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|Title:||Synthesis of α-Fe2O3 Templates via Hydrothermal Route and Fe3O4 Particles Through Subsequent Chemical Reduction|
|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. https://doi.org/10.1166/sam.2013.1573|
|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|
|Appears in Collections:||Staff Publications|
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