Abstract
Polyhedron-shaped hematite (α-Fe2O3) nanoparticles have been successfully synthesized via a facile hydrothermal method by mixing FeCl3 and NH4OH at high temperature. In this work, the influences of experimental conditions such as the effects of the concentration of iron’s ion, NH4OH concentration, and reaction temperature on the hematite’s particle size, dispersity, and growth rate were investigated. Results show that hematite nanoparticles with good crystallinity with the particle size of 100 nm could be obtained when the hydrothermal reaction was carried out with concentration of Fe3+ = 16 mM, NH4OH = 40 mM, reaction temperature = 120 °C, and reaction time = 24 h. In addition, this study investigates the hematite nanoparticle-formation mechanism with reaction time. It is observed that the formation of hematite nanoparticles are initiated by the formation of intermediate phase of goethite nanorods in the early stage of hydrothermal reaction, which further transform into hematite crystal as the reaction is progressed.
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Acknowledgments
The authors gratefully acknowledge the support of the Department of Energy through the National Energy Technology Laboratory under contract number DE-FE0005979. The authors appreciate the aid of Liz Bustamante for her assistance in language editing this manuscript.
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Khalil, M., Yu, J., Liu, N. et al. Hydrothermal synthesis, characterization, and growth mechanism of hematite nanoparticles. J Nanopart Res 16, 2362 (2014). https://doi.org/10.1007/s11051-014-2362-x
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DOI: https://doi.org/10.1007/s11051-014-2362-x