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Electrochemical characterization of the paper-based biosensor array. (A) Typical cyclic voltammograms of 10 mM K3[Fe(CN)6] in 1 M KCl solution in an electrochemical biosensing module of the array device at various scan rates. (B) A plot of the cathodic peak current ipc versus the square root of the scan rate ν1/2, measured from the cyclic voltammograms (n = 5).
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