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Synthesis of α-Fe2O3 Templates via Hydrothermal Route and Fe3O4 Particles Through Subsequent Chemical Reduction

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FeCl3–NH4H2PO4 system was employed to fabricate α-Fe2O3 nanoparticles by a hydrothermal method. The results showed that the most important factors affecting the size and morphology of as-prepared α-Fe2O3 particles were the reactant concentration and the molar ratio of iron precursor to additives, i.e., [Fe3+]/[H2PO 4]. Besides α-Fe2O3rings and tubes, single-crystalline α-Fe2O3rods with controllable size were successfully fabricated by adjusting the [Fe3+]/[H2PO 4] ratio. The formation mechanism for α-Fe2O3nanocrystals with different shapes was studied. In order to produce Fe3O4particles (in ring, tube or rod shapes), the as-prepared α-Fe2O3particles were employed as templates. Phase conversion from hematite to magnetite was achieved via a chemical reduction method. In this reduction process, both surfactants (oleic acid) and protective gas (5% H2/95% Ar gas mixture) were used as reduction agents. The effect of oleic acid and H2 gas on the reduction process of α-Fe2O3 particles was studied through a series of experiments. The results indicated that the chemical reduction method was convenient and feasible to reduce various hematite templates to corresponding magnetite nanostructures.
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Document Type: Research Article

Publication date: September 1, 2013

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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