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Effects of pH and MB concentration on electrochemical polymerization. Electropolymerization experiments were carried out in different MB buffer solutions. The concentration of MB was fixed at 5 mM, and the pH of the solution was adjusted to 6, 7, 8.5, 9.1 and 9.5, respectively (a). The concentration of MB ranged from 1 to 5 mM under pH 9.2 condition (b) (n = 3).
