Magnetic graphene nanosheets based electrochemiluminescence immunoassay of cancer biomarker using CdTe quantum dots coated silica nanospheres as labels

► A sandwich-type electrochemiluminence immunosensor was fabricated. ► Magnetic graphene nanosheets were synthesized as immunosensing probes. ► CdTe quantum dots coated silica nanospheres were used to amplify signals. ► A home-made injection electrochemiluminence cell was used as reaction chamber.