Gan Xiaorong, Zhao Huimin, Chen Shuo, Yu Hongtao, Quan Xie
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
Anal Chem. 2015 Jun 2;87(11):5605-13. doi: 10.1021/acs.analchem.5b00500. Epub 2015 May 19.
In the present work, three-dimensional porous HxTiS2 nanosheet-polyaniline (PANI) nanocomposites were first synthesized by a two-step method. First, HxTiS2 ultrathin nanosheets were prepared by the lithium intercalation and exfoliation method, followed by the surface polymerization reactions of aniline. The influences of the amount of HxTiS2 nanosheets on the nanocomposite morphology and electrochemical performances of the nanocomposites modified glass carbon electrode (HxTiS2 nanosheet-PANI/GCE) were investigated. The results demonstrated that the incorporation of HxTiS2 nanosheets as a suitable substrate can regulate the growth of PANI, enhance the electrode stability and improve interfacial electron transfer rates. In addition, based on the nanocomposites, we developed a novel electrochemical sensor to directly detect trace Cu(2+), and discovered that the coordination interaction between Cu(2+) cations and the N atoms of the imine moieties in PANI endowed the electrochemical sensor with high selectivity. Because of the synergetic effects of HxTiS2 nanosheets and PANI, the as-prepared electrochemical sensor exhibited highly sensitive and selective assaying of Cu(2+) with a detection limit of 0.7 nM (signal-to-noise ratio (S/N) equal to 3) and a linear range from 25 nM to 5 μM, under optimal conditions.
在本工作中，首次通过两步法合成了三维多孔HxTiS2纳米片-聚苯胺（PANI）纳米复合材料。首先，通过锂嵌入和剥离法制备了HxTiS2超薄纳米片，随后进行苯胺的表面聚合反应。研究了HxTiS2纳米片的用量对纳米复合材料形态以及纳米复合材料修饰玻碳电极（HxTiS2纳米片-PANI/GCE）电化学性能的影响。结果表明，引入HxTiS2纳米片作为合适的基底可以调节PANI的生长，增强电极稳定性并提高界面电子转移速率。此外，基于该纳米复合材料，我们开发了一种新型电化学传感器来直接检测痕量Cu(2+)，并发现Cu(2+)阳离子与PANI中亚胺部分的N原子之间的配位相互作用赋予了该电化学传感器高选择性。由于HxTiS2纳米片和PANI的协同效应，所制备的电化学传感器在最佳条件下对Cu(2+)表现出高灵敏度和选择性检测，检测限为0.7 nM（信噪比（S/N）等于3），线性范围为25 nM至5 μM。
