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首页> 外文期刊>Journal of Crystal Growth >Surfactant-free Fabrication Of α-fe_2o_3 Structures With Flower-like Morphology In Aqueous Solution
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Surfactant-free Fabrication Of α-fe_2o_3 Structures With Flower-like Morphology In Aqueous Solution

机译：水溶液中无花状形态的α-fe_2o_3结构的无表面活性剂的制备

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摘要

Monodisperse hematite (α-Fe_2O_3) nanostructures with flower-like morphology were obtained by a simple forced hydrolysis and thermal decomposition method without the assistance of any template or organic surfactant. The microstructure of the final flower-like particles was characterized in detail by transmission electron microscopy and selected area electron diffraction, which showed the composite structure of the particle "core". Electron diffraction patterns obtained for sections located on the "leaf of the particles were consistent with hematite single crystals, whereas those obtained for the middle of the particle showed additional spots, due to the presence of goethite in the particle core. Fourier transform infrared spectroscopy and X-ray diffraction also confirmed the presence of goethite phase in the particle. A mechanism based on nucleation-aggregation-recrystallization, which speculated that the goethite precipitates first and then hematite heterogeneously nucleates on goethite particles, was proposed.
机译：通过简单的强制水解和热分解方法，无需任何模板或有机表面活性剂，即可获得具有花状形态的单分散赤铁矿（α-Fe_2O_3）纳米结构。通过透射电子显微镜和选择区域电子衍射对最终花状颗粒的微观结构进行了详细表征，显示了颗粒“核”的复合结构。由于颗粒核中存在针铁矿，在位于“颗粒的叶”上的部分获得的电子衍射图与赤铁矿单晶一致，而在颗粒的中部获得的电子衍射图则显示出额外的斑点。 X射线衍射也证实了针状体中存在针铁矿相，提出了一种基于成核-聚集-再结晶的机理，推测是针铁矿先析出，然后赤铁矿在针铁矿颗粒上异质成核。

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