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XPS data of the C1s carbon peak from fitted Voigt profiles of PP60 before and after plasma treatment with different working gases.
| Working Gas | C–C/at% | C–O/at% | C=O/at% | O–C=O/at% |
|---|---|---|---|---|
| Reference | 96.5 | 3.5 | ||
| Nitrogen (Ar/N2) | 78.8 | 8.6 | 5.0 | 7.6 |
| Oxygen (Ar/O2) | 79.9 | 8.1 | 5.0 | 7.0 |
| Syn. air | 80.3 | 8.0 | 4.8 | 6.9 |
