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Co3O4 and Fe-doped Co3O4 NPs optical band gap values.
| Samples | Eg1 (eV) | Eg2 (eV) |
|---|---|---|
| Co3O4 | 1.95 | 2.96 |
| Fe-doped Co3O4 (0.05 M) | 1.93 | 2.54 |
| Fe-doped Co3O4 (0.1 M) | 1.87 | 2.52 |
| Fe-doped Co3O4 (0.15 M) | 1.54 | 2.51 |
| Fe-doped Co3O4 (0.2 M) | 1.52 | 2.50 |
| Fe-doped Co3O4 (0.25 M) | 1.46 | 2.40 |
