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This study proposes the development of an electrochemical sensor based on fabrication of a glassy carbon electrode (GCE) with Fe 3 O 4 -polyaniline (Fe 3 O 4 -PANI) nanocomposite, which was further used for enzyme-less detection of 2,4-dichlorophenoxyacetic acid (2,4-D) in aqueous medium. Spectroscopic studies, microstructural studies, and elemental analysis established the formation of Fe 3 O 4 nanoparticles with polyaniline coating. The fabricated Fe 3 O 4 -PANI-GCE was characterized by electrochemical techniques like cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical response of 2,4-D on Fe 3 O 4 -PANI-GCE was evaluated by performing cyclic voltammetry and amperometry experiments. The synergistic effect of the composite causes the superior electrochemical behavior of Fe 3 O 4 -PANI-GCE toward the detection of 2,4-D. Amperometric measurements exhibited a linear concentration range from 1.35 to 2.7 μM. The sensitivity and detection limit were evaluated from the amperometric responses, which were found to be 4.62 × 10 −7 μA μM −1 cm −2 and 0.21 μM, respectively. The electrochemical sensing response could be attributed to adsorption of 2,4-D onto the Fe 3 O 4 -PANImodified GCE (Fe 3 O 4 -PANI-GCE) surface. Fe 3 O 4 -PANI-GCE is found to be a simple, low-cost, and biocompatible non-enzymatic sensor for detection of 2,4-D in aqueous medium at ambient temperature.

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