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

Synthesis of a novel Fe 3 O 4 /GO/PG ternary composite and application to electrochemical sensor. • A novel ternary composite Fe 3 O 4 /GO/PG is successfully prepared by a simple method. • The Fe 3 O 4 /GO/PG is used to fabricate electrochemical sensor for rapid detection of dopamine and hydrogen peroxide. • The electrochemical sensor based on Fe 3 O 4 /GO/PG exhibits remarkable detection performance. 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. [ABSTRACT FROM AUTHOR]