Please use this identifier to cite or link to this item: doi:10.22028/D291-29260
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Title: Dynamics of gold nanoparticle clusters observed with liquid-phase electron microscopy
Author(s): Cepeda-Pérez, Elisa
de Jonge, Niels
Language: English
Title: Micron
Volume: 117
Startpage: 68
Endpage: 75
Publisher/Platform: Elsevier
Year of Publication: 2019
Publikation type: Journal Article
Abstract: The dynamics of processes of nanoparticles such as diffusion, attraction and repulsion, and self-assembly of structures of nanoparticles at the solid-liquid interfaces differ significantly from those occurring for bulk conditions and their fundamental physical rules are still unknown. Here, we used liquid phase scanning transmission electron microscopy (LP-STEM) to study several aspects of nanoparticle dynamics of colloidal chitosan coated gold nanoparticle (TCHIT-AuNP) clusters in a liquid layer enclosed between two SiN membranes. We found that upon beam irradiation using an electron flux of 0.9 e-/sÅ2, the AuNPs assembled in clusters that shifted and rotated with time. The newly formed clusters could join and form larger clusters via a mechanism of oriented attachment. By increasing the electron flux to 6.2 e-/sÅ2, we observed the fragmentation of some of the clusters and TCHIT-AuNPs were exchanged between clusters. At the highest electron flux studied 25 e-/sÅ2, we observed AuNPs moving at a very slow speed compared to Brownian motion in liquid even though they were not directly attached or pinned to the liquid-enclosing membrane. Experiments using branched polyethylenimine (BPEI) coated AuNPs were carried out for comparison.
DOI of the first publication: 10.1016/j.micron.2018.11.006
Link to this record: hdl:20.500.11880/28072
ISSN: 0968-4328
Date of registration: 14-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Keiner Professur zugeordnet
Collections:Die Universitätsbibliographie

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