LAUSR

An in-situ polymerization route has been applied to obtain polyaniline/Ba bismuthate nanobelt (PAn/BBN) composites with different polyaniline mass percentage. The PAn/BBN composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM) and electrochemical cyclic voltammetry (CV) method. XRD shows that the obtained composites are composed of monoclinic BaBiO2.5 phase. Transmission electron microscopy observations show that the amorphous polyaniline particles with the size of less than 100 nm attach to the surface of the Ba bismuthate nanobelts. The PAn/BBN composites modified glassy carbon electrode (GCE) exhibits good electro-catalytic activity toward tartaric acid (TA). A pair of quasireversible CV peaks are located at -0.69 V and +0.49 V, respectively. The negative shift and increase in the current show that the PAn/BBN composites modified GCE has enhanced electro-catalytic activity toward TA. The influence of the scan rate and electrolyte on the electrochemical responses has also been researched. The limit of detection (LOD) decreases from 0.12 μM to 0.08 μM with increasing the polyaniline mass percentage from 10% to 40%. The PAn/BBN composites modified GCE shows good stability and reproducibility.