A novel strategy to create an original nanostructured SPR biosensor with enhanced sensitivity is reported. Iron oxide nanoparticle assemblies with tunable structure and decorated with bio receptors were grafted onto gold thin films by taking advantage of “click” chemistry.
Using the Layer-by-Layer process, we developed a new and original ternary hybrid material based on magnetite iron oxide raspberry nanostructures, 250-300 nm in size, synthesized directly on Few Layer Graphene (Fe 3 O 4 @FLG) alternated with conducting poly(3,4-ethylenedioxy thiophene):poly(styrene sulfonate) (PEDOT:PSS) as electrode material for supercapacitors. Magnetite based nanostructures were used as electroactive materials. Graphene and PEDOT:PSS ensured the electric conductivity. PEDOT:PSS plays also the role of binder conferring a cohesion to the hybrid material. Using spin-coating, the step-by-step buildup leads to very regular and well controlled film properties such as the film thickness and the content in iron oxide. The electrochemical properties of the so obtained hybrid material were investigated in 0.5 M Na 2 SO 3 aqueous electrolyte by cyclic voltammetry, electrochemical impedance spectroscopy and chronopotentiometry. In contradiction with reported poor capacitance and poor cycling stability of iron oxide based supercapacitor, hybrid Fe 3 O 4 @FLG/PEDOT:PSS multilayers provide a high specific capacitance (153 F g -1 at 0.1 A g -1 ) and a high structural and cycling stability (114% retention after 3500 cycles). This hybrid developed system opens the route for even higher specific capacitance using other types of metal oxides.
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