4.5 Article

The study of novel Fe3O4@γ-Fe2O3 core/shell nanomaterials with improved properties

期刊

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 321, 期 8, 页码 1052-1057

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ELSEVIER
DOI: 10.1016/j.jmmm.2008.10.022

关键词

Fe3O4@gamma-Fe2O3 core/shell nanomaterials; Calcine; Stability; Magnetic property; Photovoltage response

资金

  1. Jilin provincial science and technology department of China [20060569]

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The surface structure of the iron oxide nanoparticles obtained by the co-precipitation method has been investigated, and a thin layer of alpha-FeOOH absorbed on surface of the nanoparticle is confirmed by analyses of Fourier transform infrared (FTIR), X-ray photoelectron spectra (XPS) and surface photovoltage spectroscopy (SPS). After annealed at 400 degrees C, the alpha-FeOOH can be converted to gamma-Fe2O3. The simple-annealed procedure resulted in the formation of Fe3O4@gamma-Fe2O3 core/shell structure with improved stability and a higher magnetic saturation value, and also the simple method can be used to obtain core/shell structure in other similar system. (C) 2008 Elsevier B.V. All rights reserved.

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