An Amperometric Sensor for Thiocholine Based on Cluster-Assembled Zirconia Modified Electrodes

Area of Science:

• Electrochemistry
• Nanomaterials Science
• Biosensor Technology

Background:

• Electrochemical detection of thiocholine is crucial for various applications, including environmental monitoring.
• Developing sensitive and efficient electrode materials is key to improving biosensor performance.

Purpose of the Study:

• To fabricate and characterize cluster-assembled nanostructured zirconia electrodes for electrochemical thiocholine detection.
• To evaluate the performance of these electrodes for biosensing applications.

Main Methods:

• Supersonic Cluster Beam Deposition of zirconia nanostructures on gold films.
• Electrochemical characterization using cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry.
• Assessment of electrode performance with Potassium ferricyanide/Potassium ferrocyanide redox couple and thiocholine detection.

Main Results:

• Nanostructured zirconia electrodes exhibited high active surface area, double-layer capacitance, and suitable charge transfer resistance.
• Electrode performance was enhanced for deposited layers thicker than 60 nm.
• A good electrochemical response for thiocholine oxidation was achieved, with a limit of detection between 0.25 μM and 1.3 μM.

Conclusions:

• Cluster-assembled nanostructured zirconia electrodes are effective for the electrochemical detection of thiocholine.
• These electrodes show promise as functional transducers in biosensing devices for detecting pollutants.