Abstract
Background: Copper oxide nanoparticles doped with nonprecious metal species(Ni and Mn)were synthesized. Method: Aglassy carbon electrode (GCE) was modified by drop-casting of nanostructure suspensions, constructing Ni:Cu(OH)2/GCE, Mn:Cu(OH)2/GCEand Cu(OH)2/GCE. Results: The voltammetric oxidation of dopamine (DA) by the constructed electrodes confirmed that the electrocatalytic oxidation of DA is a reversible, pH-dependent, diffusion-controlled process;thebest response was obtained by Mn:Cu(OH)2/GCE. A sensitive calibration graph (0.664μA/μM) was produced for DA in the concentration range of 0.3-10.0 μM, with adetection limitof 79nM using Mn:Cu(OH)2/GCE. Conclusion: The Mn:Cu(OH)2/GCE possessed anaccurate response toward DA with an acceptable selectivity, stabilityand antifouling effect, revealing the applicability of the Mn:Cu(OH)2/GCE for DA analysis in biological samples.
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