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

In this work, a new Fe 3 O 4 /graphene oxide (GO)/pristine graphene (PG) ternary composite (Fe 3 O 4 /GO/PG) was successfully synthesized. The structure of Fe 3 O 4 /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 Fe 3 O 4 nanoparticles are anchored on the surface of GO/PG composite. A sensor based on this Fe 3 O 4 /GO/PG has been fabricated successfully to detect dopamine (DA) and hydrogen peroxide (H 2 O 2 ). The linear detection ranges for DA and H 2 O 2 are 0.30–30 μM and 0.50–277 μM, respectively, with detection limits of 0.18 and 0.09 μM.