基于石墨烯量子点修饰电极的亚硝酸根电化学传感器

摘要

文章将石墨烯量子点(GQDs)固载在裸玻碳(GC)电极表面形成石墨烯量子点修饰膜,制备亚硝酸根(NO2-)电化学传感器.利用透射电镜(TEM)和X-射线衍射(XRD)对石墨烯量子点材料进行表征;采用循环伏安(CV)、差分脉冲伏安(DPV)和电流-时间曲线(I-T)技术研究NO2-在石墨烯量子点修饰电极表面的电化学行为.实验结果表明,该电化学传感器对NO2-具有良好的电催化氧化性,在1~29μmol/L浓度范围呈现良好的线性关系,检出限为3.33×10-7 mol/L(S/N=3).该电化学传感器具有较宽的检测范围、低的检出限、好的选择性.%Material of grapheme quantum dots was dropped on the surface of glassy carbon electrode to form its film, and nitrite (NO2-) electrochemical sensor was prepared. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) were utilized to characterize grapheme quantum dots (GQDs). Meanwhile, electrochemical behavior of nitrite was researched by cyclic voltammetry (CV), differential pulse voltammetry(DPV)and current-time curve (I-T) on the surface of modified electrode. The experimental results show that electrochemical sensor exhibits a good electrocatalysis to NO2- and possesses a broad linear range in 1~29 μmol/L with detection limit of 3.33×10-7 mol/L (S/N=3). The electrochemical sensor shows the characteristics of wide detection range, low detection limit and good stability.