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| - Enhanced Bioelectrocatalysis Using Au-Nanoparticle/PolyanilineHybrid Systems in Thin Films and Microstructured Rods Assembledon Electrodes
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| - Composite materials consisting of polyaniline/poly(4-styrene-sulfonate) (PAn/PSS) or polyaniline/Aunanoparticles capped with 2-mercaptoethane sulfonic acid (PAn/Au-NPs) are prepared in the form ofthin films (thickness ca. 90 nm) on Au electrodes or in the form of microrods linked to a Au surface. Thecomposite materials in the microrod structures are electrochemically prepared in porous alumina membranescoated with a Au film, followed by the dissolution of the membrane. Chronoamperometric experimentsreveal that the charge transport in the PAn/Au-NPs system is ca. 25-fold enhanced as compared to theanalogous PAn/PSS system. The different polyaniline composite assemblies were used as catalysts forthe electrochemical oxidation of ascorbic acid and as electron-transfer mediators for the bioelectrocatalyticactivation of glucose oxidase (GOx) toward the oxidation of glucose. The PAn/Au-NPs system in themicrorod structure reveals superior function as the catalyst for the electrochemical oxidation of ascorbicacid and in the bioelectrocatalytic activation of GOx because of the high surface area of the assemblyand the enhanced charge-transport properties of the composite material.
- Microrods of the composite material consisting of Au nanoparticles embedded into polyaniline mediate the effective bioelectrocatalytic oxidation of glucose in the presence of glucose oxidase. This originates from the high surface area and improved charge-transport function of the system.
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