Abstract
This paper presents a sensitive electrochemical sensor for Tartrazine (Tz) based on polythiophene and mixed Multi-walled carbon nanotube-graphene (PTH/MWCNT-G) via the oxidative polymerization route. The PTH/MWCNT-G was confirmed by X-ray diffraction (XRD) and Fourier transform infrared spectra (FT-IR), and the morphology was studied via scanning electron microscopy (FE-SEM) and energy dispersive X-ray (EDX) and transmission electron microscope (TEM) analyses. The scan rate study indicated that the oxidation of Tz under optimum conditions was irreversible with diffusion control. The electrocatalytic activities of the modified electrode were studied by square wave voltammetry (SWV), and the results showed two linear behavior in the range of (1-100 mu M) and (250-450 mu M) with a limit of detection (LOD) of 0.25 mu M and 0.303 mu M respectively. The sensor also exhibited high stability and reproducibility. The practical application of the modified electrode was confirmed by the detection of Tz in a soft drink, and the recovery was between 106.7% and 97.87%.