Amplified Electrochemical Sensor Employing Fe3O4@SiO2/graphene Nanocomposite for Selective Determination of Folic Acid
2020
Mohadeseh Safaei, | Beitollahi, Hadi | Shishehbore, Masoud Reza
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 μM with a detection limit of 0.05 μM. Finally, the Fe₃O₄@SiO₂/GR/SPE was used for the determination of folic acid in real samples.
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