Table 2. Chemical Composition from XPS Data.
| samples | C (atomic %) | N (atomic %) | O (atomic %) |
|---|---|---|---|
| PPC-3-500 | 82.32 | 8.82 | 8.86 |
| PPC-3-600 | 84.41 | 7.02 | 8.57 |
| PPC-3-700 | 86.54 | 7.00 | 6.46 |
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