Table 1.
The values of oxidation potential (EOX), reduction potential (ERED), separation peak (ΔE) for the [Fe(CN)6]3-/4- redox system and electrolyte resistance (Re), constant phase element (CPE), the parameter of constant phase element, exponent (n), and charge transfer resistance (Rct) calculated from the EEQC model.
| SAMPLE | EOX/mV | ERED/mV | ΔE/mV | Re/Ω | CPE/µFΩ−1sn | n | Rct/Ω |
|---|---|---|---|---|---|---|---|
| bare Au | 202 | 108 | 94 | 148 | 41.4 | 0.492 | 190 |
| Au/4-ATP | 201 | 98 | 103 | 153 | 4.1 | 0.704 | 256 |
| Au/4-ATP/anti-Spy | 237 | 72 | 165 | 161 | 2.9 | 0.715 | 446 |
| Au/4-ATP/anti-Spy/BSA | 285 | 52 | 233 | 191 | 1.01 | 0.862 | 1790 |