Size-tuneable synthesis of nickel nanoparticles |
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Authors: | Keith P Donegan Jeffrey F Godsell David J Otway Michael A Morris Saibal Roy Justin D Holmes |
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Institution: | (1) Materials Chemistry & Analysis Group, Department of Chemistry and the Tyndall National Institute, University College Cork, Cork, Ireland;(2) Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland;(3) Microsystems Centre, Tyndall National Institute, Lee Maltings, Cork, Ireland; |
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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. |
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