An electrochemical dopamine sensor based on the ZnO/CuO nanohybrid structures

Area of Science:

• Nanomaterials Science
• Electrochemistry
• Biosensors

Background:

• Dopamine (DA) is crucial for regulating human behavior, making its selective detection vital in medicine.
• Existing methods for dopamine detection face challenges in selectivity and sensitivity.

Purpose of the Study:

• To develop a novel electrode material for the electrochemical detection of dopamine.
• To investigate ZnO/CuO nanohybrid structures for enhanced dopamine sensing capabilities.

Main Methods:

• ZnO/CuO nanohybrid structures were synthesized on gold-coated glass substrates.
• Material characterization was performed using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and X-ray Photoelectron Spectroscopy (XPS).
• Electrochemical detection of dopamine was carried out using cyclic voltammetry (CV) and amperometric experiments.

Main Results:

• The ZnO/CuO nanohybrid structures were successfully synthesized and characterized.
• The amperometric response showed linearity for dopamine concentrations from 1.0 x 10(-3) to 8.0 mM with a sensitivity of 90.9 μA mM(-1) cm(-2).
• The dopamine sensor demonstrated high selectivity over common interferents (glucose, uric acid, ascorbic acid), stability, reproducibility, and a response time under 10 seconds.

Conclusions:

• ZnO/CuO nanohybrid structures serve as a promising electrode material for selective electrochemical dopamine detection.
• The developed dopamine biosensor offers a wide detection range, acceptable sensitivity, and excellent stability, indicating potential for real sample analysis.