Magnetically Switchable Bioelectrocatalytic System Based on Ferrocene Grafted Iron Oxide Nanoparticles

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• 作者：Ru Peng ; Wenjing Zhang ; Qin Ran ; Cong Liang ; Li Jing ; Siqiu Ye ; Yuezhong Xian
• 刊名：Langmuir
• 出版年：2011
• 出版时间：March 15, 2011
• 年：2011
• 卷：27
• 期：6
• 页码：2910-2916
• 全文大小：924K
• 年卷期：v.27,no.6(March 15, 2011)
• ISSN：1520-5827

文摘

A simple and versatile method for the introduction of redox unites onto the surface of magnetic nanoparticles has been developed based on 鈥渃lick鈥?chemistry. Azide-functionalized Fe₂O₃ magnetic nanoparticles were synthesized and further reacted with ethynylferrocene via Cu(I)-catalyzed azide alkyne 1,3-dipolar cycloaddition (CuAAC) reaction. The functionalized magnetic nanoparticles were characterized using a powder X-ray diffractometer (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscope (FTIR), and vibrating sample magnetometer (VSM). The resulting materials have properties of both magnetism and electrochemistry, and the electrochemical properties of the nanoparticles are dependent on the features of ethynylferrocene, while the magnetic properties remain independent of ethynylferrocene. Because of the magnetism of Fe₂O₃ nanoparticles and the electrocatalytic activity of ferrocene unites, a recyclable, magneto-switchable bioelectrocatalytic system for glucose oxidation in the presence of glucose oxidase is developed by alternate positioning of an external magnet, and the system has a linear response for glucose biosensing over the range of 1.0鈭?0.0 mM.