Effect of phosphate on the morphology of hydrothermally synthesised β-FeOOH and α-Fe2O3 nanoparticles

Almeida, T. , Fay, M., Zhu, Y. and Brown, P.D. (2010) Effect of phosphate on the morphology of hydrothermally synthesised β-FeOOH and α-Fe2O3 nanoparticles. Journal of Physics: Conference Series, 241(1), 012045. (doi:10.1088/1742-6596/241/1/012045)

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Abstract

β-FeOOH and α-Fe2O3 nanoparticles have been grown from an FeCl3 solution precursor in the presence of an ammonium dihydrogen phosphate surfactant through the process of hydrothermal synthesis. β-FeOOH production varied from small, rounded nanoparticles (~ 45 nm) to larger nanorods (~ 120 nm in length) depending on the stage of synthesis at which the surfactant was added. Larger α-Fe2O3 nanorods (~ 70 nm wide and ~ 450 nm in length) were synthesised from a β-FeOOH suspension at 200°C upon phosphate addition prior to initial β-FeOOH precipitation. The anisotropic growth of α-Fe2O3 was associated with the preferential adsorption of PO43− anions onto α-Fe2O3 crystal planes parallel to the c-axis. Phosphate addition to the suspension subsequent to the initial β-FeOOH precipitation inhibited the phase transformation to α-Fe2O3 at 200°C and assisted with increasing the β-FeOOH particle size.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Almeida, Dr Trevor
Authors: Almeida, T., Fay, M., Zhu, Y., and Brown, P.D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics: Conference Series
Publisher:Institute of Physics Publishing Ltd.
ISSN:1742-6596
ISSN (Online):1742-6596

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