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The surface composition of Ti, O, C, and N obtained from XPS.
| Samples | Content (at. %) | Ratio | |||
|---|---|---|---|---|---|
| Ti 2p | O 1s | C 1s | N 1s | O/Ti | |
| CDT-0.00 | 20.20 | 56.20 | 21.70 | 1.90 | 2.8 |
| CDT-300 | 20.64 | 57.60 | 20.10 | 1.66 | 2.8 |
| CDT-400 | 21.05 | 58.10 | 19.40 | 1.45 | 2.8 |
| CDT-500 | 21.98 | 58.60 | 18.20 | 1.22 | 2.7 |
