Spontaneous formation of hollow nanoparticles at room temperature: our recent work published in Nanoscale

Hollow Co NPIn a paper recently published in Nanoscale, our group continues the exploration of the Kirkendall effect a room temperature: this time we report on the oxidation of cobalt nanoparticles at the air/water interface. We find that this results in the formation of hollow cobalt oxide shells, followed by decomposition of the shells into much smaller nanoparticles.

The work, carried out together with collaborators at ICMAB led by Prof. Jordi Arbiol, indicates that the presence of water modifies the reactivity on the nanoparticle surface favoring the formation of the hollow structure. The paper also presents detailed characterization, including the magnetic properties of some of the products. Overall, the work contributes to the understanding and control of the chemistry of hollow nanoparticles – a topic of growing interest due to their potential applications.

Varón, M., Ojea-Jimenez, I., Arbiol, J., Balcells, L., Martínez, B., & Puntes, V. F. Spontaneous formation of hollow cobalt oxide nanoparticles by the Kirkendall effect at room temperature at the water–air interface. Nanoscale, 5(6), 2429–2436 (2013).


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