Table 1.
XPS analysis of C 1s peak of G and OP-G.
| Bands | G | OP-G |
|---|---|---|
| C–C=C (284.42 eV) | 93.05% | 58.04% |
| C–OH (285.21 eV) | 4.41% | 22.02% |
| C=O (286.52 eV) | 1.89% | 13.37% |
| COOH (288.95 eV) | 0.65% | 6.58% |
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