A graphene-based electrochemical sensor for sensitive determination of caffeine

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Caffeine detection is crucial in various fields, including food science and clinical diagnostics.
• Development of sensitive and selective electrochemical sensors is an active area of research.
• Graphene's unique properties offer potential for enhanced electrochemical sensing applications.

Purpose of the Study:

• To develop and characterize a highly sensitive electrochemical sensor for caffeine detection.
• To investigate the electrocatalytic activity of graphene in caffeine sensing.
• To evaluate the performance of the developed sensor for caffeine determination.

Main Methods:

• Fabrication of a Nafion-graphene modified glassy carbon electrode (Nafion-Gr/GCE).
• Electrochemical analysis using cyclic voltammetry (CV) and differential pulse voltammetry (DPV).
• Investigation of caffeine's electrochemical behavior on the modified electrode.

Main Results:

• The Nafion-Gr/GCE exhibited excellent electrocatalytic activity towards caffeine.
• Effective accumulation of caffeine on the electrode surface led to a sensitive anodic peak.
• The sensor achieved a low detection limit of 1.2×10⁻⁷ M (S/N=3), with good reproducibility (5.2% RSD) and recovery (98.6%-102.0%).

Conclusions:

• Graphene's unique electronic and adsorptive properties are key to its electrocatalytic performance for caffeine.
• The developed electrochemical sensor provides a simple, sensitive, and reliable method for caffeine determination.
• This sensor shows significant potential for practical applications in caffeine analysis.