Table 1. Elemental Surface Analysis and C/O Atomic Ratio of Graphene Oxide (GO1), Thermally Reduced at 150 °C × 1 h under Vacuum (GO2), Thermally Reduced GO at 1000 °C × 5 s (GO3), Chemically Reduced GO Using NaBH4 + Ammonia (GO4), and Chemically Reduced GO Using NaBH4 + NaOH (GO5) Samples Determined by XPS.
| sample | treatment | C | O | Na | B | C/O |
|---|---|---|---|---|---|---|
| GO1 | pristine | 69.64 | 30.36 | 2.29 | ||
| GO2 | vacuum reduced (150 °C, 12 h) | 81.97 | 18.03 | 4.55 | ||
| GO3 | thermally reduced (1000 °C, 5 s) | 83.57 | 16.43 | 5.09 | ||
| GO4 | chemically reduced (NaBH4 + NH4OH) | 75.11 | 19.30 | 2.83 | 2.76 | 3.89 |
| GO5 | chemically reduced (NaBH4 + NaOH) | 85.24 | 12.67 | 2.09 | 6.87 |