You are here

Direct Observation of Aggregative Nanoparticle Growth: Kinetic Modeling of the Size Distribution and Growth Rate

TitleDirect Observation of Aggregative Nanoparticle Growth: Kinetic Modeling of the Size Distribution and Growth Rate
Publication TypeJournal Article
Year of Publication2014
AuthorsWoehl, TJ, Park, C, Evans, JW, Arslan, I, Ristenpart, WD, Browning, ND
JournalNano Letters
Volume14
Pagination373-378
Date Published01
Type of ArticleArticle
ISBN Number1530-6984
Accession NumberWOS:000329586700059
Keywordsaggregation, diffusion, gold nanoparticles, growth mechanism, In situ TEM, in-situ, liquid, liquid cell TEM, nanocrystal growth, nanoparticle, nanoparticle synthesis, phase, shape, silver nanoparticles, transmission electron-microscopy, visualization
Abstract

growth mechanisms, such as aggregation and coalescence, on the growth and final morphology of nanocrystals at the atomic and single nanoparticle scales. To date, groups have quantitatively interpreted the mean growth rate of nanoparticles in terms of the Lifshitz-Slyozov-Wagner (LSW) model for Ostwald ripening, but less attention has been paid to modeling the corresponding particle size distribution. Here we use in situ fluid stage scanning TEM to demonstrate that silver nanoparticles grow by a length-scale dependent mechanism, where individual nanoparticles grow by monomer attachment but ensemble-scale growth is dominated by aggregation. Although our observed mean nanoparticle growth rate is consistent with the LSW model, we show that the corresponding particle size distribution is broader and more symmetric than predicted by LSW. Following direct observations of aggregation, we interpret the ensemble-scale growth using Smoluchowski kinetics and demonstrate that the Smoluchowski model quantitatively captures the mean growth rate and particle size distribution.

DOI10.1021/nl4043328
Custom 1

Not AL funded