Nonenzymatic glucose sensor based on over-oxidized polypyrrole modified Pd/Si microchannel plate electrode

Area of Science:

• Electrochemistry
• Materials Science
• Sensor Technology

Background:

• Glucose detection is crucial for diabetes management.
• Existing nonenzymatic glucose sensors often face challenges with sensitivity, selectivity, and interference.

Purpose of the Study:

• To develop a novel silicon microchannel plate (MCP) array electrode modified with over-oxidized polypyrrole (OPPy) for enhanced glucose detection.
• To evaluate the electrochemical performance, sensitivity, selectivity, and stability of the fabricated electrode.

Main Methods:

• Fabrication of a silicon MCP array electrode.
• Modification of the electrode surface with over-oxidized polypyrrole (OPPy).
• Characterization using X-ray diffraction (XRD) and scanning electron microscopy (SEM).
• Electrochemical evaluation of glucose oxidation at a potential of +0.08 V.

Main Results:

• The OPPy-modified silicon MCP array electrode demonstrated high electrocatalytic activity and selectivity for glucose oxidation.
• Achieved a sensitivity of 0.37 mA mM(-1) cm(-2) and a low detection limit of 2.06 μM.
• Exhibited a wide linear detection range up to 24 mM with a high correlation coefficient (0.997).
• The OPPy film effectively minimized interference from common coexisting substances.

Conclusions:

• The developed OPPy-modified silicon MCP array electrode is a promising platform for sensitive and selective nonenzymatic glucose detection.
• Its robustness against interfering substances indicates potential for real-world applications in glucose monitoring.