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  11. A Sensitive And Selective Electrochemical Detection And Kinetic Analysis Of Methyl Parathion Using Au Nanoparticle-decorated Rgo/cuo Ternary Nanocomposite

A sensitive and selective electrochemical detection and kinetic analysis of methyl parathion using Au nanoparticle-decorated rGO/CuO ternary nanocomposite

N I Nayem1, M Sabbir Hossain1, Md A Rashed1

  • 1Department of Chemistry, Faculty of Science, Mawlana Bhashani Science and Technology University Santosh Tangail 1902 Bangladesh abu.rashed@mbstu.ac.bd.

RSC Advances
|May 12, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

This study presents a novel electrochemical sensor for detecting organophosphorus pesticide residues. The sensor, utilizing copper oxide nanostructures, reduced graphene oxide, and gold nanoparticles, offers high sensitivity and selectivity for methyl parathion detection.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Organophosphorus pesticide (OP) detection is crucial for environmental and public health.
  • Existing methods may lack sensitivity or selectivity.
  • Need for advanced detection techniques for pesticides like methyl parathion (MP).

Purpose of the Study:

  • To develop a novel electrochemical sensor for sensitive and selective MP detection.
  • To synthesize and characterize a nanocomposite material for sensor applications.
  • To evaluate the sensor's performance, including sensitivity, selectivity, and stability.

Main Methods:

  • Fabrication of a nanocomposite using copper oxide (CuO) nanostructures, reduced graphene oxide (rGO), and gold nanoparticles (AuNPs).
  • Synthesis via ultrasonication and photo-reduction without stabilizers.

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  • Electrochemical detection of MP using square wave voltammetry (SWV) on a modified glassy carbon electrode (GCE).

    • Main Results:

    • The Au@rGO/CuO nanocomposite showed uniform morphology.
    • Electrochemical kinetics for MP reduction were diffusion-controlled (α = 0.485).
    • The sensor achieved high sensitivity (3.46 μA μM⁻¹ cm⁻²) and a low limit of detection (0.045 μM).
    • Exceptional selectivity, reproducibility, repeatability, and stability were observed.

    Conclusions:

    • The developed electrochemical sensor demonstrates high performance for MP detection.
    • The Au@rGO/CuO nanocomposite is a promising material for developing effective electrocatalysts.
    • This method contributes to advancements in pesticide residue monitoring.