Figure 4
Electrochemical characterisation of AuNPs modified microelectrodes.
(a) Image showing the electrochemical setup for characterisation of microelectrodes. (b) Cyclic voltammograms, (c) Nyquist plots for Au microwires with different amount of AuNPs: 0 μl (1), 3 μl (2), 6 μl (3), 12 μl (4). (d) Nyquist plots at different potentials: −50 mV (1), −100 mV (2), −150 mV (3). Inset (c,d): Equivalent circuit Rs – solution resistance, W – Warburg impedance, Rct – charge transfer resistance, CPEpl – constant phase element. Conditions: 0.5 M H2SO4, 100 mV s−1 (b); 50 mM PBS pH 7.4, −50 mV (c) 50 mM PBS pH 7.4, 12 μL of AuNPs (d).
