Table 2. Average Equilibrium Constants and Adsorption Gibbs Free Energy for Dopamine and Dopamine-o-quinone at Carbon Nanotube-Grown Microelectrodes and Carbon Fiber Microelectrodea.
| material | βDA (×103) | βDOQ (×103) | βDA/βDOQ | ΔG°DA (kJ/mol) | ΔG°DOQ (kJ/mol) | ΔG°DA/ΔG°DOQ |
|---|---|---|---|---|---|---|
| CNT-Nb | 21 ± 1 | 20 ± 1 | 1.03 ± 0.04 | –24.1 ± 0.1 | –24.0 ± 0.1 | 1.003 ± 0.004 |
| CNT-Ta | 23 ± 3 | 23 ± 5 | 1.05 ± 0.09 | –24.4 ± 0.3 | –24.3 ± 0.4 | 1.003 ± 0.009 |
| CNT-CF | 37 ± 4 | 31 ± 2 | 1.10 ± 0.02 | –25.6 ± 0.2 | –25.1 ± 0.1 | 1.014 ± 0.005 |
| CFME | 39 ± 1 | 32 ± 1 | 1.23 ± 0.04 | –25.9 ± 0.1 | –25.2 ± 0.1 | 1.019 ± 0.003 |
a
All n = 5. Errors are standard error of the mean.