LAUSR

Abstract In this paper, Ag@Fe3O4 nanospheres were prepared by a simple solvothermal approach. Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) were used to study the morphology and structure of Ag@Fe3O4. By fixing Ag@Fe3O4 core/shell nanospheres on glassy carbon electrode, a novel non-enzymatic hydrazine sensor was fabricated to catalyze the oxidation of hydrazine. Electrochemical investigations suggested that the sensor had a wonderful electrocatalytic activity for hydrazine oxidation. The catalytic current was linear with the concentration of hydrazine from 0.25 μM to 3.4 mM (R = 0.9984). The detection limit of the sensor was 0.06 μM with a signal-to-noise ratio (S/N) of 3. The sensitivity of the sensor was 270 μΑ mM−1 cm−2, and the response time was 2 s. In addition, the sensor had shown an excellent anti-interference ability, a good reproducibility, and a long-term stability.