Open AccessFe3O4-Polyaniline Nanocomposite for Non-enzymatic Electrochemical Detection of 2,4-Dichlorophenoxyacetic Acid
Author(s) -
Bhanita Goswami,
Debajyoti Mahanta
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c00983
Subject(s) - polyaniline , amperometry , dielectric spectroscopy , cyclic voltammetry , detection limit , nanocomposite , materials science , electrochemistry , electrochemical gas sensor , nuclear chemistry , aqueous solution , electrode , chemical engineering , chemistry , nanotechnology , chromatography , polymer , composite material , organic chemistry , polymerization , engineering
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 -PANI-modified 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.