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TitleEffect of surfactant concentration and aggregation on the growth kinetics of nickel nanoparticles
Publication TypeJournal Article
Year of Publication2013
AuthorsLagrow, A.P., Ingham B., Toney M.F., and Tilley R.D.
JournalJournal of Physical Chemistry C
Pagination16709 - 16718
Date Published2013
ISSN19327447 (ISSN)
KeywordsAgglomeration, Aggregates, Critical concentration, In-situ synchrotrons, Nanoparticles, Nickel, Nickel nanoparticles, Nickel particles, Nucleating agents, Particle size analysis, Surfactant concentrations, Trioctylphosphines, Two-step nucleation
AbstractThe effect of trioctylphosphine (TOP) concentration on the growth of nickel nanoparticles is studied using in situ synchrotron small-angle X-ray scattering. The growth kinetics are fitted using a two-step nucleation and autocatalytic growth model. TOP acts as a nucleating agent and then acts as an inhibitor against rapid particle growth. Increasing the TOP concentration results in smaller nanoparticles. Once there is a critical concentration of nickel particles above a certain size, they start to aggregate. This results in a broadening of the particle size distribution at later times due to particles on the outside of the aggregates continuing to grow, while those on the inside cease to grow as the nickel precursor is locally depleted. © 2013 American Chemical Society.

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