title: Core-shell hybrid nanomaterial based on prussian blue and surface active maghemite nanoparticles as stable electrocatalyst.
abstract: A novel core-shell nanomaterial based on prussian blue (PB) coating on peculiar surface active maghemite nanoparticles (SAMNs), was developed. The synthetic process involves the direct crystallization of Fe(II)(CN)6(4-) onto the surface of SAMNs by simple incubation in water at controlled pH, demonstrating the presence of under-coordinated Fe(III) on nanoparticle surface. The coating reaction occurs in a narrow pH range and the synthetic procedure was optimized. The resulting SAMN@PB hybrid nanostructures were characterized by transmission and scanning electron microscopy, Mössbauer, UV-vis and FTIR spectroscopy and X-ray powder diffraction. The nanomaterial, characterized by high stability in alkaline media, behave as excellent electro-catalyst for hydrogen peroxide reduction. The stability of SAMN@PB hybrid has been investigated as a function of pH, showing excellent stability up to pH 9.0 and demonstrating the feasibility of SAMNs, superficially derivatized with prussian blue, to produce an efficient and extremely stable nanostructured material. This maghemite supported nanostructured prussian blue was applied to develop a sensor, based on a simple carbon paste electrode, which was able to catalyze the electro-reduction of hydrogen peroxide, in aqueous solutions, buffered at pH 7.0, at low applied potentials (0.0 V vs. SCE).
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Magro
authors.forename: Davide
authors.initials: D
authors.lastname: Baratella
authors.forename: Gabriella
authors.initials: G
authors.lastname: Salviulo
authors.forename: Katerina
authors.initials: K
authors.lastname: Polakova
authors.forename: Giorgio
authors.initials: G
authors.lastname: Zoppellaro
authors.forename: Jiri
authors.initials: J
authors.lastname: Tucek
authors.forename: Josef
authors.initials: J
authors.lastname: Kaslik
authors.forename: Radek
authors.initials: R
authors.lastname: Zboril
authors.forename: Fabio
authors.initials: F
authors.lastname: Vianello
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D002244:Carbon / Q000737:chemistry; D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D005295:Ferrocyanides / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; D005295:Ferrocyanides; C000499:ferric oxide; D002244:Carbon; D006861:Hydrogen Peroxide; C000170:ferric ferrocyanide
keywords: Hydrogen peroxide detection; Iron oxide; Nanomaterial electrocatalysis; Prussian blue; Superparamagnetic nanoparticles; γ-Fe(2)O(3)