Development of a CuFe₂O₄ - Reduced Graphene Oxide-Based Electrochemical Sensor for Malathion

Abstract:

A portable non-enzymatic electrochemical sensor for malathion detection based on CuFe₂O₄ and reduced graphene oxide nanocomposites was developed. CuFe₂O₄-rGO nanocomposites were synthesized using a facile one-pot co-precipitation method. X-ray diffraction, scanning electron microscopy, Fourier-transform infrared spectroscopy, and Raman spectroscopy confirmed successful synthesis of the nanocomposites. Square wave voltammetry was performed using a portable potentiostat (CheapStat) and a three-electrode setup in order to determine the electrochemical behavior of the nanocomposite and its interaction with malathion. Maximum inhibition was observed at conditions corresponding to 15% rGO loading, pH 4 buffer solution, and five-minute accumulation time. Calibration of the sensor established a linear detection range of 0.5-8 ppm and a detection limit of 0.992 ± 0.007 ppm. Altogether, the performance parameters indicate good selectivity and potential applicability of the system for malathion monitoring particularly in agricultural products.

• Periodical: Key Engineering Materials (Volume 841)
• Pages: 41-47
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.841.41
• Online since: May 2020
• Authors: Georgette Anne T. Battad, Jericho G. Estacio, Junel Lawrence C. Indiongco, Marlon L. Mopon Jr.*
• Keywords: Non-Enzymatic Sensor, Organophosphates, Portable Sensor

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