Table 4 XPS C 1s peaks of the sound and aged wood surfaces
Carbon type | F-0 (sound) | F-1 | F-2 | F-3 | F-4 | F-5 | F-6 | F-7 | F-8 | |
|---|---|---|---|---|---|---|---|---|---|---|
Binding energy (eV) | C1 | 284.66 | 284.58 | 284.68 | 284.70 | 284.74 | 284.69 | 284.76 | 284.69 | 284.68 |
C2 | 286.25 | 286.24 | 286.30 | 286.40 | 286.38 | 286.32 | 286.40 | 286.35 | 286.31 | |
C3 | 287.80 | 287.74 | 287.93 | 288.03 | 288.10 | 287.83 | 287.98 | 288.11 | 287.93 | |
C4 | 288.80 | 288.85 | 288.80 | 289.01 | 289.00 | 288.82 | 288.95 | 288.95 | 288.80 | |
Area (%) | C1 | 47.78 | 34.87 | 31.67 | 23.16 | 27.10 | 25.79 | 21.39 | 21.31 | 21.27 |
C2 | 44.33 | 54.36 | 52.18 | 58.51 | 52.72 | 61.24 | 56.92 | 47.68 | 56.34 | |
C3 | 5.53 | 7.43 | 9.65 | 11.53 | 12.37 | 8.28 | 17.14 | 23.46 | 14.95 | |
C4 | 2.37 | 3.34 | 6.50 | 6.80 | 7.81 | 4.69 | 4.54 | 7.55 | 7.43 | |
Ratio | 1.09 | 1.87 | 2.16 | 3.32 | 2.69 | 2.88 | 3.68 | 3.69 | 3.70 |