Highly Sensitive Square Wave Voltammetric Determination of Sunset Yellow at a Functionalized‐MWCNTs/poly(Alizarin Red‐S) Composite Modified Electrode

Abstract This work presents an effective and highly sensitive electrochemical detection of Sunset Yellow (SSY) at poly(Alizarin Red‐S) and functionalized multi‐walled carbon nanotubes composite modified glassy carbon electrode ( f ‐MWCNTs/poly(ALR‐S)/GCE). The electrochemical response of the f ‐MWCNTs/poly(ALR‐S)/GCE towards SSY was examined by cyclic voltammetry (CV) and square wave voltammetry (SWV). Both recorded cyclic voltammograms (CVs) and square wave voltammograms (SWVs) showed that the oxidation/reduction peaks of SSY at f‐ MWCNTs/poly(ALR‐S)/GCE were found to be much higher than the bare GCE, f ‐MWCNTs/GCE, and poly(ALR‐S)/GCE. Calibration curves obtained from the SWVs indicated that the f ‐MWCNTs/poly(ALR‐S)/GCE offers a linear response in the range of 0.50 to 256 μM with a low detection limit (LOD) of 0.16 μM and the sensitivity was found to be 9686 μA mM −1 cm −2 . The f ‐MWCNTs/poly(ALR‐S)/GCE provides excellent performance for the detection of SSY in daily life samples with high accuracy and precision.