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Two generic, fast, sensitive and novel electrochemical immunosensors have been developed. Initially, a layer of plasma-polymerized Nafion film (PPF) was deposited on the platinum electrode surface, then positively charged tris(2,2′-bipyridyl)cobalt(III) (Co(bpy) 33+ ) and negatively charged gold nanoparticles were assembled on the PPF-modified Pt electrode by layer-by-layer technique...
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