High-Sensitivity Detection of Dichlorvos Using a Multi-Walled Carbon Nanotubes-Gold Nanoparticles/Glassy Carbon Electrode Impedimetric Electrochemical Sensor
Avchukir K. Bakytkarim Y. Mukatayeva Z. Tileuberdi Y. Shadin N. Yenbekova D. Rakhymbay G.
December 2025Engineered Science Publisher
Engineered Science
2025#38
In this study, we report the fabrication of a novel impedimetric electrochemical sensor for the sensitive and reliable detection of the organophosphorus pesticide Dichlorvos (DDVP). The sensor is based on a glassy carbon electrode (GCE) modified with multi-walled carbon nanotubes (MWCNTs) and gold nanoparticles (AuNPs). MWCNTs provide a large surface area, high conductivity, and mechanical stability, while AuNPs enhance electron transfer and adsorption capability. The synergistic combination of these nanomaterials significantly improves the electrodes sensitivity and selectivity. The detection mechanism is based on the inhibition of interfacial electron transfer resulting from the strong interaction between DDVP and the modified electrode surface. This interaction produces measurable impedance changes, allowing indirect quantification of DDVP. The sensor achieved a low detection limit of 18.8nM and a wide linear range of 0.36 - 1.8µM (R² = 0.99), demonstrating excellent reproducibility and reliability. The developed sensor is label-free, cost-effective, and easy to fabricate, making it suitable for large-scale monitoring. Owing to its simplicity and high performance, this system holds great potential for environmental water analysis, agricultural product testing, and food safety assessment, offering an efficient tool for pesticide monitoring and public health protection.
Dichlorvos , Impedimetric electrochemical sensor , Indirect detection , Modified electrode , Nanocomposites
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Center of Physical Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, 96a Tole bi Street, Almaty, 050012, Kazakhstan
Abai Kazakh National Pedagogical University, 13 Dostyk avenue, Almaty, 050010, Kazakhstan
Center of Physical Chemical Methods of Research and Analysis
Abai Kazakh National Pedagogical University
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