基于纳米金／石墨烯－壳聚糖－离子液体／L－半胱氨酸包覆CdTe量子点的双酚A传感器

在石墨烯、壳聚糖和1-乙基－3－甲基眯唑四氟硼酸盐（BMIM]）复合材料（Graphene—Chits-BMIM]）表面电沉积金，并自组装L－半胱氨酸包覆CdTe量子点，制备了修饰玻碳电极新型双酚A传感器。采用循环伏安法和电化学交流阻抗等方法研究了修饰电极的电化学特性。由于Graphene-Chits－BMIM]复合材料中，石墨烯和BMIMI都具有良好的导电性，该修饰电极对于双酚A有较好的电流响应。在最佳条件下，该传感器对双酚A的检测浓度范围：5．0×10^-8～7．05×10^-6mol／L，检测限为2．0×10^-8mol／L（3倍信噪比），相关系数为0．999。

Bisphenol A sensor based on Au nanoparticles,graphene/chitosan/ ionic liquid composite and L-cysteine capped quantum dots

A bisphenol A electrochemical sensor was fabricated by immobilizing Au nanoparticles, graphene/ chitosan/ionic liquid composite and L-eysteine capped quantum dots on the surface of glassy carbon electrode. The electrochemical behavior of the BPA sensor was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The sensor exhibits good amperometric response towards bisphenol A（BPA） because of the excellent conductivity of graphene and ionic liquid. Under the optimal experimental conditions, the current is linear with the concentration of BPA in the range from 5.0× 10^-8 to 7.05× 10^-6 tool/L, with a detection limit of 2.0×10^-8 mol/L （S/N = 3） and a correlation coefficient of 0.999.