Fabrication of a sensitive electrochemical sensor to environmental pollutant of hydrazine in real water samples based on synergistic catalysis of Ag@C core–shell and polyalizarin yellow R

In the present research, the Ag@C core–shell nanosphere was prepared using hydrothermal technique. The transmission electron microscope (TEM), thermogravimetric analysis (TGA), dynamic light scattering (DLS), scanning electron microscopy (SEM), Zeta potential analysis and Fourier transform-infrared spectroscopy (FTIR) were used in order to characterize Ag@C core–shell. A new electrochemical sensor for the analysis of pollutant hydrazine was suggested based on immobilizing Ag@C core–shell and poly (alizarin yellow R) on glassy carbon electrode (PAYR/Ag@C/GCE). Cyclic voltammetry (CV) and impedimetry were used to corroborate the fabrication of the sensor. To examine the electrocatalytical oxidation properties of this new sensor, cyclic voltammetry and amperometry were used. Based on the results, PAYR/Ag@C showed a great electrocatalytic properties for the determination of hydrazine. The linear range (1 μM–1320 μM), detection of limit (250 nM) and sensitivity (0.0211 μA/μM) were estimated for oxidation peak. This electrode displayed many superiorities such as, high sensitivity, the oxidation of hydrazine at low potential, low detection of limit and application for real samples. [Display omitted] •Synthesis of Ag@C core/shell was performed by hydrothermal method.•The Ag@C core/shell and polyalizarin yellow R modifier was used for modification of GCE.•The electrocatalytic oxidation of hydrazine was done with modified electrode.•The sensor was applied for hydrazine analysis in real samples.