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TitleHow nanoparticles coalesce: An in situ study of Au nanoparticle aggregation and grain growth
Publication TypeJournal Article
Year of Publication2011
AuthorsIngham, B., Lim T.H., Dotzler C.J., Henning A., Toney M.F., and Tilley R.D.
JournalChemistry of Materials
Pagination3312 - 3317
Date Published2011
ISSN08974756 (ISSN)
KeywordsAgglomeration, Au nanoparticle, Capping ligands, Coalescence, Device fabrications, Diffraction, Gold, Gold Nanoparticles, Grain growth, Grain growth process, Grain size and shape, In-Situ Study, Metal nanocrystals, Nanocrystals, Nanoparticles, Particle aggregation, Real time, Scattering, Small-angle X-ray scattering, Stacking fault density, Surface active agents, Surfactant-stabilized, Synchrotron x ray diffraction, Time-scales, X ray diffraction, X ray scattering
AbstractThe processes of aggregation and subsequent grain growth of highly twinned, surfactant stabilized gold nanoparticles have been followed in real time using synchrotron X-ray diffraction (XRD) and small-angle X-ray scattering (SAXS). This gives insight into the overall coalescence mechanism of metal nanocrystals. First, the capping ligands melt or desorb, which enables the nanocrystals to aggregate and join together. At longer times, grain growth is observed, and the stacking fault densities decrease. The time scale of the grain growth process is significantly longer than that of the particle aggregation. We contrast the behavior we observe to that of other nanoparticles and discuss the implications of our results on device fabrication. © 2011 American Chemical Society.

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