Synthesis of three-dimensional network Fe₃O₄ at gas/liquid interface and its sensing application

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• 作者：Yaping He^a ; Qinglin Sheng^a ; Bin Liu^a ; ^b ; Jianbin Zheng^a ; ^{zhengjb@nwu.edu.cn}
• 关键词：Sensing ; Gas/liquid interface ; Electrocatalytic oxidation ; Three-dimensional network magnetic ; Hydrazine hydrate
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 April, 2012
• 卷：66
• 期：Complete
• 页码：82-87
• 文件大小：1059 K

摘要

When free diffusing ammonia begins to dissolve into a reaction precursor solution, a gas/liquid interface formed. Three-dimensional (3D) network iron oxide (i-Fe₃O₄) was synthesized at the interface without the protection of any inert gas at room temperature. This is the first time ammonia vapor method be used to prepare nano iron oxide at a gas/liquid interface. Scanning electron microscope results of it indicated that 3D network i-Fe₃O₄ is an assembly of nanowires and its properties are quite similar to spherical Fe₃O₄ nanoparticle. Energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform infrared spectra were used to confirm the presence of Fe₃O₄. Electrochemical methods were employed to investigate the sensing properties for the electrocatalytic oxidation of hydrazine hydrate at the i-Fe₃O₄/glassy carbon electrode (GCE). The sensor displayed a response time less than 2 s, a sensitivity of 152 渭A mM^鈭? cm^鈭? and the linearity of 0.1 to 600 渭M with a detection limit of 0.05 渭M (S/N = 3).