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 µM) and (250–450 µM) with a limit of detection (LOD) of 0.25 µM and 0.303 µM 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%.

本文提出了一种基于聚噻吩和混合多壁碳纳米管-石墨烯 (PTH/MWCNT-G) 的柠檬黄 (Tz) 的灵敏电化学传感器，通过氧化聚合路线。通过 X 射线衍射 (XRD) 和傅里叶变换红外光谱 (FT-IR) 证实了 PTH/MWCNT-G，并通过扫描电子显微镜 (FE-SEM) 和能量色散 X 射线 (EDX) 研究了形貌和透射电子显微镜 (TEM) 分析。扫描速率研究表明，在最佳条件下，Tz 的氧化在扩散控制下是不可逆的。通过方波伏安法 (SWV) 研究了修饰电极的电催化活性，结果显示在 (1–100 µM) 和 (250–450 µM) 范围内的两种线性行为，检测限 (LOD) 为分别为 0.25 µM 和 0.303 µM。该传感器还表现出高稳定性和再现性。通过对软饮料中Tz的检测证实了修饰电极的实际应用，回收率在106.7%~97.87%之间。