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| Material | Carbon bonding composition (%) | O : C ratio | |||
|---|---|---|---|---|---|
| C–C/C C | C–O | C O | C(O)(OH) | ||
| GO | 32 | 23 | 24 | 20 | 0.44 |
| PRGO-0 | 57 | 8 | 16 | 20 | 0.42 |
| PRGO-2 | 61 | 7 | 15 | 17 | 0.38 |
| PRGO-4 | 66 | 12 | 18 | 4 | 0.37 |
| PRGO-6 | 68 | 10 | 19 | 3 | 0.31 |
| PRGO-8 | 70 | 10 | 10 | 10 | 0.26 |
| PRGO-10 | 73 | 7 | 10 | 10 | 0.25 |
