Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor 43400, Malaysia.
Department of Science Laboratory Technology, Hussaini Adamu Federal Polytechnic, A2 Kazaure, Nigeria.
Sensors (Basel). 2017 Jul 1;17(7):1538. doi: 10.3390/s17071538.
Carbon nanotubes (CNTs) reinforced with gold nanoparticles (AuNPs) and chitosan nanoparticles (CTSNPs) were anchored on a screen-printed electrode to fabricate a multi-walled structure for the detection of quinoline. The surface morphology of the nanocomposites and the modified electrode was examined by an ultra-high resolution field emission scanning electron microscope (FESEM), and Fourier-transform infrared (FT-IR) spectroscopy was used to confirm the presence of specific functional groups on the multi-walled carbon nanotubes MWCNTs. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were used to monitor the layer-by-layer assembly of ultra-thin films of nanocomposites on the surface of the electrode and other electrochemical characterizations. Under optimized conditions, the novel sensor displayed outstanding electrochemical reactivity towards the electro-oxidation of quinoline. The linear range was fixed between 0.0004 and 1.0 μM, with a limit of detection (LOD) of 3.75 nM. The fabricated electrode exhibited high stability with excellent sensitivity and selectivity, specifically attributable to the salient characteristics of AuNPs, CTSNPs, and MWCNTs and the synergistic inter-relationship between them. The newly developed electrode was tested in the field. The Ipa increased with an increase in the amount of quinoline solution added, and the peak potential deviated minimally, depicting the real capability of the newly fabricated electrode.
碳纳米管（CNTs）与金纳米粒子（AuNPs）和壳聚糖纳米粒子（CTSNPs）增强，被固定在丝网印刷电极上，以制造用于检测喹啉的多壁结构。通过超分辨率场发射扫描电子显微镜（FESEM）检查纳米复合材料和修饰电极的表面形态，并且使用傅里叶变换红外（FT-IR）光谱来确认多壁碳纳米管（MWCNTs）上存在特定的功能基团。使用循环伏安法（CV）和线性扫描伏安法（LSV）来监测电极表面上纳米复合材料的超薄层的逐层组装以及其他电化学特性。在优化条件下，新型传感器对喹啉的电氧化表现出出色的电化学反应性。线性范围固定在 0.0004 到 1.0 μM 之间，检测限（LOD）为 3.75 nM。所制造的电极表现出高稳定性，具有出色的灵敏度和选择性，这特别归因于 AuNPs、CTSNPs 和 MWCNTs 的突出特性以及它们之间的协同相互关系。新开发的电极在现场进行了测试。随着加入的喹啉溶液量的增加，Ipa 增加，并且峰电位偏差最小，这描绘了新制造的电极的实际能力。
