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Issue 6, 2011
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Controlled growth of core@shell heterostructures based on Prussian blue analogues

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Abstract

This work aims to develop a controlled strategy for the growth of multifunctional core@shell nanoparticles based on Prussian blue analogues. We mainly focussed our attention on Rb0.45Co[Fe(CN)6]0.8·3H2O@Rb0.2Ni[Cr(CN)6]0.7·zH2O particles, which combine a photoswitchable (photo-magnetic/-chromic) core with a ferromagnetic shell. The control of the chemical composition in the heterostructure is a key point to obtain the expected magnetic, optical and structural properties. We found that the removal of the unreacted species by washing after the growth of the primary particles led to an irreversible aggregation attributed to the desorption of stabilizing [Fe(CN)6] surface units. We showed that this difficulty could be overcome by washing the particles in a solution containing chromicyanide ions, which are precursors of the Rb0.2Ni[Cr(CN)6]0.7·zH2O shell phase, thus avoiding a contamination of the shell. Both X-ray diffraction and magnetic measurements confirmed that a controlled shell of the desired composition could be obtained this way.

Graphical abstract: Controlled growth of core@shell heterostructures based on Prussian blue analogues

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Publication details

The article was received on 01 Nov 2010, accepted on 16 Dec 2010 and first published on 17 Jan 2011


Article type: Paper
DOI: 10.1039/C0NJ00857E
Citation: New J. Chem., 2011,35, 1296-1301
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    Controlled growth of core@shell heterostructures based on Prussian blue analogues

    M. Presle, J. Lemainque, J.-M. Guigner, E. Larquet, I. Maurin, J.-P. Boilot and T. Gacoin, New J. Chem., 2011, 35, 1296
    DOI: 10.1039/C0NJ00857E

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