A Novel Dopamine Electrochemical Sensor Based on Pt/CNTs-N-S/Electrode

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Dopamine (DA) is vital for human metabolism and its detection is critical for diagnosing various diseases.
• Existing methods for DA detection often lack sensitivity, selectivity, or stability.

Purpose of the Study:

• To develop an innovative composite material for highly sensitive and selective electrochemical detection of dopamine.
• To synthesize and characterize platinum nanoparticle sensors on sulfur and nitrogen-doped multi-walled carbon nanotubes (Pt/CNTs-N-S).

Main Methods:

• Synthesis of sulfur (S) and nitrogen (N) co-doped multi-walled carbon nanotubes (MWCNTs).
• Loading of platinum (Pt) nanoparticles onto the modified MWCNTs to create Pt/CNTs-N-S sensors.
• Electrochemical characterization and performance evaluation for dopamine detection.

Main Results:

• The Pt/CNTs-N-S sensor demonstrated a wide linear detection range for dopamine from 0.0078 to 2 mM.
• Achieved a low limit of detection (LOD) of 0.73 μM for dopamine.
• The sensor exhibited excellent stability and anti-interference capabilities, attributed to N-S co-doping and enhanced electrochemically active surface area (ESCA).

Conclusions:

• The developed Pt/CNTs-N-S sensor offers a sensitive, selective, and stable platform for electrochemical dopamine detection.
• Co-doping MWCNTs with N and S significantly enhances sensor performance.
• This strategy provides a practical approach for developing advanced Pt-based electrochemical sensors for biomedical applications.