The preparation and characterization of Ni–Fe bioxide composite nanoparticles

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• 作者：Qingmei Zhang ; Jian Li ; Yueqiang Lin ; Xiaodong Liu ; Hua Miao
• 关键词：Co-precipitation ; Oxide ; Composite ; Nanoparticles ; FeCl₂ solution
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：22 October 2010
• 年：2010
• 卷：508
• 期：2
• 页码：396-399
• 全文大小：518 K

文摘

Using co-precipitation and processing in FeCl₂ solution, Ni–Fe bioxide composite nanoparticles have been prepared. The precursor and the as-prepared nanoparticles are characterized by TEM, XRD, EDX, XPS and VSM. The precursor, consisting of a mixture of FeOOH and Ni(OH)₂, has been synthesized using the well-known co-precipitation method. Using heat treatment in FeCl₂ solution, at 100 °C, in atmosphere and autoclave, a transition took place in which in addition to the Ni(OH)₂ partially dissolving, the precursor was transformed into Ni₂O₃–Fe₂O₃ composite nanoparticles of about 10 nm diameter. The transition in FeCl₂ solution denoted a transition induced chemical reaction, which is different from the transition induced thermally by calcination technology. In the chemically induced transition, following the dehydration, there is no diffusion of metal ions, as would arise from a thermally induced transition but there is local migration of metal ions to form grains. The chemically induced transition in FeCl₂ solution can be part of a new route for the preparation of composite or single phase oxide nanoparticles by the co-precipitation method.