Table 2.
XPS chemical state analysis of carbon (C1s).
| Sample | Peak Position | Percentage Contribution | Atomic Concentration | Assignment |
|---|---|---|---|---|
| S1 | 284.76 | 51.61 | 35.55 | C-C |
| 286.74 | 38.39 | 26.44 | C-O | |
| 288.48 | 10.00 | 6.89 | C=O | |
| S2 | 284.79 | 36.05 | 25.49 | C-C |
| 286.75 | 52.26 | 36.96 | C-O | |
| 288.40 | 10.69 | 7.56 | C=O | |
| 290.30 | 0.99 | 0.70 | C=O (OH) | |
| S3 | 284.79 | 59.37 | 40.56 | C-C |
| 286.76 | 31.00 | 21.18 | C-O | |
| 288.74 | 9.62 | 6.57 | C=O | |
| S4 | 284.03 | 3.87 | 3.59 | C=N |
| 284.81 | 54.82 | 51.30 | C-C | |
| 285.44 | 13.99 | 13.09 | C-OH | |
| 286.11 | 8.66 | 8.10 | C-N | |
| 287.06 | 6.51 | 6.08 | carbonyl>C=O | |
| 289.03 | 8.23 | 7.70 | O-C=O | |
| 291.56 | 3.92 | 3.67 | HO-C=O or π–π* satellite |