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Issue 21, 2014
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Crystal polymorphism: dependence of oxygen diffusion through 2D ordered Co nanocrystals

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Abstract

8 nm Co nanoparticles with various crystalline structures called polymorphs were produced using different synthetic procedures, such as using reverse micelles, the thermal decomposition of organometallics approach or the hot injection process. These 8 nm Co nanoparticles differing by their crystalline structures are exposed to oxygen at elevated temperature. The fcc Co polycrystalline nanoparticles produce either Co–CoO yolk–shell or CoO hollow structures whereas amorphous Co nanoparticles produce Co–CoO core–shell nanoparticles. Furthermore, single domains with either hcp or ε crystalline structure behave differently upon oxygen diffusion. Co–CoO nanoparticles were produced from the hcp phase while CoO hollow nanoparticles were the product for ε-phase Co nanocrystals.

Graphical abstract: Crystal polymorphism: dependence of oxygen diffusion through 2D ordered Co nanocrystals

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Publication details

The article was received on 04 Nov 2013, accepted on 16 Dec 2013 and first published on 18 Dec 2013


Article type: Communication
DOI: 10.1039/C3CP54656J
Phys. Chem. Chem. Phys., 2014,16, 9791-9796

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    Crystal polymorphism: dependence of oxygen diffusion through 2D ordered Co nanocrystals

    Z. Yang, J. Yang, J. Bergström, K. Khazen and M. Pileni, Phys. Chem. Chem. Phys., 2014, 16, 9791
    DOI: 10.1039/C3CP54656J

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