▎ 摘　　要

In the present work, Fe3O4@SiO2 decorated on graphene (Fe3O4@SiO2/GR) nanocomposite was successfully synthesized. The voltammetric sensor was used for electrochemical determination of folic acid. Its electrochemical behaviour was investigated by cyclic voltammetry, chronoamperometry and differential pulse voltammetry. The voltammetric data obtained confirm the significant enhancement of oxidation current and reduction overvoltage for electro-oxidation of folic acid at the surface of Fe3O4@SiO2/GR/screen-printed electrode (SPE). Differential pulse voltammetry response shows the linear increment of oxidation signal with an increase in the concentration of folic acid in the range of 0.1-600.0 mu M with a detection limit of 0.05 mu M. Finally, the Fe3O4@SiO2/GR/SPE was used for the determination of folic acid in real samples.