Abstract
In this study, we present a method to generate multi-functional nanometre dumbbell structure, which comprises a cobalt magnetic and a gold nanoparticle bridged by target biomarker. Both cobalt magnetic and gold nanoparticles were successfully modified with two different monoclonal antibodies, which will specifically bind to target antigen. ELISA results confirmed that the activities of those antibodies were not lost due to the conjugation to nanoparticles. The formation of dumbbell structure with the presence of target biomarker molecule was demonstrated via scanning electron microscope. The success of this study allows us to apply this featured dumbbell structure into a nanoelectrode device for digital detection of diagnostic biomarker in the next step.