Core-shell hybrid nanomaterial based on prussian blue and surface active maghemite nanoparticles as stable electrocatalyst

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• 作者：Massimiliano Magro ; Davide Baratella ; Gabriella Salviulo ; Katerina Polakova ; Giorgio Zoppellaro ; Jiri Tucek ; Josef Kaslik ; Radek Zboril ; Fabio Vianello
• 关键词：纬-Fe2O3 ; Iron oxide ; Nanomaterial electrocatalysis ; Superparamagnetic nanoparticles ; Hydrogen peroxide detection ; Prussian blue
• 刊名：Biosensors and Bioelectronics
• 出版年：15 February, 2014
• 年：2014
• 卷：52
• 期：Complete
• 页码：159-165
• 全文大小：1424 K

文摘

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鈭?/sup> 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, M枚ssbauer, 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).}