Graphene quantum dot electrochemiluminescence increase by bio-generated H₂O₂ and its application in direct biosensing

Area of Science:

• Electrochemistry
• Biosensors
• Nanomaterials

Background:

• Developing sensitive and selective biosensors is crucial for disease diagnosis and monitoring.
• Electrochemical and chemiluminescent methods offer promising avenues for biosensing applications.

Purpose of the Study:

• To develop a novel signal-increase electrochemiluminescence (ECL) biosensor for glucose detection.
• To utilize graphene quantum dots (GQD) and glucose oxidase (GOx) for enhanced ECL signal generation.

Main Methods:

• Synthesized GQD via a green one-step electrochemical reduction of graphene oxide quantum dot.
• Fabricated a GQD/GOx-based ECL biosensor on Ti foil.
• Investigated the catalytic oxidation of glucose by GOx and direct electron transfer for ECL signal amplification.

Main Results:

• Achieved high sensitivity for glucose detection down to 5 × 10^-6 mol l^-1.
• Demonstrated a wide linear detection range from 5 × 10^-6 to 1.5 × 10^-3 mol l^-1.
• Confirmed the biosensor's applicability to other H₂O₂-generating systems.

Conclusions:

• The developed GQD/GOx ECL biosensor enables direct and sensitive glucose detection.
• The fabrication strategy is adaptable for detecting other biologically relevant targets.
• This work presents a promising platform for advanced biosensing applications.