43 | |
| N 1s | 399.52 | 1.89 | |
| F 1s | 688.05 | 1.03 | |
| Sn 3d | 494.68 | 0.05 |
