New Micron-Ring-Disk Electrodes: Fabrication, Characterization, and Applications

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Single-working-electrode systems are limited for simultaneous multi-analyte detection.
• Existing two-working-electrode systems (e.g., rotating ring-disk electrode) have drawbacks like low efficiency and bulkiness.

Purpose of the Study:

• To design and fabricate a simple, low-cost, compact, and user-friendly two-working-electrode system.
• To enable in situ detection of multiple targets with high selectivity.

Main Methods:

• Fabrication of micro-ring-disk electrodes (MRDEs) with tunable disk and ring sizes (5–19 μm).
• Utilizing the dual-electrode structure for selective electrochemical detection.
• Demonstrating selective detection of dopamine (DA) in the presence of ascorbic acid (AA).

Main Results:

• High-performance MRDEs were reliably fabricated using various materials.
• The MRDE system enabled selective detection of DA, even with a fourfold excess of AA.
• Accurate DA detection was achieved by oxidizing AA at the microring electrode.

Conclusions:

• The developed MRDEs offer a practical solution for fabricating advanced two-working-electrode systems.
• MRDEs provide valuable insights for selective and multi-target detection in complex sample matrices.
• This technology enhances electrochemical analysis capabilities for simultaneous analyte detection.