A label-free electrochemical biosensor based on a bimetallic organic framework for the detection of carbohydrate antigen 19-9

A novel electrochemical immune sensor for sensitive detection of CA19-9 was constructed based on rGO@Ce-MOF-on-Fe-MOF@TB nanocomposites, which achieved a wide linear range (1–100 000 mU mL −1 ) and a low detection limit (0.34 mU mL −1 ).