Fig. 3. (A) First cycle of CVs of LbL-ITO electrodes treated with eight deposition cycles of Cu-3G/PLL (pH = 10) in 0.1 M phosphate solution at different pH values as indicated, inset: blown up picture of the current peak attributed to the Cu(ii)/Cu(iii) transition of the surface adsorbed Cu-3G; (B) third cycle of CVs of ITO electrodes with or without Cu-3G/PLL (deposited at pH = 10) in 0.1 M phosphate solution at pH = 10.64 (see legend and text for details); (C) third cycle of CVs of LbL-ITO treated with eight deposition cycles of Cu-2GH/PAH (pH = 10) in 0.1 M phosphate solution at pH = 10.55 (for colour codes see the legend, open circles stand for CPE current after 5 min). Scan rates were 25 mV s^–1 uniformly.