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The Mechanisms for Nanoparticle Surface Diffusion and Chain Self-Assembly Determined from Real-Time Nanoscale Kinetics in Liquid

TitleThe Mechanisms for Nanoparticle Surface Diffusion and Chain Self-Assembly Determined from Real-Time Nanoscale Kinetics in Liquid
Publication TypeJournal Article
Year of Publication2015
AuthorsWoehl, TJ, Prozorov, T
JournalJournal of Physical Chemistry C
Volume119
Pagination21261-21269
Date Published09
Type of ArticleArticle
ISBN Number1932-7447
Accession NumberWOS:000361255100054
Keywordsaggregation, capacity anode material, charged gold nanoparticles, crystal-growth, ion batteries, langmuir-blodgett-films, nanocrystal growth, oriented attachment, transmission electron-microscopy, water
Abstract

erived from liquid cell transmission electron microscopy investigation of nanoparticle self-assembly to show that nanoparticle mobility dictates the pathway for self-assembly and final nanostructure morphology. We describe a new method for modulating nanoparticle diffusion in a liquid cell, which we employ to systematically investigate the effect of mobility on self-assembly of nanoparticles. We interpret the observed diffusion in terms of electrostatically induced surface diffusion resulting from nanoparticle hopping on the liquid cell window surface. Slow-moving nanoparticles self-assemble predominantly into linear ID chains by sequential attachment of nanoparticles to existing chains, while highly mobile nanoparticles self-assemble into chains and branched structures by chain chain attachments. Self-assembly kinetics are consistent with a diffusion-driven mechanism; we attribute the change in self-assembly pathway to the increased self-assembly rate of highly mobile nanoparticles. These results indicate that nanoparticle mobility can dictate the self-assembly mechanism and final nanostructure morphology in a manner similar to interparticle interactions.

DOI10.1021/acs.jpcc.5b07164
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