Quantitative detection of nitrite with N-doped graphene quantum dots decorated N-doped carbon nanofibers composite-based electrochemical sensor
Quantitative detection of nitrite with N-doped graphene quantum dots decorated N-doped carbon nanofibers composite-based electrochemical sensor
复制标题
掺氮石墨烯量子点修饰掺氮碳纳米纤维复合电化学传感器定量检测亚硝酸盐
DOI：
10.1016/j.snb.2017.05.155
复制
发表时间：
2017-11-01
影响因子：
8.4
通讯作者：
You, Tianyan
中科院分区：
文献类型：
--
作者：
Li, Libo;Liu, Dong;You, Tianyan
本文首次报道了一种新型的氮掺杂石墨烯量子点修饰的氮掺杂碳纳米纤维（NGQDs@NCNFs）复合材料及其在构建高灵敏度亚硝酸根电化学传感器中的应用。采用静电纺丝、碳化和一步水热法相结合的方法制备了NGQDs@NCNFs复合材料。该复合材料具有自支撑膜结构和良好的柔韧性，有利于电极的修饰。NGQDs成功地接枝到NCNFs表面，从而避免了NGQDs的大聚集并保持了NGQDs的大的电活性表面积。而NCNFs作为一种新的支持NGQDs的连接和有利于快速电子转移。采用循环伏安法和电化学阻抗谱法研究了NGQDs@NCNFs复合材料的电催化性能。结果表明，基于新型NGQDs@NCNFs复合物开发的电化学亚硝酸根传感器表现出优于先前报道的亚硝酸根传感器的分析性能，例如宽的线性范围（5-300 μ M，R ~（-2）= 0.999; 400-3000 μ M，R-2 = 0.997），低检测限（3 μ M），优异的重现性和选择性，以及良好的检测回收率，用于检测香肠，泡菜，湖水和自来水。这些结果表明NGQDs@NCNFs复合材料是一种有前途的和方便的电化学传感器的制作材料。(C)2017爱思唯尔B. V.保留所有权利。
Herein, we firstly report a novel N-doped graphene quantum dots decorated N-doped carbon nanofibers (NGQDs@NCNFs) composite and its application to construct highly sensitive electrochemical sensor for nitrite determination. The NGQDs@NCNFs composite was prepared by combining electrospinning, carbonization and a facile route of one-step hydrothermal method. The as-prepared composite possessed free-standing film structure and high flexibility, which was favorable for electrode modification. NGQDs successfully grafted on the surface of NCNFs, thus avoiding the large aggregation and maintaining the large electroactive surface area of NGQDs. While the NCNFs acted as a novel support for NGQDs attachment and benefited fast electron transfer. The electrocatalytic performance of the NGQDs@NCNFs composite was evaluated by cyclic voltammetry and electrochemical impedance spectroscopy. It is revealed that the electrochemical nitrite sensor developed based on the novel NGQDs@NCNFs composite exhibited superior analysis performance to previously reported nitrite sensors, such as wide linear range (5-300 mu M, R-2 = 0.999; 400-3000 mu M, R-2 = 0.997), low detection limit (3 mu M), excellent reproducibility and selectivity, and good testing recoveries for the detection of nitrite present in sausage, pickle, lake water and tap water. These results suggest that NGQDs@NCNFs composite could be a promising and convenient material for the fabrication of electrochemical sensors. (C) 2017 Elsevier B.V. All rights reserved.