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

Miriam Varón, Isaac Ojea-Jimenez, Jordi Arbiol, Lluis Balcells, Benjamín Martínez, Víctor F. Puntes

    Research output: Contribution to journalArticleResearchpeer-review

    28 Citations (Scopus)

    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. © 2013 The Royal Society of Chemistry.
    Original languageEnglish
    Pages (from-to)2429-2436
    JournalNanoscale
    Volume5
    Issue number6
    DOIs
    Publication statusPublished - 21 Mar 2013

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