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Published in:
01-02-2008 | Brief Communication
Bar-shaped nanoparticles of iron(II) hydroxide
Published in: Journal of Nanoparticle Research | Issue 2/2008
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Abstract
Formation of elongated nanoparticles was observed when \(\hbox{Fe}_{3}\hbox{O}_{4}\) was precipitated from solutions containing excess of Fe2+. The average diameter of the particles was 23 nm; the length to diameter ratio was up to 14. This shape was an unexpected phenomenon because bar- or needle-like nanoparticles have been earlier reported only for Fe(III)-based materials. Chemical analysis revealed Fe(OH)2 nature of the obtained particles. In addition, this conclusion was verified with a new simple method for quantitative evaluation of the particle morphology. Application of this method to the mixed \(\hbox{Fe(OH)}_{2}/\hbox{Fe}_{3}\hbox{O}_{4}\) samples allowed to distinguish between the two different compounds and to attribute different morphologies to Fe(OH)2 or \(\hbox{Fe}_{3}\hbox{O}_{4}.\) Results indicate that bars are frequent shapes of nano-sized iron oxides/hydroxides.