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Title: Synthesis of α-Fe2O3 Templates via Hydrothermal Route and Fe3O4 Particles Through Subsequent Chemical Reduction
Authors: Yang, Y.
Liu, X.
Ding, J. 
Keywords: Chemical reduction
Hematite (α-Fe2O3)
Hydrothermal method
Magnetite (Fe3O4)
Issue Date: 2013
Citation: Yang, Y., Liu, X., Ding, J. (2013). Synthesis of α-Fe2O3 Templates via Hydrothermal Route and Fe3O4 Particles Through Subsequent Chemical Reduction. Science of Advanced Materials 5 (9) : 1199-1207. ScholarBank@NUS Repository.
Abstract: FeCl3-NH4H2PO4 system was employed to fabricate a-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-Fe2O3 rings and tubes, single-crystalline α-Fe2O3 rods with controllable size were successfully fabricated by adjusting the [Fe3+]/[H2PO- 4] ratio. The formation mechanism for α-Fe2O3 nanocrystals with different shapes was studied. In order to produce Fe3O4 particles (in ring, tube or rod shapes), the as-prepared α-Fe2O3 particles 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. © 2013 by American Scientific Publishers.
Source Title: Science of Advanced Materials
ISSN: 19472935
DOI: 10.1166/sam.2013.1573
Appears in Collections:Staff Publications

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