Design of a nanostructured electromagnetic polyaniline–keggin Iron–Clay composite modified electrochemical sensor for the nanomolar detection of Ascorbic acid

Abstract

This article demonstrates the design and fabrication of an electrochemical sensor based on a platinum electrode for ascorbic acid (AA) modified by an electromagnetic polyaniline–Keggin iron–clay (PPICS) composite. The polyaniline–polyhydroxy iron– clay composite was prepared by the polymerization of [Anilinium]1[PDPSA]2 in the presence of Keggin iron intercalated clay and was characterized for its particle size, morphology, electrical conductivity, and saturation magnetization. The oxidation potential of AA was observed at 10.4 V on the bare electrode and shifted to a negative potential of 20.32 V on the modified electrode. Common possible interferences of the sample matrices were tested, and the results reveal that the PPICS-modified electrode exhibited a high selectivity and sensitivity toward AA. This unique low-cost and user-friendly sensor was validated for the nanomolar detection of AA present in real samples.