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(A) Chronoamperograms of GCE/GO-MWCNT-CHT for varying concentrations of adenine (A): 25, 50, and 150 μM in 0.2 M PBS (pH 7.0); (B) plots of anodic peak currents (Ipa) versus t−1/2; (C) plot of the slope of the straight line versus concentration of A.
