Percentage of nitrogen element and amount of amines on GO samples assessed by XPS and the Kaiser test, respectively.
| Sample | %N | Amine (μmol g−1) |
|---|---|---|
| 5a | 0.1 | — |
| 6a | 1.3 | 105 |
| 7a | 1.4 | 75 |
| 5b | 0.2 | — |
| 6b | 1.3 | 99 |
| 7b | 1.4 | 75 |
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