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(b)
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Figure 1: (a) Photographs of bare black binding string and (b) SEM images of bare string before and after one and five dipping cycles with the Prussian blue modified graphite (PB-G). (c) Change in electrical resistance of PB-G coated string according to number of dipping cycles. (d) Cyclic voltammograms of the PB-G coated string electrodes after one and five dipping cycles in 0.5 M KCl solution at a scan rate of 50 mV s−1.