Kong Fen-Ying, Li Rong-Fang, Yao Lei, Wang Zhong-Xia, Li Heng-Ye, Wang Wen-Juan, Wang Wei
School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, People's Republic of China.
Nanotechnology. 2019 Jul 12;30(28):285502. doi: 10.1088/1361-6528/ab10ac. Epub 2019 Mar 18.
In this paper, a novel electrochemical sensor based on Au nanoparticles/8-aminoquinoline functionalized graphene oxide (AuNPs/GAQ) nanocomposite was developed and tested for the first time for detection of paraquat (PQ). The morphology and composition of AuNPs/GAQ nanocomposite were characterized by various techniques, including transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. Cyclic voltammetry and differential pulse voltammetry were utilized to investigate the electrochemical performances of AuNPs/GAQ nanocomposite modified glassy carbon electrode. The obtained modified electrode exhibited excellent electrocatalytic activity towards detection of PQ. Under the optimized conditions, the proposed sensor showed low detection limit (6 nM, S/N = 3), wide linear range (0.02-24 μM), high selectivity and good stability. In addition, it was successfully applied for detection of PQ in natural water samples with satisfactory results.
本文首次开发并测试了一种基于金纳米颗粒/8-氨基喹啉功能化氧化石墨烯（AuNPs/GAQ）纳米复合材料的新型电化学传感器，用于百草枯（PQ）的检测。采用多种技术对AuNPs/GAQ纳米复合材料的形貌和组成进行了表征，包括透射电子显微镜、傅里叶变换红外光谱、拉曼光谱和X射线光电子能谱。利用循环伏安法和差分脉冲伏安法研究了AuNPs/GAQ纳米复合材料修饰玻碳电极的电化学性能。所得修饰电极对PQ检测表现出优异的电催化活性。在优化条件下，所提出的传感器显示出低检测限（6 nM，S/N = 3）、宽线性范围（0.02 - 24 μM）、高选择性和良好的稳定性。此外，它成功应用于天然水样中PQ的检测，结果令人满意。
