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Green synthesis of nonprecious metal-doped copper hydroxide nanoparticles for construction of a dopamine sensor
Masoumeh Ghalkhani1, Azam Anaraki Firooz2, Mina Ghanbari1
1Department of Chemistry, Electrochemical Sensors Research Laboratory, Faculty of Science, Shahid Rajaee Teacher Training University, Lavizan, PO Box 1678815811, Tehran, Iran.
Abstract:
Background: Copper oxide nanoparticles doped with nonprecious metal species (Ni and Mn) were synthesized. Method: A glassy carbon electrode (GCE) was modified by drop-casting of nanostructure suspensions, constructing Ni:Cu(OH)2/GCE, Mn:Cu(OH)2/GCE and 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; the best response was obtained by Mn:Cu(OH)2/GCE. A sensitive calibration graph (0.664 μA/μM) was produced for DA in the concentration range of 0.3-10.0 μM, with a detection limit of 79 nM using Mn:Cu(OH)2/GCE. Conclusion: The Mn:Cu(OH)2/GCE possessed an accurate response toward DA with an acceptable selectivity, stability and antifouling effect, revealing the applicability of the Mn:Cu(OH)2/GCE for DA analysis in biological samples.
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