Size-tuneable synthesis of nickel nanoparticles
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Accepted version
Date
2012-01-11
Authors
Donegan, Keith P.
Godsell, Jeffrey F.
Otway, David J.
Morris, Michael A.
Roy, Saibal
Holmes, Justin D.
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Verlag
Published Version
Abstract
A facile method is described for synthesising nickel nanoparticles via the thermal decomposition of an organometallic precursor in the presence of excess n-trioctylphosphine as a capping ligand. For the first time, alkylamines with different chain lengths were employed as size-limiting agents in this synthesis. A direct correlation is demonstrated between the size of the alkylamine ligands used and the mean diameter of the nickel nanoparticles obtained. The use of bulky oleylamine as a size-limiting agent over a reaction period of 30 min led to the growth of nickel nanoparticles with a mean diameter of 2.8 ± 0.9 nm. The employment of less bulky N,N-dimethylhexadecylamine groups led to the growth of nickel nanoparticles with a mean diameter of 4.4 ± 0.9 nm. By increasing the reaction time from 30 to 240 min, while employing oleylamine as the size-limiting agent, the mean diameter of the nickel nanoparticles was increased from 2.8 ± 0.9 to 5.1 ± 0.7 nm. Decreasing the amount of capping ligand present in the reaction system allowed further growth of the nickel nanoparticles to 17.8 ± 1.3 nm. The size, structure and morphology of the nanoparticles synthesised were characterised by transmission electron microscopy and powder X-ray diffraction; while magnetic measurements indicated that the particles were superparamagnetic in nature.
Description
Keywords
Nickel , Nanoparticles , Decomposition , Alkylamine , Diameter control , Superparamagnetic
Citation
Donegan, K. P., Godsell, J. F., Otway, D. J., Morris, M. A., Roy, S. and Holmes, J. D. (2012) 'Size-tuneable synthesis of nickel nanoparticles', Journal of Nanoparticle Research, 14(1), 670 (10 pp). doi: 10.1007/s11051-011-0670-y
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Copyright
© Springer Science+Business Media B.V. 2012. This is a post-peer-review, pre-copyedit version of an article published in Journal of Nanoparticle Research. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11051-011-0670-y