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The influence of the oxidation method on the oxygen content in the GO.
| Oxidation Method | Material | Ratio C/O | [Ref.] |
|---|---|---|---|
| Brodie | natural graphite (Ceylon) | 3.5 | [3] |
| Staudenmaier | natural graphite | 2.9 | [4] |
| Hofmann | natural graphite | 3.3 | [5] |
| Hummers (various) | natural graphite with variable grain sizes smaller than 60 and at 60–90 µm | (16.0–2.0) | [6] |
| Hummers–Offemann | natural graphite | 3.0 | [7,8] |
