4.6 Article

Single-crystalline α-Fe2O3with hierarchical structures: Controllable synthesis, formation mechanism and photocatalytic properties

Journal

JOURNAL OF SOLID STATE CHEMISTRY
Volume 182, Issue 5, Pages 1265-1272

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2009.01.041

Keywords

Hematite; Hierarchical structures; Photocatalytic properties

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A dual iron precursors system in a hydrothermal process was developed for controllable fabrication of alpha-Fe2O3 hierarchical structures with different morphologies. Micro-pines, snowflakes and bundles were successfully synthesized simply by tuning the total concentration of the two iron precursors K-4[Fe(CN)(6)] and K-3[Fe(CN)(6)] and their molar ratio. The obtained of alpha-Fe2O3 hierarchical structures were characterized using field-emission scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy and energy-dispersive X-ray analysis. The effect of experimental conditions on the morphologies of the alpha-Fe2O3 crystals was systematically investigated. A possible formation mechanism of different alpha-Fe2O3 hierarchical structures was proposed. Good photocatalytic properties were observed for all the hierarchical structures. (c) 2009 Published by Elsevier Inc.

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