Abstract
Under the application of electrical currents, metal nanocrystals inside carbon nanotubes can be bodily transported. We examine experimentally and theoretically how an iron nanocrystal can pass through a constriction in the carbon nanotube with a smaller cross-sectional area than the nanocrystal itself. Remarkably, through in situ transmission electron imaging and diffraction, we find that, while passing through a constriction, the nanocrystal remains largely solid and crystalline and the carbon nanotube is unaffected. We account for this behavior by a pattern of iron atom motion and rearrangement on the surface of the nanocrystal. The nanocrystal motion can be described with a model whose parameters are nearly independent of the nanocrystal length, area, temperature, and electromigration force magnitude. We predict that metal nanocrystals can move through complex geometries and constrictions, with implications for both nanomechanics and tunable synthesis of metal nanoparticles.
- Received 21 February 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.185901
© 2013 American Physical Society
Synopsis
Crystals Reform to Squeeze through Nanotubes
Published 29 April 2013
Nanoscale crystals pass through narrow constrictions in carbon nanotubes by shuttling atoms from their back end to their front end, according to new experiments.
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