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Issue 6, 2013
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Spontaneous formation of hollow cobalt oxide nanoparticles by the Kirkendall effect at room temperature at the water–air interface

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Abstract

We observe the spontaneous formation of hollow cobalt oxide nanoparticles at room temperature, indicating an enhancement of the solid-state diffusion at the nanoscale. Single crystal cobalt nanoparticles covered by a hydrophobic organic layer were transformed spontaneously into CoO hollow nanoparticles when deposited on the water–air interface in a matter of a few hours. The presence of water modifies the reactivity on the nanoparticle surface favoring the formation of the hollow structure; otherwise Co–CoO core–shell nanoparticles are obtained. The CoO hollow nanoparticles are formed only in an intermediate state, and after a period of time these structures finally undergo disintegration to form minor CoO entities.

Graphical abstract: Spontaneous formation of hollow cobalt oxide nanoparticles by the Kirkendall effect at room temperature at the water–air interface

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Article information


Submitted
07 Sep 2012
Accepted
01 Dec 2012
First published
07 Jan 2013

Nanoscale, 2013,5, 2429-2436
Article type
Paper

Spontaneous formation of hollow cobalt oxide nanoparticles by the Kirkendall effect at room temperature at the water–air interface

M. Varón, I. Ojea-Jimenez, J. Arbiol, L. Balcells, B. Martínez and V. F. Puntes, Nanoscale, 2013, 5, 2429
DOI: 10.1039/C2NR32657D

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