Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China.
Anal Chim Acta. 2013 Aug 20;792:35-44. doi: 10.1016/j.aca.2013.07.010. Epub 2013 Jul 9.
A nitrite sensor based on Dawson vanodotungstophosphates α2-K7P2VW17O62·18H2O (P2W17V) and carbon nanotubes (CNTs) was prepared by electrostatic layer-by-layer self-assembly technique. The sensor {PEI/PSS/[PDDA/P2W17V-CNTs]n} was characterized by UV-vis spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray photoelectron spectra (XPS). The electron transfer and sensing ability of this sensor were explored using cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) technology. The results show that the incorporation of CNTs and P2W17V into the composite film endowed the modified electrode with fast transfer rate and high electrocatalytic activity towards oxidation of nitrite. This nitrite sensor with 10 bilayers has a broad linear range of 5×10(-8) to 2.13×10(-3)M, a low detection limit of 0.0367μM (SN(-1)=3), a high sensitivity of 0.35mA mM(-1) NO2(-), an excellent anti-interference property in the presence of other potential interfering species and a good stable. It was successfully employed for determination of nitrite in real towards.
基于 Dawson vanodotungstophosphates α2-K7P2VW17O62·18H2O (P2W17V) 和碳纳米管 (CNTs) 的亚硝酸盐传感器是通过静电层层自组装技术制备的。传感器{PEI/PSS/[PDDA/P2W17V-CNTs]n}通过紫外可见光谱、原子力显微镜 (AFM)、扫描电子显微镜 (SEM) 和 X 射线光电子能谱 (XPS) 进行了表征。使用循环伏安法 (CV) 和电化学阻抗谱 (EIS) 技术探索了该传感器的电子转移和传感能力。结果表明，将 CNTs 和 P2W17V 掺入复合膜中，使修饰电极对亚硝酸盐的氧化具有快速的传输速率和高电催化活性。这种具有 10 个双层的亚硝酸盐传感器具有 5×10(-8)至 2.13×10(-3)M 的宽线性范围、0.0367μM（SN(-1)=3）的低检测限、0.35mA mM(-1) NO2(-) 的高灵敏度、在存在其他潜在干扰物质时具有出色的抗干扰性能和良好的稳定性。它成功地用于测定实际样品中的亚硝酸盐。
