Sensitive detection of acetaminophen based on Fe3O4 nanoparticles-coated poly(diallyldimethylammonium chloride)-functionalized graphene nanocomposite film

► Fe3O4 nanoparticles-coated PDDA-functionalized graphene nanocomposite was fabricated. ► Fe3O4-PDDA-G/GCE greatly enhanced the electrochemical response of acetaminophen. ► Acetaminophen can be detected with wide linear range and a low detection limit. ► Fe3O4-PDDA-G/GCE can be applied in real samples analysis.