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Summary of C 1s XPS spectra fits.
| Peak energy (eV) | Attribution | Relative spectral weight (%) in | ||||
|---|---|---|---|---|---|---|
| EU | EUGL1 | EUGL2 | EUGL3 | GL | ||
| 284.6 | C-C and C-H | 45 | 41 | 41 | 64 | 64 |
| 286.0 | C-OH | 23 | 21 | 17 | 20 | 19 |
| 287.6 | C=O | 10.9 | 14.3 | 12.5 | 7.3 | 6.9 |
| 288.8 | O=C-OH | 18.2 | 19 | 22.7 | 7.2 | 8.2 |
| 291.0 | π-π* | 2.9 | 4.7 | 6.8 | 1.5 | 1.9 |
