Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 109, Issue 25, Pages 12245-12249Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp051197q
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Bicrystalline nanowires of hematite (alpha-Fe2O3) have been successfully synthesized by the oxidation of pure iron. The product was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM in combination with focal series reconstruction, energy-dispersive X-ray spectroscopy, and electron energy-loss spectroscopy. The bicrystalline nanowires have diameters of 20-80 nm and lengths up to 20 mu m. All of the investigated materials are found to be alpha-Fe2O3 with a rhombohedral crystal structure. Investigations indicate that most of the bicrystalline nanowires are nanotwins with ellipsoidal heads. The orientation relationship between the nanotwins can be described as (1110)(M)// (1110)(T), [110](M)//[110](T). An energy-filtered TEM investigation indicates that the ellipsoidal head is iron-rich. The growth mechanism of such unique nanostructures is considered to be a solid-phase growth via surface and internal diffusions of molecules from base to tip.
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