Title
Self-assembly of gas-phase synthesized magnesium nanoparticles on room temperature substratesSelf-assembly of gas-phase synthesized magnesium nanoparticles on room temperature substrates
Author
Faculty/Department
Faculty of Applied Economics
Faculty of Sciences. Physics
Research group
Engineering Management
Electron microscopy for materials research (EMAT)
Publication type
article
Publication
Bristol :IOP Publishing,
Subject
Physics
Source (journal)
Materials research express. - Bristol, 2014, currens
Volume/pages
2(2015):1, p. 1-10
ISSN
2053-1591
2053-1591
Article Reference
015007
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Magnesium nanoparticles (NPs) with initial size in the 10-50 nmrange were synthesized by inert gas condensation under helium flow and deposited on room temperature substrates. The morphology and crystal structure of the NPs ensemble were investigated as a function of the deposition time by complementary electron microscopy techniques, including high resolution imaging and chemical mapping. With increasing amount of material, strong coarsening phenomena were observed at room temperature: small NPs disappeared while large faceted NPs developed, leading to a 5-fold increase of the average NPs size within a few minutes. The extent of coarsening and the final morphology depended also on the nature of the substrate. Furthermore, large single-crystal NPs were seen to arise from the self-organization of primary NPs units, providing a mechanism for crystal growth. The dynamics of the self-assembly process involves the basic steps of NPs sticking, diffusion on substrate, coordinated rotation and attachment/coalescence. Key features are the surface energy anisotropy, reflected by the faceted shape of the NPs, and the low melting point of the material. The observed phenomena have strong implications in relation to the synthesis and stability of nanostructures based on Mg or other elements with similar features.
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