Hexagonal spiral growth in the absence of a substrate

Experiments on the formation of spiraling hexagons (350 - 1000 nm in width) from a solution of nanoparticles are presented. Transmission electron microscopy images of the reaction products of chemically synthesized cadmium nanocrystals indicate that the birth of the hexagons proceeds without assista...

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Bibliographic Details
Published in:arXiv.org 2008-01
Main Author: Adams, Laura L A
Format: Article
Language:English
Subjects:
Chemical synthesis
Crystal surfaces
Dislocation density
Hexagons
Image transmission
Nanocrystals
Nanoparticles
Organic chemistry
Reaction products
Substrates
Transmission electron microscopy
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Summary:Experiments on the formation of spiraling hexagons (350 - 1000 nm in width) from a solution of nanoparticles are presented. Transmission electron microscopy images of the reaction products of chemically synthesized cadmium nanocrystals indicate that the birth of the hexagons proceeds without assistance from static screw or edge dislocatons, that is, they spiral without constraints provided by an underlying substrate. Instead, the apparent growth mechanism relies on what we believe is a dynamical dislocation identified as a dense aggregate of small nanocrystals that straddles the spiraling hexagon at the crystal surface. This nanocrystal bundle, which we term the "feeder", also appears to release nanocrystals into the spiral during the growth process.
ISSN:2331-8422
DOI:10.48550/arxiv.0801.3566