Synthesis of Fe3O4/graphene oxide/pristine graphene ternary composite and fabrication electrochemical sensor to detect dopamine and hydrogen peroxide

Synthesis of a novel Fe3O4/GO/PG ternary composite and application to electrochemical sensor. [Display omitted] •A novel ternary composite Fe3O4/GO/PG is successfully prepared by a simple method.•The Fe3O4/GO/PG is used to fabricate electrochemical sensor for rapid detection of dopamine and hydrogen peroxide.•The electrochemical sensor based on Fe3O4/GO/PG exhibits remarkable detection performance. In this work, a new Fe3O4/graphene oxide (GO)/pristine graphene (PG) ternary composite (Fe3O4/GO/PG) was successfully synthesized. The structure of Fe3O4/GO/PG was characterized by transmission electron microscopy (TEM). The TEM result shows that the small PG sheets are attached to the larger GO sheets and the Fe3O4 nanoparticles are anchored on the surface of GO/PG composite. A sensor based on this Fe3O4/GO/PG has been fabricated successfully to detect dopamine (DA) and hydrogen peroxide (H2O2). The linear detection ranges for DA and H2O2 are 0.30–30 μM and 0.50–277 μM, respectively, with detection limits of 0.18 and 0.09 μM.