School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China.
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
Sensors (Basel). 2018 Jun 12;18(6):1911. doi: 10.3390/s18061911.
TiO₂-reduced graphene oxide composite-modified glassy carbon electrodes (TiO₂⁻ErGO⁻GCE) for the sensitive detection of tartrazine were prepared by drop casting followed by electrochemical reduction. The as-prepared material was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Cyclic voltammetry and second-order derivative linear scan voltammetry were performed to analyze the electrochemical sensing of tartrazine on different electrodes. The determination conditions (including pH, accumulation potential, and accumulation time) were optimized systematically. The results showed that the TiO₂⁻ErGO composites increased the electrochemical active area of the electrode and enhanced the electrochemical responses to tartrazine significantly. Under the optimum detection conditions, the peak current was found to be linear for tartrazine concentrations in the range of 2.0 × 10⁻2.0 × 10 mol/L, with a lower detection limit of 8.0 × 10 mol/L (S/N = 3). Finally, the proposed TiO₂⁻ErGO⁻GCEs were successfully applied for the detection of trace tartrazine in carbonated beverage samples.
TiO₂-还原氧化石墨烯复合修饰玻碳电极（TiO₂⁻ErGO⁻GCE）通过滴铸法和电化学还原法制备，用于灵敏检测柠檬黄。所制备的材料通过透射电子显微镜（TEM）和 X 射线衍射（XRD）进行了表征。通过循环伏安法和二阶导数线性扫描伏安法分析了不同电极上柠檬黄的电化学传感。系统优化了测定条件（包括 pH 值、积累电位和积累时间）。结果表明，TiO₂⁻ErGO 复合材料增加了电极的电化学活性面积，显著增强了对柠檬黄的电化学响应。在最佳检测条件下，柠檬黄浓度在 2.0 × 10⁻2.0 × 10 mol/L 范围内的峰电流呈线性，检测限低至 8.0 × 10 mol/L（S/N = 3）。最后，将所提出的 TiO₂⁻ErGO⁻GCE 成功应用于碳酸饮料样品中痕量柠檬黄的检测。
