Self-assembly behavior of layered titanium niobate and methylene blue cation and electrochemical detection of dopamine

摘要

A novel nanocomposite MB/Ti_5NbO_(14) was successfully synthesized by exfoliation/restacking method.The structure and morphology were characterized by X-ray powder diffraction (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV-vis), and Fourier transform infrared (FTIR).It is indicated that materials were successfully synthesized, and MB was successfully intercalated between the layers of [Ti_5NbO_(14)]~(3-) forming a layer with its molecular plane inclined to Ti_5NbO_(14)]~(3-) layer at about 39.88°.Meanwhile, electrochemical measurement demonstrated that MB/Ti_5NbO_(14) nanocomposite exhibited enhanced electrochemical activities towards the oxidation of dopamine due to increased electro-transport properties.And the MB/Ti_5NbO_(14) modified electrode has a detection limit of 2.01 μM (R/N 3.0) with the concentration range from 0.0249 to 0.4988 mM.This study indicated that this electrochemical sensor has satisfactory stability, and detects dopamine with strong anti-interference performance, repeatability, and reproducibility.