Green electrochemical template synthesis of CoPt nanoparticles with tunable size, composition, and magnetism from microemulsions using an ionic liquid (bmimPF6)
Serrà, Albert (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)
Gomez, Elvira (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)
López-Barbera, José Francisco (Institut Català de Nanociència i Nanotecnologia)
Nogués, Josep (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)
Vallés, Elisa (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)

Fecha:	2014
Resumen:	Electrodeposition from microemulsions using ionic liquids is revealed as a green method for synthesizing magnetic alloyed nanoparticles, avoiding the use of aggressive reducing agents. Microemulsions containing droplets of aqueous solution (electrolytic solution containing Pt(IV) and Co(II) ions) in an ionic liquid (bmimPF) define nanoreactors in which the electrochemical reduction takes place. Highly crystalline hcp alloyed CoPt nanoparticles, in the 10-120 nm range with a rather narrow size distribution, have been deposited on a conductive substrate. The relative amount of aqueous solution to ionic liquid determines the size of the nanoreactors, which serve as nanotemplates for the growth of the nanoparticles and hence determine their size and distribution. Further, the stoichiometry (PtCo) of the particles can be tuned by the composition of the electrolytic solution inside the droplets. The control of the size and composition of the particles allows tailoring the room-temperature magnetic behavior of the nanoparticles from superparaparamagnetic to hard magnetic (with a coercivity of H = 4100 Oe) in the as-obtained state. © 2014 American Chemical Society.
Ayudas:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1292 Ministerio de Economía y Competitividad CQT2010-20726 Ministerio de Economía y Competitividad MAT2010-20616-C02
Nota:	Altres ajuts: Substrates have been prepared in IMB-CNM (CSIC),supported by the (CSIC) NGG-258 project.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Publicado en:	ACS nano, Vol. 8, Issue 5 (May 2014) , p. 4630-4639, ISSN 1936-086X

DOI: 10.1021/nn500367q

Preprint 24 p, 893.3 KB

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