Controlling role of pH and temperature on CoFe2O4 nanostructures produced by hydrothermal synthesis

Almeida, T. P. , Fay, M., Zhu, Y. and Brown, P. D. (2012) Controlling role of pH and temperature on CoFe2O4 nanostructures produced by hydrothermal synthesis. Journal of Nanoscience and Nanotechnology, 12(11), pp. 8801-8805. (doi:10.1166/jnn.2012.6468) (PMID:23421290)

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Abstract

The hydrothermal synthesis (HS) of CoFe2O4 nanoparticles (NPs) has been investigated as a function of reaction temperature and pH, using complementary characterisation techniques of transmission electron microscopy and X-ray diffractometry. The HS of CoFe2O4 NPs (<25 nm) at pH ∼ 8 proceeded through the formation and dissolution of intermediate Fe(OH)3 and [FeCo3(OH)8]+·[Cl−·H2O]− phases with increasing reaction temperature. In contrast, HS of CoFe2O4 NPs (<50 nm) at pH ∼ 12 resulted in the formation of additional intermediate Co(OH)2, CoOOH and α-FeOOH phases, with residual α-Fe2O3 present in the final reaction product. This research demonstrates the size and phase purity of the CoFe2O4 NPs may be controlled through the formation and dissolution of the intermediate phases at various pH values in the alkaline pH regime.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Almeida, Dr Trevor
Authors: Almeida, T. P., Fay, M., Zhu, Y., and Brown, P. D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Nanoscience and Nanotechnology
Publisher:American Scientific Publishers
ISSN:1533-4880
ISSN (Online):1533-4899

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