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Cyclic voltammograms (A) and Nyquist curves (B) for unmodified glassy carbon electrodes (a) modified with solution containing MWCNTs-AuNPs (b) MWCNTs-AuNPs/CS-AuNPs (c) and MWCNTs-AuNPs/CS-AuNPs/rGO-AuNPs (d), at a scan rate of 100 mV/s. KCl 0.1 M and K3Fe (CN)6 and K4Fe (CN)6 3.0 mM.
