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