Journal
CRYSTENGCOMM
Volume 12, Issue 2, Pages 373-382Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b910550f
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Funding
- Defence Research and Development Organisation, Government of India
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Single-crystalline, nanostructured dendrites, single and double-layered snowflakes of hematite (alpha-Fe2O3) were synthesized by a well controlled, surfactant-assisted hydrothermal reaction of K-3[Fe(CN)(6)]. By varying the preparatory conditions such as precursor concentration and type of surfactant, we could establish precise control on the morphology of the sample. X-Ray diffraction, Raman analysis and X-ray photoelectron spectroscopic studies have confirmed that the as grown morphologies were hematite. Dendrites were obtained due to weak dissociation of the precursor and controlled diffusion of alpha-Fe2O3 nanoparticles under non-equilibrium conditions which attach and grow along certain preferred crystal facets. In the presence of a surfactant, single and double-layered snowflakes were formed. The type of surfactant and the nature of micelle formation were proposed to be the key factor for the observed snowflakes and the single or double-layered growth. Magnetic studies have shown morphology dependent magnetic properties with variation in the coercivity values for dendrites, single and double-layered snowflakes.
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