Magnetic MoS₂ on multiwalled carbon nanotubes for sulfide sensing

Area of Science:

• Materials Science
• Electrochemistry
• Chemical Sensing

Background:

• Sulfide detection is critical in environmental and industrial monitoring.
• Developing sensitive and selective electrochemical sensors is an ongoing challenge.
• Hybrid nanomaterials offer unique properties for enhanced sensor performance.

Purpose of the Study:

• To fabricate a novel Co@CNT/MoS2 modified glassy carbon electrode (GCE) for sensitive sulfide detection.
• To investigate the electrochemical properties and sensing capabilities of the proposed electrode.
• To evaluate the sensor's performance in real-world sample analysis.

Main Methods:

• Fabrication of a hybrid Co@CNT/MoS2 nanocomposite using magnetic traction force.
• Modification of a GCE with the Co@CNT/MoS2 material using Nafion suspension.
• Electrochemical characterization using cyclic voltammetry, linear sweep voltammetry, and amperometric analysis.
• Sulfide detection using amperometric analysis for sensitivity and detection limit determination.

Main Results:

• The Co@CNT/MoS2 modified GCE exhibited excellent electrochemical activity towards sulfide.
• Amperometric analysis demonstrated higher sensitivity compared to other electrochemical methods.
• The sensor achieved a low detection limit of 7.6 nM and a sensitivity of 0.23 mA/μM for sulfide.
• Successful determination of sulfide levels in pretreated fruits with good recovery rates.

Conclusions:

• The Co@CNT/MoS2/GCE is a highly effective electrochemical sensor for sulfide detection.
• The hybrid nanomaterial enhances electrochemical activity and sensor sensitivity.
• The developed sensor shows promise for practical applications in sulfide determination.