Table 1.
Characterization of AuNPs on GC modified electrodes for different numbers of cyclic scans (N) during the electrodeposition step. Experimental conditions: 10 mM Fe(CN)63−/4− in 50 mM TRIS buffer pH 7.4 with 0.1 M KCl for electroactive area (AEA), real surface area (Areal), electron transfer rate constant (k0) and roughness factor (ρ) determination; 0.5 M H2SO4 at a scan rate of 100 mV s−1, for Areal determination.
| Scan Numbers (N) | AEA/cm2 | Areal/cm2 | k0app/10−2 cm s−1 | Roughness Factor (ρ) |
|---|---|---|---|---|
| 0 | 0.09 ± 0.01 | - | 4.6 ± 0.1 | 1.3 ± 0.1 |
| 5 | 2.72 ± 0.21 | 2.93 ± 0.07 | 5.2 ± 0.3 | 38.5 ± 0.3 |
| 10 | 3.92 ± 0.12 | 4.13 ± 0.06 | 7.9 ± 0.4 | 55.5 ± 0.3 |
| 15 | 4.13 ± 0.19 | 4.46 ± 0.06 | 13.4 ± 0.6 | 58.5 ± 0.5 |
| 20 | 8.74 ± 0.25 | 9.26 ± 0.04 | 18.2 ± 0.7 | 123.8 ± 0.8 |
| 25 | 12.96 ± 0.18 | 13.83 ± 0.04 | 26.8 ± 0.3 | 183.6 ± 1.2 |
| 30 | 4.18 ± 0.06 | 4.39 ± 0.08 | 15.3 ± 0.8 | 59.2 ± 0.7 |
| 35 | 3.26 ± 0.12 | 3.99 ± 0.06 | 10.6 ± 0.5 | 46.2 ± 1.3 |