Electrochemical sensing and biosensing platform based on chemically reduced graphene oxide

Area of Science:

• Electrochemistry
• Materials Science
• Biotechnology

Background:

• Development of advanced electrode materials is crucial for sensitive electrochemical sensing.
• Graphene oxide (GO) offers unique properties, but its electrochemical applications require modification.
• Chemically reduced GO (CR-GO) presents a promising alternative carbon material for electrode fabrication.

Purpose of the Study:

• To characterize and evaluate a novel chemically reduced graphene oxide modified glassy carbon (CR-GO/GC) electrode.
• To investigate the electrochemical sensing and biosensing capabilities of the CR-GO/GC electrode.
• To compare the performance of CR-GO/GC with conventional graphite/GC and GC electrodes.

Main Methods:

• Fabrication of CR-GO/GC electrodes.
• Electrochemical characterization using various electroactive compounds (potassium ferricyanide, DNA bases, H2O2, NADH, dopamine, ascorbic acid, uric acid, acetaminophen).
• Evaluation of CR-GO/GC for DNA base detection (ssDNA, dsDNA) and enzyme-based biosensing (glucose, ethanol).

Main Results:

• CR-GO/GC electrodes exhibited superior electron transfer kinetics compared to graphite/GC and GC electrodes.
• Significantly enhanced electrochemical reactivity for DNA bases, H2O2, and NADH was observed.
• CR-GO/GC-based bioelectrodes demonstrated improved analytical performance for glucose and ethanol detection.

Conclusions:

• CR-GO/GC is a robust and advanced carbon electrode material with high electrochemical activity.
• The material holds great promise for the design of sensitive electrochemical sensors and biosensors.
• CR-GO/GC enables label-free electrochemical detection of DNA hybridization and damage, and improved enzyme-based biosensing.