Robust Pt/Au Composite Nanostructures for Abiotic Glucose Sensing

Area of Science:

• Electrochemistry
• Materials Science
• Biomedical Engineering

Background:

• Effective glucose monitoring is crucial for diabetes management and preventing complications.
• Electrochemical sensors offer advantages in cost, size, and portability for wearable devices.
• Enzyme-based glucose sensors suffer from poor stability and high costs.

Purpose of the Study:

• To develop and test a novel gold and platinum composite nanostructured electrode.
• To evaluate its performance as an abiotic electrocatalyst for glucose oxidation.
• To establish a foundation for next-generation durable and affordable glucose biosensors.

Main Methods:

• Fabrication of a gold-platinum composite electrode on a printed circuit board.
• Electrodeposition of porous gold onto gold-plated electrodes.
• Coating with polyaniline decorated with platinum nanoparticles.
• Testing the electrode's electrocatalytic activity for glucose oxidation.

Main Results:

• The composite nanostructured electrode demonstrated high sensitivity to glucose (95.12 ± 2.54 µA mM⁻¹ cm⁻²).
• Achieved sensitivity was nearly double that of porous gold electrodes.
• Exhibited excellent stability in synthetic interstitial fluid over extended testing periods.

Conclusions:

• The developed abiotic electrode shows significant promise for glucose sensing applications.
• It offers a robust, selective, and cost-effective alternative to enzyme-based sensors.
• This work paves the way for advanced, reliable glucose monitoring devices.