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Voltammetric response of catechol 10-4 M in 0.01 M phosphate buffer pH 7 at an (a) ITO-Tyr (solid line), [(CHI)-(CuPcS)-(CHI)-( AuNPs)]2-Tyr (dashed line), [(CHI)-(AuNPs)-(CHI)-(CuPcS)]2-Tyr (dotted line); and (b) ITO-Lac (solid line), [(CHI)-(CuPcS)-(CHI)-(AuNPs)]2-Lac (dashed line), [(CHI)-(AuNPs)-(CHI)-(CuPcS)]2-Lac (dotted line).
