Enhancement of electrode performance by a simple casting method using sonochemically exfoliated graphene.

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Screen-printed electrodes (SPEs) are widely used in electrochemical sensing.
• Enhancing the electrochemical activity of SPEs is crucial for improving sensor performance.
• Graphene offers excellent electrical conductivity and a high surface area for electrochemical applications.

Purpose of the Study:

• To develop a straightforward method for modifying commercial SPEs with graphene.
• To investigate the electrochemical properties of graphene-modified SPEs.
• To demonstrate the potential of these modified electrodes in sensing applications.

Main Methods:

• Graphene suspensions were synthesized via ultrasonic exfoliation of graphite.
• Surfactants were used to stabilize graphene suspensions, avoiding organic solvents.
• Aqueous graphene suspensions were cast onto commercial SPEs.
• Electrochemical characterization was performed using cyclic voltammetry and impedance spectroscopy.
• Proof-of-concept sensing applications, including heavy metal detection, were explored.

Main Results:

• Graphene modification significantly enhanced the electrochemical activity of SPEs.
• Electron transfer resistance was substantially reduced in modified electrodes.
• The method is simple, cost-effective, and avoids harsh chemicals.
• Successful detection of heavy metals using absorptive stripping voltammetry was demonstrated.

Conclusions:

• Aqueous graphene suspensions offer a viable and effective method for modifying SPEs.
• Graphene-modified SPEs exhibit superior electrochemical performance.
• This approach holds promise for developing advanced electrochemical sensors.