Facile synthesis of TiO2@PANI@Au nanocomposite as an electrochemical sensor for determination of hydrazine

Abstract

In this work, a sensitive electrochemical sensor is provided for hydrazine oxidation (HZ), by titanium oxide@polyaniline@gold nanoparticles (TiO2@PANI@Au) nanocomposite on the glassy carbon electrode (GCE) surface. The modification of sensor was performed by chemical and electrochemical synthesis processes. Firstly, TiO2 nanoparticles was chemically synthesized and was placed on the surface of the glassy carbon electrode (TiO2/GCE). The electropolymerization of aniline was done on the TiO2/GCE (TiO2@PANI/GCE). Finally, gold nanoparticles were deposition on TiO2@PANI/GCE by cyclic voltammetry and TiO2@PANI@Au nanocomposite was used as sensitive sensor. The characterization of synthesized nanoparticles was investigated by X-ray diffraction (XRD), scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), and electrochemical techniques. The proposed sensor display high electrocatalytic activity to hydrazine oxidation. Differential pule voltammetry technique was used to construct the calibration graph for hydrazine under optimized conditions. The limit of detection 0.15±0.02 μM and linear range 0.9 × 10−6 M to 1.2 × 10−3 M for hydrazine were calculated. The results also showed that TiO2@PANI@Au/GCE nanosensor, has good stability, repeatability and, repeatability in hydrazine measurements. The proposed sensor was also successfully used for determination of hydrazine in different water samples.