Table 1.
Cyclic voltammetric data obtained for the modified electrodes in 5 mM [Fe(CN)6]−3/−4 in 0.1 M PBS.
| Electrode | Ipc (μA) | Ipa(μA) | Ipa/Ipc | Epc (mV) | Epa (mV) | Eo' (mV) | ΔEp (mV) |
|---|---|---|---|---|---|---|---|
| Bare Au | 17.1 | 18.8 | 1.1 | 143.4 | 237.0 | 190.2 | 93.6 |
| Au-CuO (C) | 31.1 | 37.4 | 1.2 | 143.4 | 223.6 | 183.5 | 80.2 |
| Au-CuO (M) | 21.5 | 23.1 | 1.1 | 143.4 | 223.6 | 183.5 | 80.2 |
| Au-Fe2O3 (C) | 20.7 | 23 | 1.1 | 143.4 | 236.0 | 189.7 | 92.6 |
| Au-Fe2O3 (M) | 19.9 | 19.6 | 1.0 | 136.2 | 223.6 | 179.9 | 87.4 |
| Au-Al2O3 (C) | 18.8 | 20.4 | 1.1 | 141.6 | 223.6 | 182.6 | 82.0 |
| Au-Al2O3 (M) | 30.3 | 30.5 | 1.0 | 142.4 | 228.8 | 185.6 | 86.4 |