Surfactant-free fabrication of α-Fe₂O₃ structures with flower-like morphology in aqueous solution

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• 作者：Xuehui Liu ; Jianjun Guo ; Yuchuan Cheng ; Yong Li ; Gaojie Xu ; Ping Cui
• 关键词：A1. Nanostructures ; A1. Crystal morphology ; A2. Growth from solutions ; B2. Semiconducting materials
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 出版时间：15 December 2008
• 年：2008
• 卷：311
• 期：1
• 页码：147-151
• 全文大小：959 K

文摘

Monodisperse hematite (α-Fe₂O₃) 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.