Graphene sheets (GS)@manganic manganous oxide (Mn3O4) nanocomposites were prepared via a simple solvothermal process. GS@Mn3O4/nafion (Nf) film modified glassy carbon electrode (GCE) was fabricated and applied for the detection of dopamine (DA) without the interference of ascorbic acid (AA) at the low working potential. The prepared nanocomposites (GS@Mn3O4) were characterized by X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR), and the morphology of different electrodes was characterized by scanning electron microsco...